An experimental device for studying bubble slip and a method for measuring bubble parameters

Abstract

The present application discloses an experimental device for studying bubble slip and a method for determining bubble parameters. The experimental device includes: a fluid channel, a bubble generating device, a fluid generating device, a flow rate regulating and measuring device, a bubble imaging device and a processor. The fluid channel includes a visualization channel, and the inclination of the fluid channel can be adjusted. The bubble generating device is used to generate bubbles of different sizes. The fluid generating device is connected to one end of the fluid channel and is used to provide fluid to the fluid channel. The flow rate regulating and measuring device is used to adjust and measure the flow rate of the fluid. The bubble imaging device is used to photograph the bubble to form a bubble image. The processor is connected to the bubble imaging device and is used to obtain the bubble image and generate the angle and equivalent diameter of the bubble according to the bubble image. The experimental device can be used to measure the relevant parameters of the fluid flow rate, bubble volume and bubble angle in the actual experiment, so the data is more accurate, and the conclusion of the experiment is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid dynamics, and in particular relates to an experimental device for studying bubble slip and a bubble parameter determination method. Background Art

[0002] Bubble slip control technology is widely used in many technical fields such as water conservancy, crystal growth, solid super slip surface slip performance testing, microfluidic control, self-cleaning materials and biotechnology. The key content of studying bubble slip control technology is to study the relationship between the above-mentioned related parameters when bubbles of different sizes are in a critical slip state in the channel wall in fluids with different flow rates and at different wall angles. The related parameters include: the volume of the bubble, the flow rate of the fluid and the wall angle when the bubble is in a critical slip state. In order to make the conclusion of this research work more accurate, the above-mentioned related parameters must be obtained more accurately.

[0003] In the prior art, computer simulation software is usually used to perform simulation analysis and obtain relevant parameters.

[0004] However, simulation analysis using computer simulation software cannot take into account the influence of various factors in real experiments, so the relevant parameters obtained have larger errors than those obtained through real experiments. Therefore, its value can only be used as a reference and cannot completely replace the real experimental data. Summary of the invention

[0005] The present invention discloses an experimental device for studying bubble slip and a bubble parameter determination method, which can accurately obtain the flow rate of the fluid, the angle of the bubble and the equivalent diameter of the bubble in the experiment of studying the bubble slip control technology.

[0006] In order to achieve the above-mentioned purpose, in the first aspect, the present invention discloses an experimental device for studying bubble slippage, the experimental device comprising: a fluid channel, a bubble generating device, a fluid generating device, a flow rate regulating and measuring device, a bubble imaging device and a processor. The fluid channel comprises a visualization channel, the inclination of the fluid channel can be adjusted, and the fluid channel is used for fluid flow. The bubble generating device is connected to the fluid channel and is used to generate bubbles of different sizes on one side of the inner wall of the fluid channel at the connection point. The fluid generating device is connected to one end of the fluid channel and is used to provide fluid to the fluid channel. The flow rate regulating and measuring device is used to adjust and measure the flow rate of the fluid.

[0007] The bubble imaging device is used to photograph the bubble to form a bubble image. The processor is connected to the bubble imaging device, and is used to obtain the bubble image and generate the angle and equivalent diameter of the bubble according to the bubble image, wherein the angle refers to the angle between the tangent line of the bubble surface at the contact point with the inner wall and the inner wall, and the equivalent diameter refers to the diameter of a circle having the same area as the complete bubble corresponding to the bubble image.

[0008] Optionally, the experimental device for studying bubble slip also includes an automatic controller, which is connected to the bubble generating device and is used to automatically control the operation of the bubble generating device; and / or, the automatic controller is connected to the fluid generating device and is used to automatically control the operation of the fluid generating device; and / or, the automatic controller is connected to the flow rate regulation and measurement device and is used to automatically control the operation of the flow rate regulation and measurement device; and / or, the automatic controller is connected to the bubble imaging device and is used to automatically control the operation of the bubble imaging device.

[0009] Optionally, the experimental device for studying bubble slip also includes a first telescopic device and a second telescopic device. When conducting the experiment, the first telescopic device and the second telescopic device are respectively connected to different positions along the axial direction of the fluid channel.

[0010] Optionally, the first telescopic device and / or the second telescopic device is provided with scales along the telescopic direction.

[0011] Optionally, the bubble generating device includes a bubble generating channel, a pressure regulating member and a flow meter, and the pressure regulating member and the flow meter are connected through the bubble generating channel.

[0012] Optionally, the bubble imaging device includes a camera.

[0013] Optionally, the bubble imaging device further comprises a background plate, and the background plate is used to be arranged on a side of the fluid channel away from the camera.

[0014] In a second aspect, the present invention discloses a method for measuring foam parameters, which is performed using any one of the experimental devices for studying foam slippage described in the first aspect. The method for measuring foam parameters comprises:

[0015] Acquiring the bubble image;

[0016] The angle and equivalent diameter of the bubble are generated according to the bubble image; the angle refers to the angle between the tangent of the surface of the bubble at the contact point with the inner wall and the inner wall, and the equivalent diameter refers to the diameter of a circle equal to the area of ​​the complete bubble corresponding to the bubble image.

[0017] Optionally, generating the angle and equivalent diameter of the bubble according to the bubble image includes:

[0018] Acquiring the bubble image and identifying pixels of the bubble image;

[0019] Generating a first virtual outline of the bubble according to the pixel arrangement and distribution of the bubble image;

[0020] generating an angle α of the bubble according to the first virtual contour;

[0021] generating a second virtual outline of a complete bulb corresponding to the bulb according to the first virtual outline;

[0022] Generate the area S of the complete bubble according to the second virtual contour;

[0023] Based on the area S, the equivalent diameter D is calculated.

[0024] Optionally, generating a second virtual outline of a complete bulb corresponding to the bulb according to the first virtual outline comprises:

[0025] Establishing a coordinate system based on the bubble image;

[0026] Acquire a plurality of first contour points on the first virtual contour;

[0027] Establishing a mathematical model of the complete bubble according to the plurality of the first contour points;

[0028] generating a plurality of second contour points according to the mathematical model;

[0029] The second virtual contour is generated according to a plurality of the second contour points.

[0030] Compared with the prior art, the beneficial effects of the present application are at least:

[0031] Since the inclination of the fluid channel can be adjusted, the fluid channel can be experimented at different angles, so the experimental device can study the effect of the angle of the fluid channel on the slippage of the bubble. Next, since the fluid generating device is connected to one end of the fluid channel and is used to provide fluid to the fluid channel, and the flow rate regulating and measuring device is used to regulate and measure the flow rate of the fluid, it can provide a stable fluid environment for the experiment, and can measure the flow rate of the fluid during the experiment. In addition, the flow rate of the fluid can be flexibly adjusted according to the actual needs of the experiment, so the experimental device can study the effect of the flow rate of the fluid on the slippage of the bubble. Next, since the bubble generating device is connected to the fluid channel and is used to generate bubbles of different sizes on the side of the inner wall of the fluid channel at the connection point, the experimental device can study the effect of bubbles of different volumes on the slippage of the bubble.

[0032] Next, since the bubble imaging device is used to photograph the bubble to form a bubble image, the bubble imaging device can quickly and continuously photograph to form multiple continuous photos, so the shape of the bubble can be recorded in real time, and the corresponding shape of the bubble when critical slip occurs can be recorded. Next, since the processor is connected to the bubble imaging device and is used to obtain the bubble image and generate the angle and equivalent diameter of the bubble according to the bubble image, the experimental device can automatically generate the angle and equivalent diameter of the bubble, thereby improving the efficiency of the experiment.

[0033] Since the flow rate of the fluid, the volume of the bubble and the angle of the bubble are all obtained based on actual experiments, they are more accurate than the data obtained by simulation using simulation software, thereby making the experimental conclusion more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a schematic diagram of the structure of an experimental device for studying bubble slip provided in an embodiment of the present application;

[0036] Figure 2 yes Figure 1 Detailed structural diagram at A in the middle;

[0037] Figure 3 It is a flow chart of a method for measuring bubble parameters provided in an embodiment of the present application;

[0038] Figure 4 yes Figure 3 A specific flow chart of step 302;

[0039] Figure 5 yes Figure 4 Specific flow chart of step 404.

[0040] Description of reference numerals:

[0041] 1-fluid channel, 11-visualization channel, 2-bubble generating device, 21-bubble generating channel, 22-pressure regulating member, 23-flow meter, 24-precision regulating valve, 25-switch, 26-nozzle, 3-fluid generating device, 4-flow rate regulating and measuring device, 41-flow rate regulating member, 42-flow rate measuring member, 5-bubble imaging device, 51-camera, 52-background plate, 6-processor, 7-automatic controller, 8-first telescopic device, 9-second telescopic device, 100-experimental device for studying bubble slip,

[0042] E-bubble, F-complete bubble, G-first virtual outline, H-second virtual outline. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0045] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0046] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0048] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0049] Figure 1 1 is a schematic diagram of the structure of an experimental device 100 for studying bubble slip provided in an embodiment of the present application. Figure 2 yes Figure 1 Detailed structural diagram at A in the figure.

[0050] See also Figure 1 and Figure 2 The experimental device 100 for studying bubble slippage includes: a fluid channel 1, a bubble generating device 2, a fluid generating device 3, a flow rate regulating and measuring device 4, a bubble imaging device 5 and a processor 6. The fluid channel 1 includes a visualization channel 11, the inclination of the fluid channel 1 can be adjusted, and the fluid channel 1 is used for fluid flow. The bubble generating device 2 is connected to the fluid channel 1 and is used to generate bubbles E of different sizes on the side of the inner wall of the fluid channel 1 at the connection point. The fluid generating device 3 is connected to one end of the fluid channel 1 and is used to provide fluid to the fluid channel 1. The flow rate regulating and measuring device 4 is used to adjust and measure the flow rate of the fluid.

[0051] The bubble imaging device 5 is used to photograph the bubble E to form a bubble image. The processor 6 is connected to the bubble imaging device 5, and is used to obtain the bubble image and generate the angle and equivalent diameter of the bubble E according to the bubble image. The angle refers to the angle between the tangent line of the surface of the bubble E at the contact point with the inner wall and the inner wall, and the equivalent diameter refers to the diameter of a circle having the same area as the complete bubble F corresponding to the bubble image.

[0052] In this embodiment, since the inclination of the fluid channel 1 can be adjusted, the fluid channel 1 can be experimented at different angles, so the experimental device 100 can study the effect of the angle of the fluid channel 1 on the slippage of the bubble E. Next, since the fluid generating device 3 is connected to one end of the fluid channel 1 and is used to provide fluid to the fluid channel 1, and the flow rate regulating and measuring device 4 is used to regulate and measure the flow rate of the fluid, it can provide a stable fluid environment for the experiment, and can measure the flow rate of the fluid during the experiment. In addition, the flow rate of the fluid can be flexibly adjusted according to the actual needs of the experiment, so the experimental device 100 can study the effect of the flow rate of the fluid on the slippage of the bubble E. Next, since the bubble generating device 2 is connected to the fluid channel 1 and is used to generate bubbles E of different sizes on the side of the inner wall of the fluid channel 1 at the connection point, the experimental device 100 can study the effect of bubbles E of different volumes on the slippage of the bubble.

[0053] Next, since the bubble imaging device 5 is used to photograph the bubble E to form a bubble image, the bubble imaging device 5 can quickly and continuously photograph to form a plurality of continuous photos, so the shape of the bubble E can be recorded in real time, and the corresponding shape when the bubble E undergoes critical slip can be recorded. Next, since the processor 6 is connected to the bubble imaging device 5 and is used to obtain the bubble image and generate the angle and equivalent diameter of the bubble E according to the bubble image, the experimental device 100 can automatically generate the angle and equivalent diameter of the bubble E, thereby improving the efficiency of the experiment.

[0054] Since the flow rate of the fluid, the volume of the bubble E and the angle of the bubble E are all obtained based on actual experiments, they are more accurate than the data obtained by simulation using simulation software, thereby making the experimental conclusion more accurate.

[0055] Wherein, the above-mentioned fluid can be a liquid, specifically pure water, a solution or oil. The above-mentioned fluid can also be a gas, specifically air, nitrogen or an inert gas. When the fluid is a liquid, the above-mentioned bubble E is a bubble, and the gas in the bubble can be air, nitrogen or an inert gas. When the fluid is a gas, the above-mentioned bubble E is a vacuole, and the liquid in the vacuole can be pure water, a solution or oil. The embodiments of the present application do not limit the type of gas or liquid.

[0056] When the fluid is a liquid, in order to be able to observe the change in the flow rate of the fluid vividly, tracer particles with good reflectivity can be added to the above-mentioned fluid, so that when the bubble imaging device 5 performs continuous shooting, multiple bubble images can be obtained. By comparing the multiple bubble images, the speed of the tracer particles at various positions along the cross-sectional direction of the fluid channel 1 can be observed, and then the flow rate of the fluid at various positions along the cross-sectional direction of the fluid channel 1 can be reflected, and the flow field distribution along the cross-sectional direction of the fluid channel 1 can be determined. Therefore, the experimental device 100 can also study the influence of the flow field of the fluid on the bubble slip.

[0057] The above-mentioned flow rate regulation and measurement device 4 includes a flow rate regulating component 41 and a flow rate measuring component 42. The flow rate regulating component 41 and the flow rate measuring component 42 are connected through a fluid channel 1, so that the operations of adjusting the flow rate and measuring the flow rate can be performed separately, and the two operations do not affect each other, thereby making the operations of adjusting the flow rate and measuring the flow rate more accurate.

[0058] The bubble generating device 2 is connected to the middle of the fluid channel 1, so that the bubble E is generated in the middle of the fluid channel 1. Compared with the bubble E being generated at both ends of the fluid channel 1, it is easier for the bubble imaging device 5 to capture the bubble E, thereby making the bubble image clearer. In addition, the bubble generating device 2 can also play a role in supporting the fluid channel 1. Connecting it to the middle of the fluid channel 1 can make the fluid channel 1 more stable than connecting it to both ends of the fluid channel 1, thereby facilitating the experiment.

[0059] It should be noted that the above-mentioned fluid channel 1 can be a circular pipe, a rectangular pipe, or a pipe with other cross-sectional shapes, which is not limited in the embodiments of the present application.

[0060] It should also be noted that the above-mentioned visualization channel 11 refers to a channel that can transmit light, and the light is visible light or invisible light. When it transmits visible light, the visualization channel 11 is a transparent channel. When it is a transparent channel, the transparent channel is made of polycarbonate. Since polycarbonate has a high light transmittance, its light transmittance can reach up to 89%, which is beneficial to the shooting of the bubble imaging device 5, thereby making the bubble image clearer. In addition, polycarbonate has high strength and good impact resistance, which makes the fluid channel 1 more durable.

[0061] It should also be noted that the above-mentioned fluid generating device 3 refers to a device for supplying fluid to the fluid channel 1, which can be a water pipe, an oil pipe, a water tank or an oil tank, and the embodiment of the present application does not limit this.

[0062] It should also be noted that the above-mentioned flow rate regulating component 41 can be a flow rate regulating valve or a flow rate regulating sensor, and the above-mentioned flow rate measuring component 42 can be a flow rate measuring meter or a flow rate measuring sensor, which is not limited in the embodiment of the present application.

[0063] It should also be noted that the above-mentioned bubble imaging device 5 includes an image recognition module, which can recognize the photo of the bubble sliding as the bubble image based on multiple continuously taken photos. The specific implementation method is: the image recognition module first recognizes the distance between the bubble E in the photo and the position where the bubble E is generated, and then selects the photo in which the bubble E is separated from the position where the bubble E is generated but the distance between the two is the smallest as the bubble image.

[0064] It should also be noted that the processor 6 has been subjected to deep learning in advance and trained with a large amount of data through a neural network model, so that the processor 6 has the ability to autonomously recognize images. It can generate a complete image based on a part of a regular image.

[0065] In order to make it easier to adjust the angle of the bubble E, the fluid channel 1 includes multiple fluid channels 1, and different fluid channels 1 have different inner walls coated with different coatings at the locations where bubbles are generated. Different coatings have different hydrophilicity and hydrophobicity, so when the same bubble E contacts different coatings, the angle of the bubble E is different. When different fluid channels 1 are replaced in the experimental device, the angle of the corresponding bubble E will also change.

[0066] In addition, a heating device may be provided at the location where bubbles are generated in the fluid channel 1. Since the higher the temperature of the fluid channel 1, the more intense the thermal motion of the liquid molecules, the easier it is for the liquid molecules to overcome the adsorption force of the solid surface and to spread on the solid surface, the angle of the bubble E can be changed. In order to facilitate the control of the heating temperature, a temperature measuring device may be provided at the heating location of the fluid channel 1. In this way, the heating device may be adjusted by the temperature reading of the temperature measuring device, thereby changing the angle of the bubble E.

[0067] It should be noted that the above-mentioned coating may be vegetable oil, paint, or other types of coatings, which is not limited in the embodiments of the present application.

[0068] It should also be noted that the above-mentioned heating device can be an alcohol lamp, an electric heating wire, or other types of heating devices, and the embodiments of the present application are not limited to this.

[0069] It should also be noted that the above-mentioned temperature measuring device can be a thermometer or a temperature sensor, and the embodiments of the present application are not limited to this.

[0070] In some embodiments, see Figure 1The experimental device 100 for studying the slippage of the bubble E also includes an automatic controller 7, which is connected to the bubble generating device 2 and is used to automatically control the operation of the bubble generating device 2. Since automatic control is more efficient and has higher control accuracy than manual control, the accuracy of the experiment can be improved, and the relevant parameters obtained can be more accurate, and the efficiency of the experiment can be improved.

[0071] And / or, the automatic controller 7 is connected to the fluid generating device 3 and is used to automatically control the operation of the fluid generating device 3; and / or, the automatic controller 7 is connected to the flow rate regulating and measuring device 4 and is used to automatically control the operation of the flow rate regulating and measuring device 4; and / or, the automatic controller 7 is connected to the bubble imaging device 5 and is used to automatically control the operation of the bubble imaging device 5. The corresponding technical effects are the same as the above technical effects, so they are not repeated here.

[0072] In some embodiments, see Figure 1 The experimental device 100 for studying bubble slip also includes a first telescopic device 8 and a second telescopic device 9. When conducting the experiment, the first telescopic device 8 and the second telescopic device 9 are respectively connected to different positions along the axial direction of the fluid channel 1.

[0073] Among them, the first telescopic device 8 and the second telescopic device 9 can be extended or shortened along the axial direction, so when the two are set in a horizontal plane, the height of the two can be adjusted. In addition, since the first telescopic device 8 and the second telescopic device 9 are respectively connected to different positions along the axial direction of the fluid channel 1, the first telescopic device 8 and the second telescopic device 9 can fix the fluid channel 1 according to the principle that two points determine a straight line. Therefore, the angle of the fluid channel 1 can be flexibly adjusted by the first telescopic device 8 and the second telescopic device 9, making the angle adjustment of the fluid channel 1 more convenient, thereby improving the efficiency of the experiment.

[0074] In some embodiments, see Figure 1 , the first telescopic device 8 and / or the second telescopic device 9 are provided with scales along the telescopic direction. Since the angle of the fluid channel 1 depends on the horizontal distance between the first telescopic device 8 and the second telescopic device 9 and the scale difference between the two, the horizontal distance between the first telescopic device 8 and the second telescopic device 9 and the scale difference between the two are recorded each time the angle of the fluid channel 1 is adjusted, that is, the horizontal distance between the first telescopic device 8 and the second telescopic device 9 and the scale difference between the two correspond to the angle of the fluid channel 1, so the scale is an intuitive data indicator reflecting the angle of the fluid channel 1, so it is more convenient to study the influence of the fluid channel 1 on the slippage of the bubble E.

[0075] In addition, different angles of the fluid channel 1 will cause different sliding conditions of the bubble, thereby causing different bubble images recognized by the bubble imaging device 5.

[0076] It should be noted that the first telescopic device 8 and the second telescopic device 9 may be telescopic rods, telescopic frames, or other types of telescopic devices, which are not limited in the embodiments of the present application.

[0077] It should also be noted that the above-mentioned scale can be a digital scale or an identification scale equivalent to a number, and the embodiments of the present application do not limit this.

[0078] In some embodiments, see Figure 1 The bubble generating device 2 includes a bubble generating channel 21, a pressure regulating member 22 and a flow meter 23, and the pressure regulating member 22 and the flow meter 23 are connected through the bubble generating channel 21. The pressure regulating member 22 can adjust the pressure of the medium generating the bubble E, and the flow meter 23 can measure the flow of the medium passing through the flow meter 23 and used to generate the bubble E, thereby being able to control the amount of the medium used to generate a single bubble E. The greater the pressure of the medium or the greater the amount of the medium used for a single bubble E, the greater the volume of the generated bubble E. Specifically, there is a corresponding relationship between the pressure of the medium and the amount of the medium used for a single bubble E and the volume of the bubble E, so the volume of the generated bubble E can be controlled by controlling the pressure of the medium and the amount of the medium used for a single bubble E.

[0079] In order to more accurately control the volume of the generated bubble E, the bubble generation channel 21 is provided with a precision regulating valve 24, and the precision regulating valve 24 can more accurately control the pressure of the medium. In addition, the bubble generation channel 21 is also provided with a switch 25, and the switch 25 is connected to the automatic controller 7, so that the experimental device 100 can automatically control the start and stop of the bubble generation device 2.

[0080] In order to make the shape of the bubble more regular, a nozzle 26 is provided on the side of the bubble generation channel 21 close to the fluid channel 1. The nozzle 26 can make the shape of the generated bubble E closer to a sphere, so the area of ​​the corresponding complete bubble F can be more accurately obtained through the bubble image, so the equivalent diameter of the bubble E can be calculated more accurately.

[0081] It should be noted that the above medium can be gas or liquid, which is determined according to the needs of the experiment. When the medium is gas, the bubble E is a bubble, and when the medium is liquid, the bubble E is a liquid bubble. When the medium is gas, the pressure regulating member 22 is a gas pressure regulating member, and the flow meter 23 is a gas flow meter 23.

[0082] In some embodiments, see Figure 1The bubble imaging device 5 includes a camera 51. The camera 51 is a high-speed camera 51, which can continuously take multiple photos in a short time, and the frequency of the photos is not less than 15 Hz. Thus, multiple photos can be formed in a short time, so that the bubble image when the bubble E is in the critical slip state can be found more accurately, thereby improving the accuracy of the experimental conclusion.

[0083] In some embodiments, see Figure 1 The bubble imaging device 5 further includes a background plate 52, which is used to be arranged on the side of the fluid channel 1 away from the camera 51. The background plate 52 is a monochrome background plate 52, and the color of the background plate 52 is different from the color of the fluid and the bubble E, so that the bubble image captured by the bubble imaging device 5 can be presented more clearly, so that the processor 6 can identify the bubble E more clearly, and then the angle and equivalent diameter of the bubble E can be obtained more accurately.

[0084] In order to further increase the clarity of the bubble image, the background plate 52 uses a light-emitting background plate 52. The outline of the bubble image formed by shooting under the effect of light is clearer, so the processor 6 can recognize the bubble image more clearly.

[0085] It should be noted that the background board 52 may be a LED (Light Emitting Diode) backlight board or other types of light-emitting boards, which is not limited in the embodiment of the present application.

[0086] The embodiment of the present application further provides a method for measuring bubble parameters, and the method for measuring bubble parameters uses any one of the experimental devices 100 for studying bubble slip in the above embodiments to conduct experiments.

[0087] Figure 3 is a flow chart of a method for measuring bubble parameters provided in an embodiment of the present application, see Figure 3 , the foam parameter determination method comprises:

[0088] Step 301: Acquire a bubble image.

[0089] The bubble imaging device 5 includes a camera 51 and a background plate 52, and the camera 51 is a high-speed camera. Before shooting, the background plate 52 is first set in parallel to the side of the fluid channel 1 away from the camera 51, and then the high-speed camera 51 is used to continuously take pictures to form multiple photos. Then, the image recognition module recognizes the photo of the bubble E sliding according to the multiple photos as the bubble image, and the specific implementation method is: the image recognition module first recognizes the distance between the bubble E and the position where the bubble E is generated in the photo, and then selects the photo where the bubble E is separated from the position where the bubble E is generated but the distance between the two is the smallest as the bubble E image. Therefore, this step can obtain the bubble image of the bubble E in the sliding state.

[0090] Step 302: Generate the angle and equivalent diameter of the bubble E according to the bubble image; the angle refers to the angle between the tangent of the surface of the bubble E at the contact point with the inner wall and the inner wall, and the equivalent diameter refers to the diameter of a circle equal to the area of ​​the complete bubble F corresponding to the bubble image.

[0091] The processor 6 has the ability to recognize images. After acquiring the bubble image, it can recognize the pixels of the bubble image, generate the angle α of the bubble E and the outline of the complete bubble F according to the arrangement of the pixels, and then generate the equivalent diameter D according to the outline of the complete bubble F.

[0092] When the above-mentioned method for measuring the parameters of the bubble E is used to study the slippage of the bubble E, since the processor 6 can obtain the bubble image and generate the angle and equivalent diameter of the bubble E according to the bubble image, the bubble parameter measuring method can automatically generate the angle and equivalent diameter of the bubble E, thereby improving the efficiency of the experiment. In addition, since the flow rate of the fluid, the volume of the bubble E and the angle of the bubble E are all obtained based on actual experiments, they are more accurate than the above-mentioned data obtained by simulation using simulation software, thereby making the conclusion of the experiment more accurate.

[0093] In some embodiments, see Figure 4 , the angle and equivalent diameter of the bubble E are generated according to the bubble image, including:

[0094] Step 401: Acquire a bubble image and identify pixels of the bubble image.

[0095] The bubble image is stored in the form of a two-dimensional array, in which each element corresponds to a pixel data, the value of the pixel data determines the color of the pixel, and the number of pixel data determines the area of ​​the image. When the processor 6 loads the two-dimensional array of the bubble image, the corresponding pixel data can be obtained, and then the pixel information of the bubble image can be identified, including the arrangement of the pixels and the number of pixels.

[0096] Step 402: Generate a first virtual outline G of the bubble E according to the pixel arrangement and distribution of the bubble image.

[0097] After the processor 6 recognizes the pixel data of the two-dimensional array, it analyzes the pixel data one by one. When the value of the pixel data changes suddenly, the pixel point corresponding to the pixel data is the pixel point on the edge of the bubble E. The first virtual contour G can be obtained by combining the pixel points on multiple edges.

[0098] It should be noted that the first virtual outline G is the actual existing outline of the bubble E, which is located on one side of the inner wall of the fluid channel 1 and is generally an arc with a length less than a semicircle.

[0099] Step 403: Generate the angle α of the bubble E according to the first virtual contour G.

[0100] The processor 6 first generates a tangent line of the surface of the bulb E at the contact point with the inner wall according to the first virtual contour G, and then identifies the angle between the tangent line and the inner wall to obtain the angle α of the bulb E.

[0101] Step 404: Generate a second virtual outline H of the complete bulb F corresponding to the bulb E according to the first virtual outline G.

[0102] This process utilizes the method of mathematical modeling. The specific process is to establish a mathematical model based on multiple pixel points on the first virtual contour G, and then obtain multiple pixel points on the outside of the fluid channel 1 based on the mathematical model. The multiple pixel points on the outside of the fluid channel 1 are combined to obtain the second virtual contour H.

[0103] It should be noted that the second virtual contour H does not exist in actual experiments, but is introduced to facilitate the calculation of the area of ​​the complete bubble F. The image enclosed by the second virtual contour H is the image of the complete bubble F, so it is more convenient to calculate the equivalent diameter D.

[0104] Step 405: Generate the area S of the complete bubble F according to the second virtual outline H.

[0105] With the second virtual contour as the boundary, the processor 6 can identify all the pixel points inside the second virtual contour H and generate a two-dimensional array. Then the processor 6 loads the two-dimensional array to obtain the number of pixel data, and then the number of pixel points can be obtained. The area S of the complete bubble F is obtained by multiplying the number of pixel points by the area of ​​a single pixel.

[0106] Step 406: Calculate the equivalent diameter D according to the area S.

[0107] Since the equivalent diameter refers to the diameter of a circle having the same area as the complete bubble F corresponding to the bubble image, the equivalent diameter D can be calculated according to the area S according to the following formula.

[0108]

[0109] In some embodiments, generating a second virtual outline H of a complete bulb F corresponding to the bulb E according to the first virtual outline G includes:

[0110] Step 501: Establish a coordinate system based on the bubble image.

[0111] A coordinate system is established with any point on the bubble image as the origin. The coordinates of any point on the bubble image can be obtained through the coordinate system. It should be noted that the coordinate system can be a rectangular coordinate system or a polar coordinate system, which is not limited in the embodiments of the present application. When it is a rectangular coordinate system, the above coordinates include a horizontal coordinate value and a vertical coordinate value. When it is a polar coordinate system, the above coordinates include a distance coordinate value and an angle coordinate value.

[0112] Step 502: Acquire a plurality of first contour points on the first virtual contour G.

[0113] A plurality of points are randomly selected from the first virtual contour G as first contour points, and then the coordinates of the first contour points in the coordinate system are obtained, and the number of the coordinates is at least three points.

[0114] Step 503: Establishing a mathematical model of the complete bubble F according to the plurality of first contour points.

[0115] The coordinates of the first contour points are used to establish a mathematical model, which can be a curve equation or a geometric model, which is not limited in the present embodiment. When it is a curve equation, the coordinates of any point on the curve equation can be obtained through the curve equation.

[0116] Step 504: generating a plurality of second contour points according to the mathematical model;

[0117] At least three second contour points near the outer side of the fluid channel 11 are selected according to the above mathematical model, and the coordinates of each second contour point are obtained.

[0118] When the mathematical model is a curve equation, a horizontal coordinate value within the curve range is selected, and the horizontal coordinate value is substituted into the curve equation to calculate the corresponding vertical coordinate value, so as to obtain the coordinates of a second contour point. Repeating the above process multiple times can obtain at least three second contour points.

[0119] Step 505: Generate a second virtual contour H according to a plurality of second contour points.

[0120] The curve equation of the circle is established, and the coordinates of the plurality of second contour points are substituted into the curve equation of the circle for calculation and solution to obtain a definite circular trajectory equation, and the corresponding circular trajectory is the second virtual contour H.

[0121] It should be noted that the second virtual outline H and the first virtual outline G are both arcs and the second virtual outline H includes the first virtual outline G, that is, the figure enclosed by the second virtual outline H is a complete bubble F.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An experimental device for studying bubble slip, characterized in that: include: A fluid channel, the fluid channel comprising a visualization channel, the inclination of the fluid channel being adjustable, and the fluid channel being used for fluid flow; A bubble generating device, the bubble generating device is connected to the fluid channel and is used to generate bubbles of different sizes on one side of the inner wall of the fluid channel at the connection point; a fluid generating device, the fluid generating device being in communication with one end of the fluid channel and being used for providing fluid to the fluid channel; A flow rate regulating and measuring device, the flow rate regulating and measuring device is used to regulate and measure the flow rate of the fluid; A bubble imaging device, the bubble imaging device is used to photograph the bubble to form a bubble image; a processor, the processor being connected to the bubble imaging device, and being used for acquiring the bubble image and generating an angle and an equivalent diameter of the bubble according to the bubble image, wherein the angle refers to an angle between a tangent line of the bubble surface at a contact point with the inner wall and the inner wall, and the equivalent diameter refers to a diameter of a circle having an area equal to that of the complete bubble corresponding to the bubble image; The bubble imaging device includes an image recognition module, and the image recognition module is used to recognize a photo of the bubble sliding as the bubble image based on a plurality of continuously taken photos; The processor is further configured to generate a complete image based on a portion of the image having a regularity; Wherein, generating the angle and equivalent diameter of the bubble according to the bubble image includes: Acquiring the bubble image and identifying pixels of the bubble image; Generate a first virtual outline of the bubble according to the pixel arrangement and distribution of the bubble image; the first virtual outline is the actual existing outline of the bubble, located on one side of the inner wall of the fluid channel; generating an angle α of the bubble according to the first virtual contour; generating a second virtual outline of a complete bulb corresponding to the bulb according to the first virtual outline; Generate an area S of the complete bubble according to the second virtual contour; Based on the area S, the equivalent diameter D is calculated.

2. The experimental device for studying bubble slip according to claim 1, characterized in that: The experimental device for studying bubble slip also includes an automatic controller, which is connected to the bubble generating device and is used to automatically control the operation of the bubble generating device; And / or, the automatic controller is connected to the fluid generating device and is used to automatically control the operation of the fluid generating device; And / or, the automatic controller is connected to the flow rate regulating and measuring device and is used to automatically control the operation of the flow rate regulating and measuring device; And / or, the automatic controller is connected to the bubble imaging device and is used to automatically control the operation of the bubble imaging device.

3. The experimental device for studying bubble slip according to claim 1, characterized in that: The experimental device for studying bubble slip also includes a first telescopic device and a second telescopic device. When conducting an experiment, the first telescopic device and the second telescopic device are respectively connected to different positions of the fluid channel along the axial direction.

4. The experimental device for studying bubble slip according to claim 3, characterized in that: The first telescopic device and / or the second telescopic device are provided with scales along the telescopic direction.

5. The experimental device for studying bubble slip according to claim 1, characterized in that: The bubble generating device comprises a bubble generating channel, a pressure regulating member and a flow meter, and the pressure regulating member and the flow meter are connected through the bubble generating channel.

6. The experimental device for studying bubble slip according to claim 1, characterized in that: The bubble imaging device includes a camera.

7. The experimental device for studying bubble slip according to claim 6, characterized in that: The bubble imaging device further comprises a background plate, and the background plate is used to be arranged on a side of the fluid channel away from the camera.

8. A method for measuring foam parameters, characterized in that: The foam parameter determination method is performed using the experimental device for studying foam slippage according to any one of claims 1 to 7, and the foam parameter determination method comprises: Acquiring the bubble image; The angle and equivalent diameter of the bubble are generated according to the bubble image; the angle refers to the angle between the tangent line of the bubble surface at the contact point with the inner wall and the inner wall, and the equivalent diameter refers to the diameter of a circle having the same area as the complete bubble corresponding to the bubble image; Wherein, generating the angle and equivalent diameter of the bubble according to the bubble image includes: Acquiring the bubble image and identifying pixels of the bubble image; Generating a first virtual outline of the bubble according to the pixel arrangement and distribution of the bubble image; generating an angle α of the bubble according to the first virtual contour; generating a second virtual outline of a complete bulb corresponding to the bulb according to the first virtual outline; Generate an area S of the complete bubble according to the second virtual contour; Based on the area S, the equivalent diameter D is calculated.

9. The method for measuring foam parameters according to claim 8, characterized in that: The processor generates a second virtual outline of a complete bulb corresponding to the bulb according to the first virtual outline, comprising: Establishing a coordinate system based on the bubble image; Acquire a plurality of first contour points on the first virtual contour; Establishing a mathematical model of the complete bubble according to the plurality of the first contour points; generating a plurality of second contour points according to the mathematical model; The second virtual contour is generated according to a plurality of the second contour points.

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