Gas viscosity coefficient measuring device and measuring method

Abstract

The invention relates to the technical field of measuring viscosity coefficient, and in particular to a device for measuring gas viscosity coefficient and a measuring method thereof; a long ventilation tube, a charging unit and a measuring unit are provided, a ventilation hole with a measurable length and inner diameter is provided inside the long ventilation tube, a ventilation port and a liquid dipping port are provided at both ends of the ventilation hole, and the charging unit is connected to the ventilation port; when measuring the gas viscosity coefficient, the long ventilation tube is firstly dipped into a bubble liquid through the liquid dipping port, and then the charging unit is used to fill the long ventilation tube with a gas to be measured, so that the bubble liquid at the liquid dipping port forms a spherical bubble, and then the spherical bubble is degassed in a natural state, the measuring unit obtains the time interval between any two moments in the natural degassing process of the spherical bubble, and the diameter of the spherical bubble corresponding to the two moments, and then the gas viscosity coefficient measurement expression is used to obtain the viscosity coefficient of the gas to be measured, thereby realizing the acquisition of the viscosity coefficient of any gas at a certain temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring viscosity coefficient, and in particular to a gas viscosity coefficient measuring device and a measuring method thereof. Background Art

[0002] The viscosity coefficient of a fluid is also called the internal friction coefficient or viscosity. It is an important physical quantity that describes the friction properties of a fluid. It characterizes the ability of a fluid to resist deformation and is only manifested when there is relative motion within the fluid. In addition to being material-dependent, the viscosity coefficient is also sensitively dependent on temperature. The viscosity coefficient of a liquid decreases as the temperature increases, while the viscosity coefficient of a gas decreases as the temperature increases, and generally increases in direct proportion.

[0003] At present, several traditional methods are still used to measure the viscosity of liquids, such as the capillary method, the cylinder rotation method and the falling ball method. The falling ball method is a simple and convenient experimental technique, and the experimental equipment has low cost and small loss, so it is also the most commonly used experimental method in physical experimental teaching.

[0004] However, there are relatively few existing methods for measuring gas viscosity coefficient. The existing methods generally obtain the dynamic viscosity coefficient at the temperature by using the theoretical relationship between the dynamic viscosity coefficient and temperature, and the relationship is: Among them, the constant C is related to the properties of the gas, η0 refers to the dynamic viscosity of the gas at 0°C, T is the thermodynamic temperature, taking air as an example, C in the air = 122K, η0 = 1.71×10 -5 Pa·s. Although the dynamic viscosity coefficient of a gas at a certain temperature can be obtained through the theoretical relationship between the dynamic viscosity coefficient of a gas and temperature, when measuring the viscosity coefficient of a particular gas, it is difficult to effectively determine the viscosity coefficient of the gas at this temperature without knowing the dynamic viscosity coefficient of the gas at 0°C, which limits the measurement of the viscosity coefficient of the gas. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, propose a gas viscosity coefficient measuring device and a measuring method thereof, and solve the technical problem that the gas viscosity coefficient measuring method in the prior art cannot measure the viscosity coefficient of all gases under a certain temperature state.

[0006] In order to achieve the above technical purpose, the technical solution of the present invention provides a gas viscosity coefficient measuring device, comprising:

[0007] A long ventilation tube, wherein a ventilation hole with a measurable length and inner diameter is arranged inside the long ventilation tube, and a ventilation port and a liquid dipping port are respectively arranged at both ends of the ventilation hole, and the liquid dipping port is used to dip and contain a bubble liquid with a known tension coefficient;

[0008] an air filling unit, the air filling unit being connected to the vent and used for filling the vent hole with the gas to be tested through the vent, so that the bubble liquid in the dipping liquid port forms spherical bubbles, and the spherical bubbles can be naturally deflated when the air filling unit is disconnected from the vent;

[0009] A measuring unit is used to measure the time interval between any two moments in the natural degassing process of the spherical bubble, and the diameter or radius of the spherical bubble corresponding to the two moments.

[0010] Optionally, the measuring unit includes a light source device and a projection device, which are respectively located on both sides of the dipping port, and a projection surface is provided on the projection device. The distance between the light source device and the dipping port is smaller than the distance between the projection surface and the dipping port. The light source device is used to generate a point light source to form an image of the spherical bubble on the projection surface, and the measuring unit is used to obtain the projection diameters of the spherical bubble corresponding to any two moments in a naturally deflated state.

[0011] Optionally, the measuring unit also includes a camera device and a timer, the camera device is arranged on one side of the projection surface, the timer is located within the shooting range of the camera device, the timer is used to time the degassing process of the spherical bubble in a natural state, and the camera device is used to shoot the image of the spherical bubble on the projection surface and the indication of the timer to obtain the projection diameter of the spherical bubble corresponding to any two moments in the natural degassing process.

[0012] Optionally, the measuring unit also includes a light source adjustment frame and a long tube adjustment frame, the light source adjustment frame is located on one side of the long ventilation tube, the light source device is installed on the light source adjustment frame, the long tube adjustment frame is located on one side of the projection device, the long ventilation tube is vertically fixed on the long tube adjustment frame, the light source adjustment frame and the long tube adjustment frame are respectively used to adjust the vertical height of the light source device and the long ventilation tube, so that the line between the center of the light source of the light source device and the center of the spherical bubble can be perpendicular to the projection surface.

[0013] Optionally, the projection device includes a protective box, the long ventilation tube is located inside the protective box, the projection surface is located on the inner wall of the protective box, a light source inlet is provided on the side of the protective box opposite to the projection surface, and the light source is provided outside the protective box and on one side of the light source inlet.

[0014] Optionally, a thermometer is also included, which is installed inside the protective box to measure the ambient temperature when the spherical bubble is naturally deflated.

[0015] Compared with the prior art, the beneficial effects of the gas viscosity coefficient measuring device provided by the present invention include: by setting a long ventilation tube, an inflation unit and a measuring unit, the interior of the long ventilation tube is provided with a ventilation hole whose length and inner diameter can be measured, and the two ends of the ventilation hole are respectively provided with a ventilation port and a dipping port, and the inflation unit is connected to the ventilation port; before measuring the gas viscosity coefficient, first obtain the surface tension coefficient of the bubble liquid, and the inner diameter and length of the long ventilation tube; when measuring the gas viscosity coefficient, first dip the long ventilation tube into the bubble liquid with a known tension coefficient through the dipping port, and then let the inflation unit fill the long ventilation tube with the gas to be measured through the ventilation port, so that the dipping port The bubble liquid is used to form a spherical bubble, which is then degassed in a natural state. At the same time, the measuring unit obtains the time interval between any two moments in the natural degassing process of the spherical bubble, and the diameter of the spherical bubble corresponding to the two moments. Finally, through the data of the length and inner diameter of the vent hole, the tension coefficient of the bubble liquid, the time interval between any two moments in the natural degassing process of the spherical bubble, and the diameter of the spherical bubble corresponding to the two moments measured above, and then using the gas viscosity coefficient measurement expression, the viscosity coefficient of the gas to be measured can be obtained, thereby realizing the acquisition of the viscosity coefficient of any gas at a certain temperature.

[0016] In order to achieve the above technical purpose, the technical solution of the present invention provides a method for measuring gas viscosity coefficient, which is performed by the above gas viscosity coefficient measuring device and includes the following steps:

[0017] S100: Dip the long ventilation tube into the bubble liquid with known tension coefficient through the dipping port;

[0018] S200: the gas filling unit fills the long ventilation tube with the gas to be tested through the vent, so that the bubble liquid at the dipping port forms spherical bubbles;

[0019] S300: the inflation unit is separated from the vent, so that the spherical bubble is deflated in a natural state, and the measuring unit obtains the time interval between any two moments in the natural deflation process of the spherical bubble, and the diameter or radius of the spherical bubble corresponding to the two moments respectively;

[0020] S400: Obtaining the viscosity coefficient of the gas to be measured using a gas viscosity coefficient measurement expression.

[0021] Optionally, in step S200, the light source device generates a point light source and irradiates the spherical bubble to form a projection on the projection surface, and in S300, the projection diameters of the spherical bubble corresponding to any two moments in the natural degassing state are obtained by the measuring unit.

[0022] Optionally, in S300, the camera device captures the indication of the timer and the image of the spherical bubble in a naturally deflated state, so as to obtain the projection diameters of the spherical bubble corresponding to any two moments in the natural deflation process.

[0023] Optionally, before step S300, the heights of the ventilation long tube and the light source device are adjusted respectively by a light source adjustment frame and a long tube adjustment frame so that a line between the light source center of the light source device and the center of the spherical bubble is perpendicular to the projection surface.

[0024] Compared with the prior art, the beneficial effects of the gas viscosity coefficient determination method provided by the present invention include: by measuring the length and inner diameter of the vent hole, the tension coefficient of the bubble liquid, the time interval between any two moments in the natural degassing process of the spherical bubble, and the diameter of the spherical bubble corresponding to the two moments, and then using the gas viscosity coefficient measurement expression, the viscosity coefficient of the gas to be measured can be obtained, thereby realizing the acquisition of the viscosity coefficient of any gas at a certain temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of the gas viscosity coefficient measuring device provided in Example 1 of the present invention.

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the camera equipment hidden in the gas viscosity coefficient measuring device.

[0027] Figure 3 This is a flow chart of the method for measuring gas viscosity coefficient provided in Example 2 of the present invention.

[0028] Among them, the reference numerals in the figure are:

[0029] 10—Ventilation tube 11—Ventilation port 12—Liquid dipping port

[0030] 20 - Inflatable unit 21 - Ventilation hose 30 - Measuring unit

[0031] 31—Light source equipment 32—Screen projection equipment 33—Camera equipment

[0032] 34—light source adjustment frame 35—long tube adjustment frame 321—projection surface

[0033] 322—protective box 3211—grid paper 10a—spherical bubble

[0034] 11a—Image of a spherical bubble. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] The invention provides a gas viscosity coefficient measuring device and a measuring method thereof.

[0037] Embodiment 1:

[0038] Embodiment 1 of the present invention provides a gas viscosity coefficient measuring device, including a long ventilation tube 10, an inflation unit 20 and a measuring unit 30. The interior of the long ventilation tube 10 is provided with a ventilation hole whose length and inner diameter can be measured. A ventilation hole 11 and a dipping port 12 are respectively provided at both ends of the ventilation hole. The dipping port 12 is used to dip and contain bubble liquid with a known tension coefficient. The inflation unit 20 is connected to the ventilation hole 11, so as to fill the ventilation hole with a gas to be measured through the ventilation hole 11, so that the bubble liquid in the dipping port 12 forms a spherical bubble 10a, and the spherical bubble 10a can be naturally deflated when the inflation unit 20 is disconnected from the ventilation hole 11. The measuring unit 30 is used to measure the time interval between any two moments in the natural deflation process of the spherical bubble 10a, and the diameter or radius of the spherical bubble 10a corresponding to the two moments.

[0039] Specifically, a long ventilation tube 10, an inflation unit 20 and a measuring unit 30 are provided, the interior of the long ventilation tube 10 is provided with a ventilation hole whose length and inner diameter can be measured, a ventilation port 11 and a liquid dipping port 12 are provided at both ends of the ventilation hole, and the inflation unit 20 is connected to the ventilation port 11. Before measuring the gas viscosity coefficient, the surface tension coefficient α of the bubble liquid is first measured by a Joule balance or other equipment, and the inner diameter D and length L of the long ventilation tube 10 are obtained by measurement or other methods.

[0040] When measuring the gas adhesion coefficient, first, the long ventilation tube 10 is dipped into the bubble liquid with a known tension coefficient α through the dipping port 12, and then the inflation unit 20 is used to fill the long ventilation tube 10 with the gas to be tested through the vent 11, so that the bubble liquid in the dipping port 12 forms a spherical bubble 10a, and then the spherical bubble 10a is degassed in a natural state. At the same time, the measuring unit 30 obtains the time interval t between any two moments in the natural degassing process of the spherical bubble 10a, and the diameters d0 and d or the radii r0 and r of the spherical bubble 10a corresponding to the two moments respectively.

[0041] According to theoretical analysis, there is a certain specific relationship between the gas adhesion coefficient η and the tension coefficient α of the bubble liquid, the time interval t between any two moments of the spherical bubble 10a during the natural degassing process, and the diameters d0 and d or the radii r0 and r of the spherical bubble 10a corresponding to the two moments, respectively. The specific relationship expression is: or

[0042] By substituting the length L and inner diameter D of the vent hole, the tension coefficient α of the bubble liquid, the time interval t between any two moments in the natural degassing process of the spherical bubble 10a, and the diameter d0 and d or the radius r0 and r of the spherical bubble 10a corresponding to the two moments respectively measured above into the above expression, the viscosity coefficient η of the measured gas can be obtained, thereby realizing the determination of the viscosity coefficient of any gas at a certain temperature.

[0043] In the present embodiment, the vent holes run through both ends of the long ventilation tube 10, and the length and inner diameter of the vent holes need to be adaptively adjusted according to the cost of the bubble liquid and the surface tension of the bubble liquid, so that when the long ventilation tube 10 is dipped in the bubble liquid, a liquid column can be formed at the dipping port 12, and during the inflation process of the inflation unit 20, regular spherical bubbles 10a can be formed at the dipping port 12 by blowing air into the liquid column.

[0044] In this embodiment, the foaming liquid used is a saturated solution of white sugar, laundry detergent, and shampoo dissolved in distilled water.

[0045] In this embodiment, the inflation unit 20 is an air pump (not marked in the figure) provided with a ventilation hose 21. The air pump is mounted on one end of the ventilation tube 10 where the vent 11 is provided through the ventilation hose 21. When the ventilation tube 10 is needed, the air pump is turned on, and the ventilation tube 10 is inflated through the ventilation hose 21, so that the liquid column forms a regular spherical bubble 10a. When the spherical bubble 10a increases to a certain extent, the ventilation hose 21 is pulled out to achieve natural degassing of the spherical bubble 10a.

[0046] In this embodiment, in order to facilitate the measurement of the diameter or radius of the spherical bubble 10a, the measuring unit 30 includes a light source device 31 and a projection device 32. The light source device 31 and the projection device 32 are respectively located on both sides of the dipping port 12. A projection surface 321 is provided on the projection device 32. The distance between the light source device 31 and the dipping port 12 is smaller than the distance between the projection surface 321 and the dipping port 12. The light source device 31 is used to generate a point light source to form an image 11a of the spherical bubble on the projection surface 321. The measuring unit 30 is used to obtain the projection diameters corresponding to any two moments of the spherical bubble 10a in the natural degassing state. Specifically, when measuring the diameter or radius of the spherical bubble 10a, the light source device 31 generates a point light source to illuminate the spherical bubble 10a, and illuminates the image 11a of the spherical bubble onto the projection surface 321. The diameter or radius of the spherical bubble 10a can be obtained by measuring the distance between the point light source and the center of the spherical bubble 10a, the distance between the center of the spherical bubble 10a and the projection surface 321, and the diameter or radius of the image 11a of the spherical bubble. The time corresponding to the diameter or radius of the spherical bubble 10a can then be obtained.

[0047] In this embodiment, the long ventilation tube 10 is vertically arranged and parallel to the projection surface 321. Through this arrangement, it is only necessary to measure the distance between the point light source and the axis of the ventilation hole, and the distance between the axis of the ventilation hole and the projection surface 321, so as to respectively obtain the distance between the point light source and the center of the spherical bubble 10a, and the distance between the center of the spherical bubble 10a and the projection surface 321. Through this arrangement, the distance between the point light source and the center of the spherical bubble 10a, and the distance between the center of the spherical bubble 10a and the projection surface 321 can be measured before the spherical bubble 10a is formed, thereby reducing the measurement error of the diameter or radius of the spherical bubble 10a.

[0048] In this embodiment, further, in order to facilitate the measurement of the diameter or radius of the image 11 a of the spherical bubble, a grid paper 3211 with uniform scales is provided on the projection surface 321 .

[0049] In this embodiment, in order to facilitate the establishment of the diameter of the image 11a of the spherical bubble on the projection surface 321 at any two moments and the corresponding moments under the diameter, the measuring unit 30 also includes a camera device 33 and a timer (not shown in the figure), the camera device 33 is arranged on one side of the projection surface 321, the timer is located within the shooting range of the camera device 33, the timer is used to time the degassing process of the spherical bubble 10a in a natural state, and the camera device 33 is used to shoot the image 11a of the spherical bubble on the projection surface 321 and the indication of the timer to obtain the projection diameter corresponding to any two moments of the spherical bubble 10a in the natural degassing process. Specifically, when the spherical bubble 10a is in a natural degassing state, the camera device 33 shoots the image 11a of the spherical bubble on the projection surface 321 and the indication of the timer to obtain the diameter or radius of the image 11a of the spherical bubble at any establishment moment.

[0050] It can be understood that the camera device 33 is a video camera, which is used to establish the relationship between the diameter change and time of the spherical bubble 10a during the entire process of natural degassing. Then, multiple sets of data at any time interval are selected and substituted to reduce the measurement error.

[0051] Optionally, the measuring unit 30 also includes a light source adjustment frame 34 and a long tube adjustment frame 35, the light source adjustment frame 34 is located on one side of the long ventilation tube 10, the light source device 31 is mounted on the light source adjustment frame 34, the long tube adjustment frame 35 is located on one side of the projection device 32, the long ventilation tube 10 is vertically fixed on the long tube adjustment frame 35, the light source adjustment frame 34 and the long tube adjustment frame 35 are respectively used to adjust the vertical height of the light source device 31 and the long ventilation tube 10, so that the line between the center of the light source of the light source device 31 and the center of the spherical bubble 10a can be perpendicular to the projection surface 321. Specifically, by setting up the light source adjustment bracket 34 and the long tube adjustment bracket 35, the height of the light source device 31 and the ventilation long tube 10 can be conveniently adjusted, and the line between the light source center of the light source device 31 and the center of the spherical bubble 10a can be perpendicular to the projection surface 321, so as to reduce the error between the projection shape of the spherical bubble 10a and the main body shape of the spherical bubble 10a, thereby reducing the measurement error of the diameter or radius of the spherical bubble 10a.

[0052] Optionally, the projection device 32 includes a protective box 322, the long ventilation tube 10 is located inside the protective box 322, the projection surface 321 is located on the inner wall of the protective box 322, and a light source inlet is provided on the side of the protective box 322 opposite to the projection surface 321, and the light source is provided outside the protective box 322 and on one side of the light source inlet. Specifically, the protective box 322 can not only receive the image 11a of the spherical bubble, but also reduce the interference of the external environment on the spherical bubble 10a, thereby reducing the experimental error.

[0053] Optionally, a thermometer (not shown in the figure) is also included, which is installed inside the protective box 322 to measure the ambient temperature when the spherical bubble 10a is naturally deflated. Specifically, by measuring the ambient temperature with the thermometer, the viscosity coefficient of the measured gas at the temperature can be obtained. If the viscosity coefficient of the measured gas at 0°C and the measured gas constant C are known;

[0054] According to the theoretical expression of gas viscosity coefficient: Where C is the constant of the gas, which is related to the properties of the gas, η0 refers to the dynamic viscosity of the gas at 0°C, T is the thermodynamic temperature, for air, C = 122K, η0 = 1.71×10 -5 Pa·s.

[0055] By substituting the temperature, the viscosity coefficient of the measured gas at 0°C, and the measured gas constant C into the formula, the theoretical viscosity coefficient value of the measured gas at this temperature can be obtained. The theoretical viscosity coefficient value can be compared with the actual measured viscosity coefficient value to analyze the achieved results.

[0056] Embodiment 2:

[0057] Embodiment 2 of the present invention provides a method for measuring gas viscosity coefficient, which is performed by the above-mentioned gas viscosity coefficient measuring device and includes the following steps:

[0058] S100: Dipping the long ventilation tube 10 into the bubble liquid with a known tension coefficient through the dipping port 12;

[0059] S200: The gas filling unit 20 fills the long ventilation tube 10 with the gas to be tested through the vent 11, so that the bubble liquid in the dipping port 12 forms a spherical bubble 10a;

[0060] S300: the inflation unit 20 is separated from the vent 11, so that the spherical bubble 10a is deflated in a natural state, and the measuring unit 30 obtains the time interval between any two moments in the natural deflation process of the spherical bubble 10a, and the diameters or radii of the spherical bubble 10a corresponding to the two moments respectively;

[0061] S400: Obtain the viscosity coefficient of the gas to be measured by using a gas viscosity coefficient measurement expression.

[0062] Specifically, by measuring the length and inner diameter of the vent hole, the tension coefficient of the bubble liquid, the time interval between any two moments in the natural degassing process of the spherical bubble 10a, and the diameter of the spherical bubble 10a corresponding to the two moments, and then using the gas viscosity coefficient measurement expression, the viscosity coefficient of the gas to be measured can be obtained, thereby realizing the acquisition of the viscosity coefficient of any gas at a certain temperature.

[0063] Optionally, in step S200, the light source device 31 generates a point light source and irradiates the spherical bubble 10a so that the spherical bubble forms a projection on the projection surface 321, and in S400, the projection diameter corresponding to any two moments of the spherical bubble 10a in the natural degassing state is obtained by the measuring unit 30.

[0064] Optionally, in S400, the camera device 33 photographs the indication of the timer and the image 11a of the spherical bubble in the natural deflation state to obtain the projection diameters of the spherical bubble 10a corresponding to any two moments in the natural deflation process.

[0065] Optionally, before step S400, the heights of the ventilation long tube 10 and the light source device 31 are adjusted respectively by the light source adjustment frame 34 and the long tube adjustment frame 35 so that the line between the light source center of the light source device 31 and the center of the spherical bubble 10a is perpendicular to the projection surface 321.

[0066] The specific working process of the present invention is as follows: before conducting the experiment of measuring the viscosity coefficient of the gas to be measured, firstly, the long ventilation tube 10 is dipped into the bubble liquid through the dipping port 12, and then the long ventilation tube 10 is fixed to the long tube fixing frame, and firstly, the height of the long tube and the height of the light source device are adjusted through the long tube fixing frame and the light source fixing frame, so that the line between the light source center of the light source device 31 and the center of the spherical bubble 10a is kept as vertical as possible with the grid paper 3211 on the projection surface 321, and then the distance between the point light source center of the light source device 31 and the center of the spherical bubble 10a, and the distance between the center of the spherical bubble 10a and the projection surface 321 are measured, and then the gas is fixed. The ventilation hose 21 of the pump is connected to the ventilation end of the vent, and then the air pump inflates the vent through the ventilation hose 21 to make the bubble liquid form a spherical bubble 10a, and then turn on the light source device 31, the camera device 33 and the timer. The light source device 31 projects the image 11a of the spherical bubble onto the grid paper 3211, and then the ventilation hose 21 is removed from the ventilation end of the vent to allow the spherical bubble 10a to deflate naturally. The camera device 33 and the timer record the projection and corresponding time of the spherical bubble 10a when it deflates naturally until the spherical bubble 10a disappears, and finally the viscosity coefficient of the gas to be tested is measured by calculating the obtained data.

[0067] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A gas viscosity coefficient measuring device, characterized in that: include: A long ventilation tube, wherein a ventilation hole with a measurable length and inner diameter is arranged inside the long ventilation tube, and a ventilation port and a liquid dipping port are respectively arranged at both ends of the ventilation hole, and the liquid dipping port is used to dip and contain a bubble liquid with a known tension coefficient; an air filling unit, the air filling unit being connected to the vent and used for filling the vent hole with the gas to be tested through the vent, so that the bubble liquid in the dipping liquid port forms spherical bubbles, and the spherical bubbles can be naturally deflated when the air filling unit is disconnected from the vent; A measuring unit, the measuring unit is used to measure the time interval between any two moments in the natural degassing process of the spherical bubble, and the diameter or radius of the spherical bubble corresponding to the two moments respectively; The measuring unit includes a light source device and a screen projection device, the light source device and the screen projection device are respectively located on both sides of the dipping port, a projection surface is provided on the screen projection device, the distance between the light source device and the dipping port is smaller than the distance between the projection surface and the dipping port, the light source device is used to generate a point light source to form an image of the spherical bubble on the projection surface, and the measuring unit is used to obtain the projection diameters of the spherical bubble corresponding to any two moments in a naturally deflated state; The measuring unit also includes a light source adjustment frame and a long tube adjustment frame, the light source adjustment frame is located on one side of the long ventilation tube, the light source device is installed on the light source adjustment frame, the long tube adjustment frame is located on one side of the projection device, the long ventilation tube is vertically fixed on the long tube adjustment frame, the light source adjustment frame and the long tube adjustment frame are respectively used to adjust the vertical height of the light source device and the long ventilation tube, so that the line between the center of the light source of the light source device and the center of the spherical bubble can be perpendicular to the projection surface.

2. The gas viscosity coefficient measuring device according to claim 1, characterized in that: The measuring unit also includes a camera device and a timer. The camera device is arranged on one side of the projection surface. The timer is located within the shooting range of the camera device. The timer is used to time the degassing process of the spherical bubble in a natural state. The camera device is used to shoot the image of the spherical bubble on the projection surface and the indication of the timer to obtain the projection diameter corresponding to any two moments of the spherical bubble in the natural degassing process.

3. The gas viscosity coefficient measuring device according to claim 1, characterized in that: The projection device includes a protective box, the long ventilation tube is located inside the protective box, the projection surface is located on the inner wall of the protective box, a light source inlet is provided on the side of the protective box opposite to the projection surface, and the light source is provided outside the protective box and on one side of the light source inlet.

4. The gas viscosity coefficient measuring device according to claim 3, characterized in that: It also includes a thermometer, which is installed inside the protection box and is used to measure the ambient temperature when the spherical bubble is naturally deflated.

5. A method for measuring gas viscosity coefficient, characterized in that: The method is performed by the gas viscosity coefficient measuring device according to claim 1, comprising the following steps: S100: Dip the long ventilation tube into the bubble liquid with known tension coefficient through the dipping port; S200: the gas filling unit fills the long ventilation tube with the gas to be tested through the vent, so that the bubble liquid at the dipping port forms spherical bubbles; S300: the inflation unit is separated from the vent, so that the spherical bubble is deflated in a natural state, and the measuring unit obtains the time interval between any two moments in the natural deflation process of the spherical bubble, and the diameter or radius of the spherical bubble corresponding to the two moments respectively; S400: Obtaining the viscosity coefficient of the gas to be measured using a gas viscosity coefficient measurement expression.

6. The method for measuring gas viscosity coefficient according to claim 5, characterized in that: In step S200, a light source device generates a point light source and irradiates a spherical bubble to form a projection on a projection surface, and in step S300, a measurement unit is used to obtain projection diameters of the spherical bubble at any two moments in a naturally degassed state.

7. The method for measuring gas viscosity coefficient according to claim 5, characterized in that: In S300, the camera device captures the indication of the timer and the image of the spherical bubble in the natural deflation state to obtain the projection diameters of the spherical bubble corresponding to any two moments in the natural deflation process.

8. The method for measuring gas viscosity coefficient according to claim 5, characterized in that: Before step S300, the heights of the ventilation long tube and the light source device are adjusted respectively by a light source adjustment frame and a long tube adjustment frame so that the line between the light source center of the light source device and the center of the spherical bubble is perpendicular to the projection surface.

Images