Information processing device, information processing system, droplet scattering determination method, and information processing program

Abstract

To provide an information processing device, an information processing system, a droplet scattering determination method, and an information processing program capable of determining whether droplets have been scattered from liquid, and outputting the determination.SOLUTION: An information processing device 10 includes: an image acquisition unit 68 which acquires an image of a liquid jet injected from a liquid surface of a liquid from an imaging apparatus; a droplet scattering determination unit 74 which determines that the droplets are scattered from the liquid when the liquid jet in the image acquired by the image acquisition unit 68 is fragmented, and that the droplets are not scattered from the liquid when the liquid jet in the image is not fragmented; and an output unit 78 which outputs the determination result of the droplet scattering determined by the droplet scattering determination unit 74.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an information processing device, an information processing system, a droplet scattering determination method, and an information processing program. [Background technology]

[0002] Conventionally, various liquids are used for various purposes. For example, in industrial processes, water and oil are used in the quenching process in which a metal heated to a high temperature is rapidly cooled. Also, for example, in the metal cutting process, cutting oil is used for lubrication, cooling, and cleaning of cutting chips. Furthermore, high-temperature oil and chemicals are sometimes used at home and in educational institutions. Thus, in various sites, droplets from the liquid may scatter and splash around, causing a risk of affecting workers and the environment.

[0003] As a countermeasure against the scattering of droplets, a method of physically dividing the space by installing a protective wall or the like is known. However, there is room for improvement in terms of protecting workers and the environment simply and safely. Therefore, it is preferable to suppress the scattering of droplets itself by adjusting the physical properties of the liquid. Summary of the Invention [Problem to be solved by the invention]

[0004] However, when selecting a liquid capable of suppressing scattering of droplets, it is not easy to visually determine whether or not droplets have scattered from the liquid.

[0005] In consideration of the above, an object of the present invention is to provide an information processing device, an information processing system, a droplet scattering determination method, and an information processing program that can determine and output whether or not droplets have scattered from a liquid. [Means for solving the problem]

[0006] The information processing device of claim 1 has an image acquisition unit that acquires an image of a liquid jet ejected from a liquid surface from an imaging device, a droplet scattering determination unit that determines that droplets have been scattered from the liquid if the liquid jet in the image acquired by the image acquisition unit is interrupted and determines that droplets have not been scattered from the liquid if the liquid jet in the image is not interrupted, and an output unit that outputs the determination result of droplet scattering determined by the droplet scattering determination unit.

[0007] According to the present invention as set forth in claim 1, an image of a liquid jet ejected from a liquid surface is acquired from an image acquisition unit by an image capture device. Here, if the liquid jet in the image acquired by the image acquisition unit is interrupted, the droplet scattering determination unit determines that droplets have been scattered from the liquid. On the other hand, if the liquid jet in the image is not interrupted, the droplet scattering determination unit determines that droplets have not been scattered from the liquid. The result of droplet scattering determined by the droplet scattering determination unit is output by an output unit.

[0008] The information processing device of claim 2 is the invention described in claim 1, further comprising a contour detection unit that detects the contour of the liquid jet from the image, and the droplet scattering determination unit determines that droplets have been scattered from the liquid when the contour of the liquid jet is interrupted, and determines that droplets have not been scattered from the liquid when the contour of the liquid jet is not interrupted.

[0009] According to the present invention as set forth in claim 2, the contour of the liquid jet is detected by the contour detection unit. Here, if the detected contour of the liquid jet is divided, the droplet scattering determination unit determines that droplets have been scattered from the liquid. On the other hand, if the detected contour of the liquid jet is not divided, the droplet scattering determination unit determines that droplets have not been scattered from the liquid. Therefore, the presence or absence of droplet scattering can be determined with high accuracy based on the detected contour of the liquid jet.

[0010] According to a third aspect of the present invention, in the information processing device according to the first aspect, the output unit displays the determination result on a display device.

[0011] According to the present invention as set forth in claim 3, the determination result of the presence or absence of droplet scattering is output by the output unit to the display device, thereby enabling the user of the information processing device to visually grasp the determination result.

[0012] The information processing device according to claim 4 is the invention described in claim 3, further comprising: s [N·s / m 2 ], relaxation time λ[s], density ρ[kg / m 3 the liquid jet ejection device ejects the liquid jet, and an initial velocity U0 [m / s] imparted to the liquid by the liquid jet ejection device; and a calculation unit that calculates a Reynolds number Re of the liquid jet, represented by the following equation 1, and a Weissenberg number Wi of the liquid jet, represented by the following equation 2, based on the conditions acquired by the condition acquisition unit, and the output unit displays on the display device a graph showing the relationship between the Reynolds number Re and the Weissenberg number Wi, together with a plot of the values ​​calculated by the calculation unit, a scattering estimation region where it is estimated that droplets will scatter, a scattering suppression estimation region where it is estimated that droplets will not scatter, and

[0013]

number

[0014]

number

[0015] According to the present invention as set forth in claim 4, the condition acquisition unit acquires the shear viscosity μ s [N·s / m 2 ], relaxation time of the liquid λ [s], density of the liquid ρ [kg / m 3], the inner radius r [m] of the pipe of the liquid jet ejection device that ejects the liquid jet, and the initial velocity U0 [m / s] that the liquid jet ejection device imparts to the liquid are obtained.

[0016] Furthermore, the Reynolds number Re and the Weissenberg number Wi of the liquid jet are calculated by the calculation unit based on the conditions acquired by the condition acquisition unit. Then, in a graph showing the relationship between the Reynolds number Re and the Weissenberg number Wi, a plot of the calculated values, an estimated scattering region where droplets are estimated to scatter, and an estimated scattering suppression region where droplets are estimated not to scatter are displayed on the display device.

[0017] This allows a user of the information processing device to visually understand whether the plot of the values ​​calculated from the acquired conditions belongs to the estimated scattering region or the estimated scattering suppression region, along with the determination result of whether or not droplet scattering has occurred.

[0018] In addition, the user can visually grasp how far the acquired conditions are from the boundary between the estimated scattering region and the estimated scattering suppression region. Therefore, for example, even if it is determined that droplets are not scattering under a certain condition, if the plot of the value calculated from the condition belongs to the estimated scattering region, or is located in the estimated scattering suppression region close to the boundary with the estimated scattering region, the user of the information processing device can know that the conditions are such that droplets may scatter. In other words, the user of the droplet scattering device can grasp the ease (or difficulty) of droplet scattering under the certain condition together with the determination result of whether or not droplets have actually been scattered. This allows the user of the information processing device to easily select a liquid that can suppress droplet scattering.

[0019] According to a fifth aspect of the present invention, there is provided an information processing device according to the fourth aspect, wherein the output section displays, on the display device, a region that satisfies Re≧250 and Wi≦0.043Re as the estimated scattering region.

[0020] According to the present invention as defined in claim 5, the output unit displays on the display device a region that satisfies Re≧250 and Wi≦0.043Re as the estimated scattering region.

[0021] Here, when the Reynolds number Re calculated by the calculation unit is 250 or more, the plot of the calculated value belongs to the estimated scattering region. s [N·s / m 2 ] and density ρ [kg / m 3 If [ ] is small, it is assumed that liquid will splash and the estimated splash area is displayed.

[0022] In addition, when the Weisenberg number Wi calculated by the calculation unit is 0.043 Re or less, the plot of the calculated value belongs to the estimated scattering region. In other words, when the relaxation time λ [s] of the liquid is long, that is, when the elasticity of the liquid is small, the droplets are assumed to scatter, and the estimated scattering region is displayed.

[0023] The information processing system of claim 6 comprises a liquid jet emitting device that emits a liquid jet from a liquid surface, an imaging device that captures an image of the liquid jet emitted by the liquid jet emitting device, and an information processing device according to any one of claims 1 to 5 that acquires the image from the imaging device, determines whether or not droplets have scattered based on the image, and outputs the determination result.

[0024] According to the present invention as set forth in claim 6, a liquid jet is ejected from a liquid surface by the liquid jet ejecting device, and an image of the ejected liquid jet is captured by the imaging device.

[0025] Furthermore, an image of the liquid jet ejected from the liquid surface is acquired from the photographing device by an image acquisition unit of the information processing device. Here, if the liquid jet in the image acquired by the image acquisition unit is interrupted, a droplet scattering determination unit of the information processing device determines that droplets have been scattered from the liquid. On the other hand, if the liquid jet in the image is not interrupted, the droplet scattering determination unit determines that droplets have not been scattered from the liquid. The determination result of droplet scattering determined by the droplet scattering determination unit is output by an output unit of the information processing device.

[0026] A droplet scattering determination method according to claim 7 acquires an image of a liquid jet ejected from a liquid surface from an imaging device, determines that droplets have been scattered from the liquid if the liquid jet in the acquired image is interrupted, and determines that droplets have not been scattered from the liquid if the liquid jet in the image is not interrupted, and outputs a result of the determined droplet scattering.

[0027] According to the present invention as set forth in claim 7, an image of a liquid jet ejected from a liquid surface is acquired by an image capturing device. Here, if the liquid jet in the acquired image is broken up, it is determined that droplets have been scattered from the liquid. On the other hand, if the liquid jet in the image is not broken up, it is determined that droplets have not been scattered from the liquid. The result of the determination of droplet scattering is output.

[0028] The information processing program of claim 8 causes a computer to execute a process of acquiring an image of a liquid jet ejected from a liquid surface from an imaging device, determining that droplets have been scattered from the liquid if the liquid jet in the acquired image is disrupted, determining that droplets have not been scattered from the liquid if the liquid jet in the image is not disrupted, and outputting the result of the determined droplet scattering.

[0029] According to the present invention as set forth in claim 8, an image of a liquid jet ejected from a liquid surface is acquired by an image capturing device. Here, if the liquid jet in the acquired image is broken up, it is determined that droplets have been scattered from the liquid. On the other hand, if the liquid jet in the image is not broken up, it is determined that droplets have not been scattered from the liquid. The result of the determination of droplet scattering is output. Effect of the Invention

[0030] As described above, the information processing device according to the present invention as set forth in claim 1 has the excellent effect of being able to determine and output whether or not droplets have scattered from a liquid.

[0031] The information processing device according to the present invention as set forth in claim 2 has the excellent effect of being able to accurately determine the presence or absence of scattered droplets.

[0032] The information processing device according to the present invention as set forth in claim 3 has an excellent effect of being able to output the determination result in an easily understandable manner.

[0033] The information processing device according to the present invention as set forth in claim 4 has the excellent effect of allowing a user of the device to easily select a liquid capable of suppressing scattering of droplets.

[0034] The information processing device according to the present invention as set forth in claim 5 has the excellent effect of allowing a user of the device to easily select a liquid capable of suppressing scattering of droplets.

[0035] The information processing system according to the present invention as set forth in claim 6 has the excellent effect of being able to determine and output whether or not droplets have scattered from the liquid.

[0036] The method for determining whether or not droplets have been scattered according to the present invention as set forth in claim 7 has the excellent effect of being able to determine and output whether or not droplets have been scattered from a liquid.

[0037] The information processing program according to the present invention as recited in claim 8 has an excellent effect of being able to determine and output whether or not droplets have scattered from the liquid. [Brief description of the drawings]

[0038] [Figure 1] 1 is a schematic diagram of an information processing system including an information processing device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a liquid jet ejection test using the first ejection device shown in FIG. 1. [Diagram 3] FIG. 2 is a schematic diagram of a liquid jet ejection test using the second ejection device shown in FIG. 1. [Figure 4] FIG. 2 is a block diagram showing a hardware configuration of the liquid evaluation device. [Diagram 5] 5 is a block diagram showing a functional configuration of the information processing device shown in FIG. 4. [Figure 6] This is an example of a pinch-off jet, where the tip breaks off after injection and droplets scatter. [Figure 7] This is an example of a No Pinch-off jet, and an example of a Bungee jet that stretches after injection and returns to the initial interface without tearing. [Figure 8] This is another example of No Pinch-off jet, which is an example of no jet returning to the initial interface without stretching after injection. [Figure 9] 5 is a flowchart showing an example of the flow of an injection device selection process executed by the CPU of FIG. 4. [Figure 10] 7 is a flowchart showing an example of the flow of the liquid jet ejection process executed by the CPU of FIG. 4, which is a process following A of FIG. 6. [Figure 11] 7 is a flowchart showing another example of the flow of the liquid jet ejection process executed by the CPU of FIG. 4, which is a process following B of FIG. 6. [Figure 12] 9 is a flowchart showing an example of the flow of a determination process executed by the CPU of FIG. 4, which is a process subsequent to C of FIG. 7 or FIG. 8. [Figure 13] 2 is an example of an image displayed on the display of FIG. 1, showing an example of a case where a pinch-off jet occurs. [Figure 14] 10 is another example of an image displayed on the display of FIG. 1 when a bungee jet occurs. [Figure 15] 1 is a graph showing the shear viscosity versus strain rate of the PEO aqueous solution and the PAM aqueous solution used in the verification experiment. [Figure 16] 1 is a graph showing the change in jet behavior due to the Reynolds number Re and the Weissenberg number Wi in a verification experiment. [Figure 17] 17A and 17B are diagrams showing modeling of a viscoelastic liquid jet, in which Fig. 17A shows the initial state, and Fig. 17B shows the state in which the jet has been extended t seconds after the initial state. [Figure 18] Figure 18(A) is an image taken of a metal ball being dropped into water, and Figure 18(B) is an image taken of a metal ball being dropped into a viscoelastic liquid. [Figure 19] FIG. 19(A) is an example image of splash (splash 1) that occurs during solid-liquid collision, and FIG. 19(B) is an example image of splash (splash 2) that occurs due to the breakage of the Worthington jet after the collision. [Figure 20] Figure 20(A) is a time series of images showing the behavior of a solid sphere when it is dropped into water, and Figure 20(B) is a time series of images showing the behavior of a solid sphere when it is dropped into a viscoelastic liquid. [Figure 21] Fig. 21(A) is a time series of images showing the behavior of a water droplet when it is dropped into water, and Fig. 21(B) is a time series of images showing the behavior of a droplet of a viscoelastic liquid when it is dropped into the viscoelastic liquid. [Figure 22] FIG. 22(A) is an example image of splash (splash 3) that occurs during liquid-liquid collision, and FIG. 22(B) is an example image of splash (splash 4) that occurs due to the breakage of the Worthington jet after the collision. [Diagram 23]Figure 23(A) is a time series of images showing the behavior of a water droplet dropped onto a rotating metal rod, and Figure 23(B) is a time series of images showing the behavior of a viscoelastic liquid dropped onto a rotating metal rod. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] An information processing system S including an information processing device 10 according to one embodiment of the present invention will be described below with reference to FIGS.

[0040] [Information Processing System S] 1, the information processing system S is configured to include various devices inside a housing 12. The housing 12 is formed with an injection port 12A through which a liquid can be injected into the inside of the housing 12. The information processing system S is equipped with a liquid detection device (see FIG. 4) that can detect that a liquid has been injected through the injection port 12A.

[0041] In addition, the information processing system S calculates the shear viscosity μ s [N·s / m 2 ], an extensional rheometer 16 (hereinafter referred to as "CaBER-DoS16") capable of measuring the relaxation time λ [s] of the liquid, and a density ρ [kg / m 3 The device is equipped with a pycnometer 18 capable of measuring the elasticity of a material. The relaxation time λ is a physical property that indicates the magnitude of elasticity. The relaxation time λ is the time it takes for a material to change (relax) from a non-equilibrium state to an equilibrium state when an external force is applied to the material. CaBER-DoS is a method for evaluating the extensional rheology of viscoelastic liquids by measuring the time progression of the neck radius of the liquid (Dinic, J. et al., Lab on a Chip, (2017)).

[0042] Furthermore, the information processing system S includes a display 20 as a display device that can be viewed from the outside. The display 20 is a touch panel that also allows input. Note that the display device does not necessarily have to function as an input device.

[0043] Furthermore, the information processing system S includes a first liquid jet ejection device 22 (hereinafter referred to as the "first ejection device 22") and a second liquid jet ejection device 24 (hereinafter referred to as the "second ejection device 24"). The first ejection device 22 and the second ejection device 24 are configured to eject liquids having a shear viscosity μ measured by a rheometer 14. s The first injection unit 22 and the second injection unit 23 are used in detail and how to use them will be described later.

[0044] The information processing system S also includes a high-speed camera 26 (hereinafter referred to as "camera 26") as an image capturing device that captures an image of the liquid jet ejected from the first ejection device 22 or the second ejection device 24, and a light source 28 that illuminates an object to be captured. The camera 26 is configured to be able to capture an image of the liquid jet ejected by the first ejection device 22 or the second ejection device 24 at a capture speed of, for example, about 10,000 to 60,000 fps.

[0045] Furthermore, the information processing system S includes an information processing device 10. The information processing device 10 has a function of determining whether or not droplets have scattered from the liquid based on a plurality of time-series images captured by the camera 26. This function and other functions of the information processing device 10 will be described in detail later. Note that, although the information processing system S according to the present embodiment has been described as being configured to include various devices inside the housing 12, this is not limiting. For example, various devices including the information processing device may be connected via a network and be capable of communicating with each other.

[0046] [First injection device 22] 2 shows a schematic diagram of a liquid jet injection test using the first injection device 22. The first injection device 22 is used when the viscosity of the liquid is low.

[0047] The first ejection device 22 includes a test tube 30, an electromagnet 32 ​​that detachably holds the test tube 30, a switch (not shown) for the electromagnet 32, and a floor material 34 onto which the test tube 30 is dropped. Although not shown, the first ejection device 22 is also provided with a height adjustment mechanism that is connected to the electromagnet 32 ​​and is configured to be able to adjust the drop height H of the test tube 30.

[0048] As an example, the inner diameter 2r1 of the test tube 30 is 2r1=14.3 mm. Also, as an example, liquid is poured into the test tube 30 up to a height L=32 mm. Note that the inner diameter 2r of the test tube 30 and the liquid height L are not limited to the above. Also, the floor material 34 is made of a metal such as SS400, but is not limited to this. For example, the floor material may be a synthetic rubber such as nitrile rubber.

[0049] The usage mode of the first ejection device 22 will be described. First, a test tube 30 filled with liquid F1 is held by an electromagnet 32. Next, a height adjustment mechanism (not shown) adjusts the drop height H of the test tube 30. At this time, the camera 26 is adjusted to a position where it can capture an image including the upper side of the gas-liquid interface of the dropped test tube 30. In addition, the light source 28 is adjusted to a position facing the camera 26 where it can irradiate an area including the upper side of the gas-liquid interface of the dropped test tube 30.

[0050] Then, by flipping a switch (not shown), the electromagnet 32 ​​stops holding the test tube 30, and the test tube 30 falls freely from the electromagnet 32. During this time, the shape of the gas-liquid interface in the test tube 30 becomes hemispherical due to the surface tension of the liquid.

[0051] When the test tube 30 collides with the floor in this state, the liquid is rapidly accelerated in a short time, and a focused liquid jet is formed from the gas-liquid interface. In other words, the first ejection device 22 ejects a liquid jet from the liquid surface by the impact force generated by the falling collision. The first ejection device 22 is capable of changing the velocity imparted to the test tube 30, i.e., the velocity U0 [m / s] imparted to the liquid F1, by changing the falling height H of the test tube 30.

[0052] [Second injection device 24] 3 shows a schematic diagram of a liquid jet injection test using the second injection device 24. The second injection device 24 is used when the liquid has a high viscosity.

[0053] The second injection device 24 includes a container 36 supported on a stand (not shown), a thin tube 38 disposed inside the container 36, a solenoid 40 that applies an impact force to the container 36, and a syringe pump 42 that increases and decreases the internal air pressure of the container 36. For the thin tube 38, for example, a glass thin tube having an inner diameter 2r2=2 mm is used.

[0054] The usage of the first injection device 22 will be described. First, the thin tube 38 is inserted into a container 36 partially filled with liquid F2, and the container 36 is sealed from the outside of the thin tube 38. Furthermore, the inside of the container 36 from the outside of the thin tube 38 is depressurized by a syringe pump 42 connected to one end of the container 36. This causes the liquid level inside the thin tube 38 to be pushed down toward the bottom of the container, and the distance L between the lower end of the thin tube 38 and the gas-liquid interface inside the thin tube is reduced. cap and the liquid level difference L between the inside and outside of the capillary 38 top is adjusted.

[0055] In this state, the iron core 40A is collided with the bottom of the container 36 by the solenoid 40, applying an impact force vertically upward at a velocity V0. This causes the liquid F2 inside the capillary 38 to rapidly accelerate, and a liquid jet having a focused shape is formed from the gas-liquid interface inside the capillary 38. In other words, the second injection device 24 is configured so that a liquid jet is ejected from the liquid surface inside the capillary 38 by the impact force caused by the collision of the iron core 40A, and the impact velocity V0 of the iron core 40A and the distance L between the bottom end of the capillary 38 and the gas-liquid interface inside the capillary cap and the liquid level difference L between the inside and outside of the capillary 38 top By adjusting this, the speed at which the liquid is applied to the container 36, i.e., the speed U0 [m / s] at which the liquid is applied to the liquid F2, can be changed. The speed at which the first injection device 22 applies the liquid F1 or the speed at which the second injection device 24 applies the liquid F2 is referred to as the "initial speed U0." Hereinafter, when there is no need to distinguish between the liquids, the liquid will be simply referred to as liquid F.

[0056] (Hardware configuration of information processing device 10) 4, the information processing device 10 includes a CPU (Central Processing Unit: processor) 44, a ROM (Read Only Memory) 46, a RAM (Random Access Memory) 48, a storage 50, and an input / output interface (communication I / F) 52. Each component is connected to each other via an internal bus 54 so as to be able to communicate with each other.

[0057] The CPU 44 is a central processing unit that executes various programs and controls each part. That is, the CPU 44 reads a program from the ROM 46 or the storage 50, and executes the program using the RAM 48 as a working area. The CPU 44 also controls each of the above components and performs various arithmetic processing according to the program recorded in the ROM 46 or the storage 50.

[0058] The ROM 46 stores various programs and various data. The RAM 48 temporarily stores programs or data as a working area. The storage 50 is composed of an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and is a non-temporary recording medium that stores various programs including an operating system and various data. In this embodiment, the ROM 46 or the storage 50 stores a phase diagram 80 (see FIG. 13), the inner radius r1 of the test tube 30 (see FIG. 2), the inner radius r2 of the capillary 38 (see FIG. 3), various calculation formulas, and various programs for performing various processes.

[0059] The input / output I / F 52 is electrically connected to a liquid detection device 56, a rheometer 14, a CaBER-DoS 16, a pycnometer 18, a display 20, a first ejection device 22, a second ejection device, a camera 26, and a light source 28.

[0060] (Functional configuration of information processing device 10) The information processing device 10 uses the above hardware resources to realize various functions. The functional configuration realized by the information processing device 10 will be described with reference to FIG.

[0061] The information processing device 10 is configured to include, as functional components, a reception unit 58, a control unit 60, a condition acquisition unit 62, a calculation unit 64, an ejection device determination unit 66, an image acquisition unit 68, a maximally expanded image extraction unit 70, an outline detection unit 72, a droplet scattering determination unit 74, a bungee jet determination unit 76, and an output unit 78. Each functional component is realized by the CPU 44 reading and executing a program stored in the ROM 46 or the storage 50.

[0062] The receiving section 58 has a function of receiving from the liquid-detecting device 56 that the liquid F has been injected through the injection port 12A.

[0063] The control unit 60 has the function of controlling the rheometer 14, the CaBER-DoS 16, the pycnometer 18, the display 20, the camera 26, and the light source 28.

[0064] For example, the control unit 60 controls the rheometer 14 to measure the shear viscosity μ s Here, the control unit 60 measures the viscosity μ when the strain rate γ is from several hundred to several thousand. s is measured by the rheometer 14. This is because when the first injection device 22 is used to generate a liquid jet, the strain rate γ is assumed to be several hundred, and when the second injection device 24 is used to generate a liquid jet, the strain rate γ is assumed to be several thousand.

[0065] The control unit 60 also controls the CaBER-DoS 16 to measure the relaxation time λ. The control unit 60 also controls the pycnometer 18 to measure the density ρ of the liquid. The control unit 60 also controls the display 20 to display an image. The control unit 60 also directs the camera 26 and the light source 28 to the injection device to be used, and adjusts the height of the camera 26 and the light source 28.

[0066] Furthermore, the control unit 60 has a function of controlling the first injection device 22. Specifically, the control unit 60 injects liquid into the test tube 30 of the first injection device 22 up to a height L. The control unit 60 also controls a height adjustment mechanism (not shown) of the first injection device 22 to adjust the drop height H, etc. Furthermore, the control unit 60 switches a switch (not shown) of the first injection device 22 to drop the test tube 30.

[0067] The control unit 60 also has a function of controlling the second injection device 24. Specifically, the control unit 60 controls the syringe pump 42 of the second injection device 24 to adjust the distance L between the lower end of the capillary 38 and the gas-liquid interface inside the capillary. cap and the liquid level difference L between the inside and outside of the capillary 38 top In addition, the control unit 60 controls the solenoid 40 to collide the iron core 40A with the bottom of the container 36.

[0068] Furthermore, the control unit 60 has the function of controlling the camera 26 to start photographing at the timing when it flips a switch (not shown) of the first injection device 22 to drop the test tube 30, or when it controls the solenoid 40 to collide the iron core 40A with the bottom of the container 36.

[0069] The condition acquisition unit 62 has a function of acquiring various conditions necessary for calculating the Reynolds number Re and the Weissenberg number Wi of the liquid. Specifically, the condition acquisition unit 62 acquires the shear viscosity μ s is obtained from the rheometer 14, the relaxation time λ is obtained from the CaBER-DoS 16, and the density ρ is obtained from the pycnometer 18. In addition, the inner radius r1 of the test tube 30 of the first injection device 22 and the inner radius r2 of the capillary 38 are obtained from the ROM 46 or storage 50. Furthermore, the initial velocity U0 given to the liquid by the first injection device 22 or the second injection device 24 is obtained from the display 20.

[0070] The calculation unit 64 has a function of calculating the Weissenberg number Wi and the Reynolds number Re of the ejected liquid jet based on the various conditions acquired by the condition acquisition unit 62.

[0071] The Reynolds number Re of the injected liquid jet is calculated by the following formula 1. However, when the first injection device 22 is used, r=r1, and when the second injection device 24 is used, r=r2.

[0072]

number

[0073] Furthermore, the Weisenberg number Wi of the injected liquid jet can be calculated by the following formula 2. However, when the first injection device 22 is used, r=r1, and when the second injection device 24 is used, r=r2.

[0074]

number

[0075] In addition, when the injection device determination unit 66 described later decides to use the first injection device 22, the calculation unit 64 has the function of calculating the drop height H of the test tube 30 to be set in the first injection device 22 based on the initial velocity U0 acquired by the condition acquisition unit 62.

[0076] In the first injection device 22, the initial velocity U0 is the sum of the collision velocity V0 of the test tube 30 with the floor material 34 and the rebound velocity V' of the test tube 30 from the floor material 34, and is expressed by the following formula 3.

[0077]

number

[0078] At this time, the collision speed V0 of the test tube 30 against the floor material 34 is expressed by the following formula 4 according to the law of conservation of energy. Here, g is the gravitational acceleration (9.81 m / s 2 ).

[0079]

number

[0080] The rebound velocity V' of the test tube is calculated using the restitution coefficient e according to the following formula 5.

[0081]

number

[0082] Therefore, the calculation unit 64 calculates the drop height H of the test tube 30 to be set in the first injection device 22 using the following formula 6.

[0083]

number

[0084] Furthermore, when the injection device determination unit 66 described later determines to use the second injection device 24, the calculation unit 64 calculates the liquid level difference L between the inside and outside of the capillary 38 to be set in the second injection device 24 based on the initial velocity U0 acquired by the condition acquisition unit 62. top and the distance L between the lower end of the capillary 38 and the gas-liquid interface inside the capillary. cap It has a function of calculating the ratio between and.

[0085] The initial velocity U0 is calculated by the collision velocity V0 of the iron core 40A against the container 36 and the liquid level difference L top and the distance L between the lower end of the capillary 38 and the gas-liquid interface inside the capillary. cap and is expressed by the following formula 7 (Onuki, Hajime, Tagawa, Yoshiyuki. (2015). High Viscosity Liquid Jet Injection Device. Multiphase Flow, 29(4), 335-342.). The collision velocity V0 of the container 36 is a predetermined value determined by the setting of the solenoid 40.

[0086]

number

[0087] Therefore, the calculation unit 64 calculates the liquid level difference L between the inside and outside of the capillary 38 to be set in the second injection device 24 by the following formula 8. top and the distance L between the lower end of the capillary 38 and the gas-liquid interface inside the capillary. cap Calculate the ratio of and.

[0088]

number

[0089] The injection unit determination unit 66 determines the shear viscosity μ s Specifically, the injection unit determination unit 66 has a function of selecting and determining an injection unit suitable for the test based on the value of shear viscosity μ s When the viscosity of the liquid is low, it is decided to use the first injection device 22, and the shear viscosity μ s When the viscosity of the liquid is high, the second injection device 24 is used. s If μ ≦200 mPa·s, it is determined to use the first injection device 22, s If the viscosity is >200 mPa·s, it is decided to use the second injection device 24.

[0090] The image acquisition unit 68 has a function of acquiring images of the liquid jet ejected from the liquid surface from the camera 26. The image acquisition unit 68 acquires a plurality of consecutive images according to the shooting speed and shooting time of the camera 26.

[0091] The maximum extension image extracting section 70 has a function of extracting, from among the multiple images acquired by the image acquiring section 68, an image in which the liquid jet is most extended.

[0092] The contour detection unit 72 has a function of detecting the contour of the liquid jet that appears in the image acquired by the image acquisition unit 68 and extracted by the maximally expanded image extraction unit 70 .

[0093] The droplet scattering determination unit 74 has a function of determining whether droplets have scattered. Specifically, if the outline of the liquid jet shown in the image extracted by the maximally expanded image extraction unit 70 is broken, it is determined that droplets have scattered from the liquid, and if the outline of the liquid jet is not broken, it is determined that droplets have not scattered from the liquid.

[0094] The information processing device does not have to include the maximally expanded image extraction unit 70. In this case, the contour detection unit detects the contour of the liquid jet for each of the multiple images acquired by the image acquisition unit 68. Then, the droplet scattering determination unit determines that droplets have been scattered from the liquid when the contour of the liquid jet is interrupted in at least one image acquired by the image acquisition unit 68, and determines that droplets have not been scattered from the liquid when the contour of the liquid jet is not interrupted in any of the images.

[0095] 6 shows, as an example, the change in behavior of the liquid jet over time when a liquid F3, which is a mixture of water and polyethylene oxide (PEO), is tested using the first jetting device 22. Specifically, assuming that the collision time between the test tube 30 and the floor material 34 is t0=0 ms, A1 Image at t = 25.3 ms and A2 The image at time t = 63.3 ms is shown. As shown in Figure 6, a liquid jet that extends after being ejected from the gas-liquid interface, and whose tip breaks off and droplets scatter is called a "pinch-off jet."

[0096] When the image acquisition unit 68 acquires a plurality of images including the image shown in FIG. 6, the contour detection unit 72 detects the contour of the liquid jet J at each time. For example, A1 The outline of the liquid jet J1 at t A2 The contour of the liquid jet J2 at t in FIG. A2 In the image at t = 63.3 ms, the contour of the detected liquid jet J2 is divided into a residual jet J2' and a liquid droplet D, so the liquid droplet scattering determination unit 74 determines that a liquid droplet D has been scattered from the liquid F3.

[0097] 7 shows the change over time in the behavior of the liquid jet when a liquid F4, which is water with a higher concentration of polyethylene oxide (PEO) than that shown in FIG. 6, is tested using the first jetting device 22. Specifically, the time when the test tube 30 and the floor material 34 collide is set to t0=0 ms, and B1 Image at t = 3.3 ms B2 = 13.0 ms and t B3 The image at time t = 26.9 ms is shown. As shown in Figure 7, a liquid jet that extends long after being ejected from the gas-liquid interface and returns to the initial interface without breaking is called a "bungee jet".

[0098] 7, the contour detection unit 72 detects the contour of the liquid jet J at each time. Since the contour of the liquid jet J is not divided in any of the images, the droplet scattering determination unit 74 determines that droplets are not scattering from the liquid F4.

[0099] 8 shows the change over time in behavior of the liquid jet J when a liquid F5, which is water with a higher concentration of polyethylene oxide (PEO) than that shown in FIG. 7, is tested using the first injection device 22. Specifically, assuming that the collision time between the test tube 30 and the floor material 34 is t0=0 ms, C1 Image at t = 7.7 ms and C2 The image at 17.7 ms is shown. As shown in Fig. 8, the liquid jet that does not extend long after ejection from the gas-liquid interface and immediately returns to the initial interface is called "No jet".

[0100] In contrast to the Pinch-off jet in which droplets are scattered as shown in Fig. 6, the Bungee jet shown in Fig. 7 and the No jet shown in Fig. 8 are collectively referred to as "No Pinch-off jet." In other words, the droplet scattering determination unit 74 determines whether droplets have been scattered (Pinch-off jet) or whether droplets have not been scattered (No Pinch-off jet).

[0101] The bungee jet determination unit 76 has a function of determining, based on the image acquired by the image acquisition unit 68, whether the liquid jet, for the liquid that did not splash, stretched a long distance after being ejected from the gas-liquid interface and returned to the initial interface without breaking (Bungee jet), or whether the liquid jet did not stretch a long distance after being ejected from the gas-liquid interface and immediately returned to the initial interface (No jet). Specifically, the bungee jet determination unit 76 determines the maximum length L jet If is greater than the inner radius r of the pipe, it is judged as a "bungee jet" and the maximum length L of the liquid jet is jet If is less than the inner radius r of the pipe, it is judged as "No jet".

[0102] The output unit 78 has a function of outputting the result of the droplet scattering determination made by the droplet scattering determination unit 74 to the display 20. Here, the information processing device 10 according to this embodiment also has a function of outputting the determination result made by the bungee jet determination unit 76. In other words, the output unit 78 displays on the display 20 whether the result was Pinch-off jet, Bungee jet, or No jet, depending on the test result.

[0103] The output unit 78 also has a function of displaying on the display 20 an image of the liquid jet J at its maximum expansion.

[0104] As an example, the output unit 78 displays the image shown in Fig. 13 on the display 20. This example is an example in which a pinch-off jet occurs, and the result is displayed with the words "Pinch-off jet" together with an image of droplet scattering.

[0105] Furthermore, the output unit 78 outputs the shear viscosity μ s , relaxation time λ and density ρ on the display 20. That is, the output unit 78 has a function of displaying on the display 20 the physical property values ​​of the liquid poured from the injection port 12A.

[0106] Furthermore, the output unit 78 has a function of displaying on the display 20 a graph 80 showing the relationship between the Reynolds number Re and the Weissenberg number Wi, together with an estimated scattering region where droplets are estimated to scatter, an estimated scattering suppression region where droplets are estimated not to scatter, and a plot 82 of the values ​​calculated by the calculation unit 64. Hereinafter, the graph 80 showing the estimated scattering region and the estimated scattering suppression region will be referred to as a "phase diagram 80."

[0107] The output unit 78 displays, on the display 20, a region that satisfies the following formula 9 as an estimated scattering region.

[0108]

number

[0109] Furthermore, the output unit 78 displays on the display 20 a region that satisfies the following mathematical expression 10 as an estimated scattering-suppressed region.

[0110]

number

[0111] In the results shown in FIG. 13, plot 82 belongs to the estimated scattering region.

[0112] 14 shows another example of an image displayed on the display 20. This example shows a case where a bungee jet occurs. The result is displayed with the words "No Pinch-off jet (Bungee jet)" along with an image of the liquid jet at its maximum extension.

[0113] In the results shown in FIG. 14, a plot 84 of the values ​​calculated by the calculation unit 64 belongs to the estimated scattering suppression region in the phase diagram 80.

[0114] The display mode on the display 20 is not limited to the above. For example, the output unit does not have to output the physical properties of the liquid or an image of the jet to the display 20. The determination result may be output as a symbol rather than as text such as "Pinch-off jet." In addition, in the case of Bungee jet or No jet, "No Pinch-off jet" may simply be output. Furthermore, instead of displaying "No Pinch-off jet," "Bungee jet" and "No jet" may simply be output with a distinction between them. In addition, the output unit does not have to output a phase diagram.

[0115] Here, the basis for determining that a region that satisfies Formula 9 or Formula 10 is the estimated scattering-suppressed region will be described with reference to Figs. 15 to 22.

[0116] The condition for suppressing the splashing of liquid is the occurrence of no pinch-off jet. This condition is explained using two dimensionless numbers.

[0117] One is the Reynolds number Re, which represents the ratio of inertial force to viscous force, and is expressed by the above-mentioned formula 1. The other is the Weissenberg number Wi, which represents the influence of elasticity, and is expressed by the above-mentioned formula 2.

[0118] The physical properties of the solution used in the verification experiment are described below. In this experiment, a polymer solution was used as the viscoelastic liquid. The physical properties of the polymer solution are shown in Table 1 below. Polyethylene oxide (PEO) and polyacrylamide (PAM) were used as the polymers.

[0119] [Table 1]

[0120] Polymer solutions were prepared by adding 0.2-2 wt% of PEO or PAM to the solvents, pure water and glycerin aqueous solution (glycerin: 70 wt%, water: 30 wt%), and stirring at 650 rpm at 60°C for more than one day.

[0121] The density ρ was measured using a pycnometer. The relaxation time λ was calculated using CaBER-DoS. Polymer solutions generally exhibit shear-thinning properties, where the viscosity decreases with increasing strain rate.

[0122] Figure 15 shows the shear viscosity of PEO and PAM aqueous solutions measured using a shear rheometer. The dashed line in Figure 15 indicates the reliability limit of the shear viscosity measurement due to the torque sensitivity of the shear rheometer. Figure 15 shows that in all aqueous solutions, the shear viscosity decreases with increasing shear rate, indicating shear-thinning properties. Furthermore, in all solutions, the higher the molecular weight and concentration, the higher the shear viscosity and the steeper the slope of the shear cave. This is because the higher the molecular weight and concentration, the greater the viscoelasticity and the higher the shear-thinning properties.

[0123] Figure 16 shows the results of analyzing jet behavior under various conditions using the Reynolds number Re and the Weisenberg number Wi. The error bars in the figure indicate the error range due to the estimated viscosity. The reason why the error bar range is larger in the region where Wi is large is that the effect of shear-thinning becomes more pronounced as the viscoelasticity of the solution increases, and the change in viscosity due to strain rate becomes greater. Pinch-off jet occurs in the region where Re is large and Wi is small, and no pinch-off jet occurs in other regions. It can be seen that pinch-off jet occurs when inertia is large, and no pinch-off jet occurs when viscosity and elasticity are large. It has also been confirmed that the same results can be analyzed for different polymer solutions.

[0124] The phenomenon will be described in detail below. First, we focus on the region of Wi<10 in Figure 16. In this region, the transition region between the two jets is at Re~250, regardless of Wi. Here, previous research has revealed that when Wi is small, the jet becomes viscous and behaves like a Newtonian fluid (McIlroy, C et al., J. Non-Newton. Fluid Mech, (2013)). Furthermore, a follow-up experiment investigating the jet behavior of a Newtonian fluid revealed that the jet behavior transitions from no pinch-off jet to pinch-off jet at Re~250. Note that when "~" is used in the formulas in this specification, it is intended to indicate an approximation.

[0125] From the above, in the region where Wi is small, the viscoelastic liquid jet behaves like a Newtonian fluid, and the jet behavior is determined only by Re. In addition, the threshold value is thought to be Re ~ 250.

[0126] Next, we focus on the region where Wi>10. In the region where Wi is large, the jet behavior depends on Re and Wi. Since the front end of the jet is faster than the rear end, we assume that the inertia at the jet front end affects the jet behavior, and perform modeling using the FENE-CR model shown in Figure 17 (Hoath, SD et al., J Rheol, (2012)). Figure 17(A) shows the initial state, and Figure 17(B) shows the state in which the jet has been extended t seconds after the initial state.

[0127] As shown in Figure 17(A), the jet tip V drop The time when V is ejected from the initial interface by a distance d is t=0. drop The speed of U d It is.

[0128] Then, as shown in FIG. 17(B), the velocity is decelerated to U at time t. The ligament (jet rear end) V lig The length of the fluid changes uniformly from the initial length d to z with time. The volume of the fluid in the tip and ligaments V drop , Vlig is assumed to be constant.

[0129] Assuming an incompressible fluid, the continuity equation and the NS equation are expressed by the following Equations 11 and 12 using the fluid velocity u, pressure p, and stress tensor σ.

[0130]

number

[0131]

number

[0132] Here, the stress tensor σ is expressed by the following formula 13. s is the shear viscosity of the solution, E is the strain rate tensor, G is the elastic modulus, and I is the identity matrix.

[0133]

number

[0134] The tensor field A is expressed by the following Equation 14.

[0135]

number

[0136] Here, assuming that the extension limit of the polymer chain is L, the following formula 15 is satisfied.

[0137]

number

[0138] When viscous and elastic forces act on the liquid jet with Wi>10, the equation of motion of the tip is expressed by the following Equation 16, where G is the elastic modulus.

[0139]

number

[0140] Assuming an axisymmetric flow, the tensor field A has an axial component A zz and the radial component A rr If the axial extension of the polymer chain is large enough (A zz >>1, A zz >>A rr ), the elastic deformation is assumed to be smaller than the extension limit (A zz < <L 2 →f~1), which can be expressed as the following Equations 17 and 18.

[0141]

number

[0142]

number

[0143] Therefore, the equation of motion can be transformed into the following Equation 19.

number

[0144] The deceleration ΔU at the position z (z>d) is expressed by the following Equation 20.

number

[0145] When z→∞, assuming U=0, we obtain the following Equation 21.

number

[0146] When the elastic term is sufficiently large compared to the viscous term, we obtain the following equation (22).

[0147]

number

[0148] Also, G~μ s / λ, U d Assume that ~βU0, d~r, D drop V calculated as ~αr drop and V lig By substituting the above, the following formulas 23 to 25 are obtained, where α is a constant.

[0149]

number

[0150]

number

[0151]

number

[0152] Wi>2 / 3α 3 At Re, no pinch-off jet occurs because the jet is pulled back by elastic force, and Wi<2 / 3α 3 At Re, it is thought that pinch-off jet occurs due to insufficient elastic force.

[0153] 16, when α was calculated from data close to the threshold, α was about 0.4. Therefore, the threshold in the region where Wi is large is considered to be expressed by the following formula 26.

number

[0154] As described above, the results of the verification experiment shown in FIG. 16 and modeling using the FENE-CR model have led to the estimated scattering region shown in Equation 9 and the estimated scattering suppression region shown in Equation 10.

[0155] Below, a description will be given of a verification experiment for confirming the difference between the presence or absence of scattering for a liquid belonging to the estimated scattering region shown in Equation 9 and a liquid belonging to the estimated scattering suppression region shown in Equation 10.

[0156] Figure 18 shows the results of a quantitative evaluation of the amount of droplets scattered when a metal ball (inner diameter r = 5 mm) was dropped into liquid at a drop height H = 552 mm (initial velocity U0 = 3.3 m / s). The liquids used were water and a viscoelastic liquid (PEO 5M 1 wt%) as shown in Table 2. Figure 18(A) is an image taken of the state when the metal ball was dropped into water. Figure 18(B) is an image taken of the state when the metal ball was dropped into the viscoelastic liquid. Both images were taken 3.0 ms after the impact time t = 0.

[0157] [Table 2]

[0158] Image analysis revealed that the amount of water splashed in Figure 18(A) was 20.62 mm 2 On the other hand, the amount of splashing of the viscoelastic liquid in FIG. 2 This revealed that the scattering of droplets was suppressed by nearly 100% when viscoelasticity was imparted.

[0159] Here, as shown in Fig. 19(A), splashing that occurs during solid-liquid collision (collision between a solid and a liquid) is called "splash 1." Also, as shown in Fig. 19(B), splashing caused by the breakage of the Worthington jet that occurs after the solid-liquid collision is called "splash 2."

[0160] As a result of experiments using water and a viscoelastic liquid (PEO 5M 1 wt%) shown in Table 2 above, both splash 1 and splash 2 were observed in water, as shown in Table 3. On the other hand, in the viscoelastic liquid (PEO 5M 1 wt%), no splashing was observed.

[0161] [Table 3]

[0162] Figure 20(A) is a time series of images showing the behavior of a plastic sphere when it is dropped into water. Figure 20(B) is a time series of images showing the behavior of a plastic sphere when it is dropped into a viscoelastic liquid. The time interval between each captured image is 1.0 ms. The Reynolds number Re and Weissenberg number Wi in this experiment were Re = 8529 and Wi = 0 for water, and Re = 84 and Wi = 54 for the viscoelastic liquid. For water, after the plastic sphere collided with the liquid, fine water droplets were scattered and many splashes were observed. On the other hand, for the viscoelastic liquid, no splashes were observed at all after mixing.

[0163] Furthermore, a verification experiment was conducted by changing the drop height of a plastic ball (inner diameter r = 3 mm). The experimental results are shown in Table 4. The shear viscosity μ of water and viscoelastic liquid used here s , relaxation time λ, and density ρ are as shown in Table 2.

[0164] [Table 4]

[0165] In the case of water, splashing of only splash2 or both splash1 and splash2 was observed. On the other hand, no splashing was observed in the case of viscoelastic liquid. In other words, splashing is suppressed by the viscoelastic effect. The Reynolds number Re and Weissenberg number Wi in this experiment are several thousand to several tens of thousands and Wi=0 for water, and Re≦250 and Wi is several tens for viscoelastic liquid. In Figure 16, the respective regions are the estimated splash region and the estimated splash suppression region, and it can be seen that the phase diagram 80 and the experimental results are consistent.

[0166] Figure 21(A) is a time series of images showing the behavior of a water droplet (r = 1.6 mm) when it is dropped into water. Figure 21(B) is a time series of images showing the behavior of a viscoelastic liquid droplet (r = 1.6 mm) when it is dropped into the viscoelastic liquid. The time interval between each image is 1.0 ms. The Reynolds number Re and Weissenberg number Wi in this experiment are Re = 6488 and Wi = 0 for water, and Re = 65 and Wi = 146 for the viscoelastic liquid.

[0167] As shown in Figure 21(A), fine droplets were observed scattering after the water was dropped. On the other hand, as shown in Figure 21(B), no scattering was observed when the viscoelastic liquid was dropped. Note that the liquid strings in Figure 21(B) were generated during the drop and do not affect the main phenomenon at all.

[0168] Here, as shown in Fig. 22(A), splashing that occurs during liquid-liquid collision (collision between liquids) is called "splash 3." Also, as shown in Fig. 22(B), splashing caused by the breakup of the Worthington jet that occurs after the liquid-liquid collision is called "splash 4."

[0169] Furthermore, a verification experiment was conducted by changing the drop height of the droplet (r = 1.6 mm). The experimental results are shown in Table 5. The shear viscosity μ of water and the viscoelastic liquid used here s , relaxation time λ, and density ρ are as shown in Table 2.

[0170] [Table 5]

[0171] In the case of water, splashing of only splash4 or both splash3 and splash4 was observed. On the other hand, no splashing was observed in the case of viscoelastic liquid. In other words, splashing is suppressed by the viscoelastic effect. The Reynolds number Re and Weissenberg number Wi in this experiment are several thousand Re and Wi=0 for water, and Re≦250 and Wi are several tens to several hundreds for viscoelastic liquid. In Figure 16, the respective regions are the estimated splash region and the estimated splash suppression region, and it can be seen that the phase diagram 80 and the experimental results are in agreement.

[0172] Figure 23(A) is a time series of images showing the behavior of water droplets when dropped onto a rotating metal rod. Figure 23(B) is a time series of images showing the behavior of a viscoelastic liquid when dropped onto a rotating metal rod. The rotation speed of the metal rod per minute was 2000 rpm, which is the standard rotation speed when milling alloys. The initial speed of the rotating metal rod was U0 = 1.3 m / s, and the radius was r = 6 mm. The shear viscosity μ of water and the viscoelastic liquid used here was s , relaxation time λ, and density ρ are as shown in Table 2.

[0173] Figure 23(A) shows the pinch-off of the liquid jet 100 ms after water was dropped onto a rotating metal rod. For water, significant droplet scattering was observed 43 ms after the drop. This is similar to the scattering behavior of conventional lubricants (cutting oils) due to collisions with cutting teeth.

[0174] On the other hand, Figure 23(B) shows that 210 ms after the viscoelastic liquid was dropped, the liquid stretched due to the rotation and liquid strings were formed, which prevented the droplets from scattering.

[0175] The Reynolds number Re and Weissenberg number Wi in this experiment are Re ~ 7560 and Wi = 0 for water, and Re = 75 and Wi ~ 12 for viscoelastic liquid. In Fig. 16, the respective regions are the scattering region and the estimated scattering suppression region, and it can be seen that the phase diagram 80 and the experimental results are in agreement.

[0176] (action) Next, the operation of this embodiment will be described.

[0177] An example of the ejection device selection process, the liquid jet ejection process, and the determination process by the information processing device 10 of this embodiment will be described with reference to the flowcharts shown in Figures 9 to 12. These processes are executed by the CPU 44 reading out a display program from the ROM 46 or the storage 50, expanding it in the RAM 48, and executing it.

[0178] (An example of injection unit selection process) The CPU 44 detects the liquid in step S100. Specifically, by using the function of the reception unit 58, the CPU 44 receives from the liquid-detecting device 56 that the liquid F has been injected from the injection port 12A.

[0179] In step S102, the CPU 44 measures the physical property values ​​of the liquid. Specifically, the CPU 44 controls the rheometer 14 by the function of the control unit 60 to measure the shear viscosity μ s , controls the CaBER-DoS 16 to measure the relaxation time λ, and controls the pycnometer 18 to measure the density ρ of the liquid.

[0180] In step S104, the CPU 44 acquires various conditions necessary for calculating the Reynolds number Re and the Weissenberg number Wi of the liquid. Specifically, the CPU 44 acquires the shear viscosity μ s is obtained from the rheometer 14, the relaxation time λ is obtained from the CaBER-DoS 16, and the density ρ is obtained from the pycnometer 18. In addition, the inner radius r1 of the test tube 30 of the first injection device 22 and the inner radius r2 of the capillary 38 are obtained from the ROM 46 or storage 50. Furthermore, the initial velocity U0 given to the liquid by the first injection device 22 or the second injection device 24 is obtained from the display 20.

[0181] In step S106, the CPU 44 determines whether 0<μ s The CPU 44 judges whether or not 0<μ≦200 mPa·s by the function of the injection unit determination unit 66 in step S106. sIf it is determined that the viscosity is less than or equal to 200 mPa·s, the process proceeds to step S108, and it is determined to use the first injection unit 22. On the other hand, if the viscosity is less than or equal to 0 in step S106, the CPU 44 s If it is determined that the value is not ≦200 mPa s, that is, μ s If it is >200 mPa·s, the process proceeds to step S110 and it is determined that the second injection unit 24 is to be used.

[0182] (An example of liquid jet injection processing) When the CPU 44 determines in step S108 to use the first ejection device 22, the CPU 44 executes the liquid jet ejection process shown in FIG.

[0183] In step S112, the CPU 44 calculates the drop height H of the test tube 30 to be set in the first injection device 22. Specifically, the CPU 44 calculates the drop height H using Equation 6 by using the function of the calculation unit 64.

[0184] In step S114, the CPU 44 sets the first injection device 22. Specifically, the CPU 44 injects liquid to the height L into the test tube 30 of the first injection device 22 through the function of the control unit 60. In addition, the CPU 44 controls a height adjustment mechanism (not shown) of the first injection device 22 through the function of the control unit 60 to adjust the drop height H, etc.

[0185] In step S116, the CPU 44 sets the camera 26 and the light source 28. Specifically, the CPU 44, by using the function of the control unit 60, aims the camera 26 and the light source 28 toward the first emission device 22 and adjusts the height of the camera 26 and the light source 28.

[0186] In step S118, the CPU 44 drops the test tube 30. Specifically, the CPU 44, using the function of the control unit 60, switches a switch (not shown) of the first ejection device 22 to drop the test tube 30, and captures the behavior of the liquid jet with the camera 26.

[0187] (Another example of liquid jet injection processing) On the other hand, when the CPU 44 determines to use the second ejection unit 24 in step S110 shown in FIG. 9, it executes the liquid jet ejection process shown in FIG.

[0188] In step S120, the CPU 44 determines the liquid level difference L between the inside and outside of the capillary 38 to be set in the second injection device 24. top and the distance L between the lower end of the capillary 38 and the gas-liquid interface inside the capillary. cap Specifically, the CPU 44 calculates the ratio of the liquid level difference L between the inside and outside of the capillary 38 to be set by the formula 8 using the function of the calculation unit 64. top and the distance L between the lower end of the capillary 38 and the gas-liquid interface inside the capillary. cap Calculate the ratio to.

[0189] In step S122, the CPU 44 sets the second injection device 24. Specifically, the CPU 44 controls the syringe pump 42 of the second injection device 24 by the function of the control unit 60 to adjust the distance L between the lower end of the capillary 38 and the gas-liquid interface inside the capillary. cap and the liquid level difference L between the inside and outside of the capillary 38 top Adjust.

[0190] In step S124, the CPU 44 sets the camera 26 and the light source 28. Specifically, the CPU 44, by using the function of the control unit 60, aims the camera 26 and the light source 28 toward the second emission device and adjusts the height of the camera 26 and the light source 28.

[0191] In step S126, the CPU 44 applies an impact force to the container 36. Specifically, the CPU 44 controls the solenoid 40 of the second ejection device 24 by the function of the control unit 60 to collide the iron core 40A with the bottom of the container 36, and captures the behavior of the liquid jet with the camera 26.

[0192] (An example of a judgment process) After dropping the test tube 30 of the first ejection device 22 in step S118 shown in Fig. 10, or after applying an impact force to the container 36 of the second ejection device 24 in step S126 shown in Fig. 11, the CPU 44 acquires images from the camera 26 in step S128 shown in Fig. 12. Specifically, the CPU 44 acquires multiple time-series images of the liquid jet ejected from the liquid surface from the camera 26 by using the function of the image acquisition unit 68.

[0193] In step S130, the CPU 44 detects the contour of the liquid jet. Specifically, the CPU 44 uses the function of the maximally expanded image extraction unit 70 to extract an image in which the liquid jet is most expanded from among the multiple images acquired by the image acquisition unit 68, and uses the function of the contour detection unit 72 to detect the contour of the liquid jet appearing in the extracted image.

[0194] In step S132, the CPU 44 determines whether or not the contour is divided. Specifically, the CPU 44 determines whether or not the contour of the liquid jet shown in the extracted image is divided by the function of the droplet scattering determination unit 74.

[0195] If the CPU 44 determines in step S132 that the contour of the liquid jet is broken, the process proceeds to step S134, where it determines that a droplet has been scattered (pinch-off jet), and the process proceeds to step S144.

[0196] On the other hand, if the CPU 44 determines in step S132 that the contour of the liquid jet is not interrupted, the process proceeds to step S136 and determines that the liquid droplets are not scattered (No Pinch-off jet).

[0197] In step S138, the CPU 44 calculates the maximum length L jet Specifically, the CPU 44 determines whether the maximum length L of the liquid jet extended by the function of the bungee jet determination unit 76 is greater than the inner radius r of the pipe. jetIf is greater than the pipe inner radius r, the process proceeds to step S140, where it is determined to be a "Bungee jet." Then, the process proceeds to step S144.

[0198] On the other hand, the CPU 44 determines the maximum length L of the liquid jet by the function of the bungee jet determination unit 76. jet If is equal to or smaller than the inner radius r of the pipe, the process proceeds to step S142, where it is determined to be "No jet." Then, the process proceeds to step S144.

[0199] If the CPU 44 judges "Pinch-off jet" in step S134, if the CPU 44 judges "Bungee jet" in step S140, or if the CPU 44 judges "No jet" in step S142, it outputs the judgment result in step S144. Specifically, the CPU 44 uses the function of the output unit 78 to display the judgment result of the droplet scattering judged by the droplet scattering judgement unit 74 (whether the result was Pinch-off jet, Bungee jet, or No jet) on the display 20, as shown in Fig. 13 or 14. At this time, the CPU 44 uses the function of the output unit 78 to display on the display 20 each physical property value acquired by the condition acquisition unit 62 together with an image of the liquid jet J at its maximum extension.

[0200] The CPU 44 calculates the Reynolds number Re and the Weissenberg number Wi in step S146. The CPU 44 uses the function of the calculation unit 64 to calculate the Reynolds number Re using Equation 1, and calculates the Weissenberg number Wi using Equation 2. Note that the timing for calculating the Reynolds number Re and the Weissenberg number Wi is not limited to step S146, and they may be calculated immediately after acquiring the physical property values ​​and initial velocity conditions of the liquid in step S102, for example.

[0201] The CPU 44 outputs a graph in step S148. Specifically, the CPU 44 uses the function of the output unit 78 to display on the display 20, in the phase diagram 80, a scattering estimation region where it is estimated that droplets will scatter, a scattering suppression estimation region where it is estimated that droplets will not scatter, and a plot of the value calculated by the calculation unit 64. The graph may be output simultaneously with the determination result.

[0202] As described above, in the information processing system S according to this embodiment, a liquid jet is ejected from the liquid surface by the first ejection device 22 or the second ejection device 24. In addition, an image of the ejected liquid jet is taken by the camera 26.

[0203] Furthermore, an image of the liquid jet ejected from the liquid surface is acquired from the camera 26 by the image acquisition unit 68 of the information processing device 10. Here, if the liquid jet in the image acquired by the image acquisition unit 68 is broken up, the droplet scattering determination unit 74 of the information processing device 10 determines that droplets have been scattered from the liquid. On the other hand, if the liquid jet in the image is not broken up, the droplet scattering determination unit 74 determines that droplets have not been scattered from the liquid. The determination result of droplet scattering determined by the droplet scattering determination unit 74 is output by the output unit 78 of the information processing device 10. In other words, it is possible to determine and output whether or not droplets have been scattered from the liquid.

[0204] Furthermore, according to the information processing device 10 of this embodiment, the contour of the liquid jet is detected by the contour detection unit 72. Then, the droplet scattering determination unit 74 determines that droplets have been scattered if the detected contour of the liquid jet is divided, and determines that droplets have not been scattered if the detected contour of the liquid jet is not divided. Therefore, the presence or absence of droplet scattering can be determined with high accuracy based on the detected contour of the liquid jet.

[0205] Furthermore, according to the information processing device 10 of this embodiment, the determination result of the presence or absence of droplet scattering is output to the display 20 by the output unit 78. This allows the user of the information processing device 10 to visually grasp the determination result.

[0206] Furthermore, according to the information processing device 10 of this embodiment, in a graph showing the relationship between the Reynolds number Re and the Weisenberg number Wi, a plot of the calculated values, an estimated scattering region where it is estimated that droplets will scatter, and an estimated scattering-suppression region where it is estimated that droplets will not scatter are displayed together on the display 20. This allows the user of the information processing device 10 to visually grasp whether the plot of the values ​​calculated from the acquired conditions belongs to the estimated scattering region or the estimated scattering-suppression region, together with the determination result of the presence or absence of droplet scattering.

[0207] In addition, the user can visually grasp how far the acquired conditions are from the boundary between the estimated scattering region and the estimated scattering suppression region. Therefore, for example, even if it is determined that droplets are not scattering under a certain condition, if the plot of the value calculated from the condition belongs to the estimated scattering region, or if it is located in the estimated scattering suppression region close to the boundary with the estimated scattering region, the user of the information processing device can know that the conditions are such that droplets may scatter. In other words, the user of the information processing device 10 can grasp the ease (or difficulty) of droplets scattering under the certain condition together with the determination result of whether or not droplets have actually been scattered. This allows the user of the information processing device 10 to easily select a liquid that can suppress droplet scattering.

[0208] Furthermore, according to the information processing device 10 of this embodiment, in the case of No Pinch-off jet, it is determined whether the result was Bungee jet or No jet, and this is output to the display 20. Also, an image of the liquid jet J at its maximum extension is displayed on the display 20. This makes it even clearer how difficult it is for the droplets to scatter, so that the user of the information processing device 10 can even more easily select a liquid that can suppress the scattering of droplets.

[0209] Furthermore, according to the information processing device 10 of this embodiment, each physical property value acquired by the condition acquisition unit 62 is displayed on the display 20. Therefore, the user of the information processing device 10 can easily select a liquid that can suppress scattering of droplets by adjusting the physical property value.

[0210] Moreover, according to the information processing device 10 of this embodiment, detection and measurement of the physical properties of the liquid injected from the injection port 12A are automatically performed, and the physical properties are displayed on the display 20. This reduces the labor required for testing and shortens the test time.

[0211] Furthermore, according to the information processing device 10 of this embodiment, the injection unit determination unit 66 automatically selects an injection unit suitable for use, and the control unit 60 automatically executes the test using the selected first injection unit 22 or second injection unit 24. This makes it possible to further reduce the labor required for testing and shorten the test time.

[0212] As described above, according to the information processing device 10 according to this embodiment, the user of the information processing device 10 can easily select a liquid that can suppress the scattering of droplets itself.

[0213] Conventionally, in order to prevent droplets from scattering, a method of physically separating a space by installing a protective wall, etc., has been known. However, the methods for suppressing the scattering of droplets themselves are limited.

[0214] The information processing device 10 according to the present embodiment enables the suppression of scattering of liquids taking into account the physical properties of the liquids, and can contribute to the suppression of scattering of various liquids, such as liquids used in industrial processes such as hardening and cutting, chemicals such as insecticides and chlorine-based chemicals, and cooking oils.

[0215] [Supplementary explanation of the above embodiment] Although the information processing device 10 according to the embodiment has been described above, it is needless to say that the present invention can be embodied in various forms without departing from the gist of the present invention.

[0216] In the above embodiment, the output unit 78 displays the determination result on the display 20, but this is not limiting. For example, the output unit may output the determination result as sound from a speaker.

[0217] Furthermore, in the above embodiment, in the graph showing the relationship between the Reynolds number Re and the Weissenberg number Wi, the estimated scattering region where droplets are estimated to scatter, the estimated scattering suppression region where droplets are estimated not to scatter, and the plot of the values ​​calculated by the calculation unit are all displayed on the display 20, but this is not limited to the above. For example, the output unit may output only the determination result, and may not output the graph, each physical property value, and image.

[0218] Furthermore, in the above embodiment, the condition acquisition unit 62 acquires the shear viscosity μ s In the above description, the relaxation time λ is obtained from the rheometer 14, the relaxation time λ is obtained from the CaBER-DoS 16, and the density ρ is obtained from the pycnometer 18, but the present invention is not limited to this. For example, the user may input the physical property values ​​measured by each measuring device into the input device, and the input physical property values ​​may be acquired by the condition acquisition unit.

[0219] In the above embodiment, the condition acquisition unit 62 acquires the initial velocity U0 given to the liquid by the first ejection device 22 or the second ejection device 24 from the display 20, i.e., acquires a value input by the user, but this is not limited to the above. For example, the CPU 44 may calculate U0 at which Re=250 based on the physical property values ​​of the liquid, and acquire the U0 as the test condition. This makes it possible to execute the test at the boundary between the estimated scattering region and the estimated scattering suppression region when Wi is small.

[0220] Furthermore, the information processing system S has been described as being configured to include various devices inside the housing 12, but is not limited to this. For example, the liquid jet ejecting device, the photographing device, and the information processing device may be connected to each other via a network.

[0221] Furthermore, in the above embodiment, the first ejection device 22 or the second ejection device 24 is used as the liquid jet ejection device, but this is not limited thereto. For example, a liquid jet may be generated by irradiating a laser onto a microtube filled with liquid. Also, a device that ejects a liquid jet having a diameter equal to or larger than the inner diameter of the ejection tube may be used. Furthermore, an ejection device that pushes liquid out of an ejection hole (nozzle) may be used, such as a piezo inkjet system or a bubble jet (registered trademark) system used in inkjet printers.

[0222] In addition, the processing that the CPU 44 reads and executes the program in the above embodiment may be executed by various processors other than the CPU 44. Examples of the processor in this case include a PLD (Programmable Logic Device) whose circuit configuration can be changed after manufacture such as an FPGA (Field-Programmable Gate Array), and a dedicated electric circuit that is a processor having a circuit configuration designed exclusively for executing a specific process such as an ASIC (Application Spec Integrated Circuit). The above process may be executed by one of these various processors, or may be executed by a combination of two or more processors of the same or different types, for example, by multiple FPGAs, or a combination of a CPU and an FPGA. The hardware structure of these various processors is, more specifically, an electric circuit that combines circuit elements such as semiconductor elements.

[0223] Furthermore, in the above embodiment, various data are stored in the storage 50, but the present invention is not limited to this. For example, a non-transitory recording medium such as a CD (Compact Disk), a DVD (Digital Versatile Disk), or a USB (Universal Serial Bus) memory may be used as the storage unit. In this case, various programs and data are stored in these recording media.

[0224] Furthermore, the process flow described in the above embodiment is just an example, and unnecessary steps may be deleted, new steps may be added, or the process order may be changed, without departing from the spirit of the invention.

[0225] Regarding the above embodiment, the following supplementary notes are further disclosed.

[0226] (Appendix 1) an image acquisition unit that acquires an image of the liquid jet ejected from the liquid surface using an image capture device; a droplet scattering determination unit that determines that droplets have scattered from the liquid when the liquid jet in the image acquired by the image acquisition unit is interrupted, and that droplets have not scattered from the liquid when the liquid jet in the image is not interrupted; an output unit that outputs a result of the determination of the droplet scattering determined by the droplet scattering determination unit; An information processing device having the above configuration. (Appendix 2) a contour detection unit for detecting a contour of the liquid jet from the image; the droplet scattering determination unit determines that droplets have been scattered from the liquid when the contour of the liquid jet is interrupted, and determines that droplets have not been scattered from the liquid when the contour of the liquid jet is not interrupted. 2. An information processing device according to claim 1. (Appendix 3) The output unit displays the determination result on a display device. 3. An information processing device according to claim 1 or 2. (Appendix 4) The shear viscosity μ of the liquid s [N·s / m 2 ], relaxation time λ[s], density ρ[kg / m 3 a condition acquisition unit that acquires the inner radius r [m] of a pipe of a liquid jet ejecting device that ejects the liquid jet, and an initial velocity U0 [m / s] that the liquid jet ejecting device imparts to the liquid; a calculation unit that calculates a Reynolds number Re of the liquid jet, which is expressed by the following Equation 1, and a Weissenberg number Wi of the liquid jet, which is expressed by the following Equation 2, based on the conditions acquired by the condition acquisition unit; and The output unit displays on the display device a graph showing the relationship between the Reynolds number Re and the Weissenberg number Wi, together with a scattering estimation region where the droplets are estimated to scatter, a scattering suppression estimation region where the droplets are estimated not to scatter, and a plot of the value calculated by the calculation unit. 4. The information processing device according to claim 3.

number

number

[0227] 10. Information processing device 22 First ejection device (liquid jet ejection device) 24 Second injection device (liquid jet injection device) 26 High-speed camera (photography equipment) 62 Condition Acquisition Section 64 Calculation section 68 Image Acquisition Unit 72 Contour detection section 74 Droplet scattering determination section 78 Output section 80 Phase Diagram 82 Plot 84 Plot D droplet F liquid J Liquid Jet S Information Processing System

Claims

1. an image acquisition unit that acquires an image of the liquid jet ejected from the liquid surface using an image capture device; a droplet scattering determination unit that determines that droplets have scattered from the liquid when the liquid jet in the image acquired by the image acquisition unit is interrupted, and that droplets have not scattered from the liquid when the liquid jet in the image is not interrupted; an output unit that outputs a result of the determination of the droplet scattering determined by the droplet scattering determination unit; An information processing device having the above configuration.

2. a contour detection unit for detecting a contour of the liquid jet from the image; the droplet scattering determination unit determines that droplets have been scattered from the liquid when the contour of the liquid jet is interrupted, and determines that droplets have not been scattered from the liquid when the contour of the liquid jet is not interrupted. The information processing device according to claim 1 .

3. The output unit displays the determination result on a display device. The information processing device according to claim 1 .

4. The shear viscosity μ of the liquid ｓ [N·s / m ２ ], relaxation time λ [s], density ρ [kg / m ３ ], the inner radius r [m] of the pipe of the liquid jet ejecting device that ejects the liquid jet, and the initial velocity U ０ A condition acquisition unit for acquiring [m / s]; a calculation unit that calculates a Reynolds number Re of the liquid jet, which is expressed by the following Equation 1, and a Weissenberg number Wi of the liquid jet, which is expressed by the following Equation 2, based on the conditions acquired by the condition acquisition unit; and The output unit displays on the display device a graph showing the relationship between the Reynolds number Re and the Weissenberg number Wi, together with a scattering estimation region where the droplets are estimated to scatter, a scattering suppression estimation region where the droplets are estimated not to scatter, and a plot of the value calculated by the calculation unit. The information processing device according to claim 3 . [0010] [0025]

5. the output unit displays, on the display device, a region that satisfies Re≧250 and Wi≦0.043Re as the estimated scattering region. The information processing device according to claim 4.

6. a liquid jet ejection device that ejects a liquid jet from a liquid surface; an image capturing device that captures an image of the liquid jet ejected by the liquid jet ejecting device; The information processing device according to any one of claims 1 to 5, which acquires the image from the photographing device, determines whether or not droplets are scattered based on the image, and outputs a determination result; An information processing system having the above configuration.

7. An image of the liquid jet ejected from the liquid surface is obtained from an imaging device; determining that droplets have been scattered from the liquid when the liquid jet in the acquired image is interrupted, and determining that droplets have not been scattered from the liquid when the liquid jet in the acquired image is not interrupted; Output the result of the droplet scattering judgment Droplet scattering determination method.

8. An image of the liquid jet ejected from the liquid surface is obtained from an imaging device; determining that droplets have been scattered from the liquid when the liquid jet in the acquired image is interrupted, and determining that droplets have not been scattered from the liquid when the liquid jet in the acquired image is not interrupted; Output the result of the droplet scattering judgment An information processing program that causes a computer to execute processing.

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