A device for studying particle migration and blockage in porous media under the action of fluid

Abstract

The utility model discloses a device for studying particle migration and blockage in a porous medium under the action of a fluid, including an observation tube body, a PIV visualization detection system, a water supply tank and a circulating water tank, a first metal mesh is fixedly arranged on the top side of the inner part of the observation tube body, a second metal mesh can adjust the horizontal height inside the observation tube body, a transparent porous medium layer is arranged between the first metal mesh and the second metal mesh, the PIV visualization detection system includes a light source, a high-speed camera, and a computer, the computer is electrically connected to the high-speed camera, the light source and the high-speed camera are aimed at the observation tube body, a first water inlet pipe is arranged on one side of the bottom of the water supply tank, the other end of the first water inlet pipe is connected to the top of the observation tube body, a second water inlet pipe is arranged at the center of the bottom of the water supply tank, a shower is arranged on the inner top of the observation tube body, and the other end of the second water inlet pipe is connected to the shower. The utility model allows intuitive observation of particle migration and blockage in a porous medium, improving the observation and teaching practicality of the experiment.

Description

Technical Field

[0001] The utility model relates to the field of experimental teaching aids, in particular to a device for studying particle migration and blockage in a porous medium under the action of a fluid. Background Art

[0002] The migration and movement of fine particles in porous media under the action of seepage involves many engineering fields. For example, under the action of seepage, fine particles in the soil migrate from the load-bearing skeleton to produce internal erosion, leading to problems such as pipe bursts and ground subsidence; the interception and accumulation of fine particles in porous media will cause blockage of artificial infiltration facilities such as the anti-filtration layer of groundwater recharge, the infiltration road surface of rainwater infiltration, and the underground sewage infiltration treatment system, thereby reducing the purification efficiency of artificial infiltration facilities and even eventually failing. Therefore, studying the migration and blockage laws of particles in porous media under seepage conditions is of great significance for preventing engineering disasters and improving the purification effect of artificial infiltration facilities. Utility Model Content

[0003] The purpose of the utility model is to provide a device for studying particle migration and blockage in porous media under the action of fluid in order to solve the above problems.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] The utility model discloses a device for studying particle migration and blockage in a porous medium under the action of a fluid, comprising an observation tube body, a PIV visualization detection system, a water supply tank and a circulating water tank, wherein a first metal mesh is fixedly arranged on the top side of the inner part of the observation tube body, a metal plate is arranged at the top center of the first metal mesh, a particle fine material layer is arranged on the top of the metal plate, a second metal mesh is arranged on the bottom side of the first metal mesh, the second metal mesh can adjust the horizontal height inside the observation tube body, a transparent porous medium layer is arranged between the first metal mesh and the second metal mesh, the PIV visualization detection system comprises a light source, a high-speed camera and a computer, the computer is electrically connected to the high-speed camera, the light source and the high-speed camera are aimed at the observation tube body, the water supply tank is provided with a plurality of holes, and the plurality of holes are provided with a plurality of holes. A first water inlet pipe is provided on one side of the bottom of the box, and the other end of the first water inlet pipe is connected to the top of the observation tube body. A second water inlet pipe is provided in the center of the bottom of the water supply tank, and a shower is provided at the top of the inner top of the observation tube body, and the other end of the second water inlet pipe is connected to the shower. A first water outlet pipe is provided on one side of the top of the observation tube body, and one end of the first water outlet pipe is connected to a circulating water tank. A second water outlet pipe is provided on one side of the bottom of the observation tube body, and the other end of the second water outlet pipe is connected to the circulating water tank. A circulating pump is connected to one end of the circulating pump, and a return pipe is provided at one end of the circulating pump, and the other end of the return pipe is connected to the water supply tank. One end of the circulating pump is connected to the bottom of the observation tube body through a connecting pipe.

[0006] As an optimal technical solution for studying the migration and blockage of particles in porous media under the action of fluid, the horizontal heights of the connections between the first water inlet pipe, the first water outlet pipe and the observation tube body are flush with the surface of the particle fine material layer.

[0007] As an optimal technical solution of the utility model for studying the migration and blockage of particles in a porous medium under the action of fluid, a detachable base is provided at the bottom of the observation tube body.

[0008] As an optimal technical solution for studying the migration and blockage device of particles in a porous medium under the action of fluid in the utility model, a first flow controller and a first valve are connected to the middle of the first water inlet pipe.

[0009] As an optimal technical solution for studying the migration and blockage device of particles in porous media under the action of fluid in the utility model, a second flow controller and a second valve are connected to the middle of the second water inlet pipe.

[0010] As an optimal technical solution for studying the particle migration and blockage device in a porous medium under the action of fluid in the utility model, a third valve is arranged at the first water outlet pipe, and a filter is arranged in the middle of the first water outlet pipe.

[0011] As an optimal technical solution for studying particle migration and blockage in porous media under the action of fluid in the utility model, a third metal mesh is provided at the connection between the second water outlet pipe and the observation tube body, and a fourth valve is provided in the middle of the second water outlet pipe.

[0012] As an optimal technical solution for studying the migration and blockage of particles in porous media under the action of fluid, the transparent porous medium layer is made of sodium polyacrylate beads, and the meshes of the first metal mesh and the second metal mesh are smaller than the diameter of the sodium polyacrylate beads.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1: Allows intuitive observation of particle migration and blockage in porous media, improving the observability and teaching practicality of the experiment.

[0015] 2. Real-time collection of key parameters such as particulate matter, capable of real-time monitoring of experimental status and in-depth analysis.

[0016] 3. It can simulate the fluid behavior at different flow rates and increase the scope and flexibility of the experiment

[0017] 4. Both horizontal runoff and vertical seepage of water flow can be studied. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the plane structure of the utility model;

[0020] In the figure: 1. Observation tube body; 2. PIV visualization detection system; 3. Water supply tank; 4. Circulating water tank; 5. First metal mesh; 6. Fine particle layer; 7. Second metal mesh; 8. Light source; 9. High-speed camera; 10. Computer; 11. First water inlet pipe; 12. Second water inlet pipe; 13. Shower; 14. First water outlet pipe; 15. Second water outlet pipe; 16. Circulating pump; 17. Return pipe; 18. Base; 19. First flow controller; 20. First valve; 21. Second flow controller; 22. Second valve; 23. Third valve; 24. Filter; 25. Third metal mesh; 26. Fourth valve; 27. Transparent porous medium layer; 28. Metal plate; 29. ​​Connecting pipe. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0022] In the drawings, the same reference numerals all refer to the same components.

[0023] Example 1

[0024] like Figure 1As shown, it includes an observation tube body 1, a PIV visualization detection system 2, a water supply tank 3 and a circulating water tank 4. A first metal mesh 5 is fixedly arranged on the top side of the inner part of the observation tube body 1, a metal plate 28 is arranged at the top center of the first metal mesh 5, a particle fine material layer 6 is arranged on the top of the metal plate 28, a second metal mesh 7 is arranged on the bottom side of the first metal mesh 5, and the second metal mesh 7 can adjust the horizontal height inside the observation tube body 1. A transparent porous medium layer 27 is arranged between the first metal mesh 5 and the second metal mesh 7. The PIV visualization detection system 2 includes a light source 8, a high-speed camera 9, and a computer 10. The computer 10 is electrically connected to the high-speed camera 9. The light source 8 and the high-speed camera 9 are aligned with the observation tube body 1. A first water inlet pipe 11 is arranged on one side of the bottom of the water supply tank 3. The other end of the first water inlet pipe 11 is connected to the top of the observation tube body 1, a second water inlet pipe 12 is arranged in the center of the bottom of the water supply tank 3, a shower head 13 is arranged at the top of the observation tube body 1, and the other end of the second water inlet pipe 12 is connected to the shower head 13, a first water outlet pipe 14 is arranged on one side of the top of the observation tube body 1, one end of the first water outlet pipe 14 is connected to the circulating water tank 4, a second water outlet pipe 15 is arranged on one side of the bottom of the observation tube body 1, and the other end of the second water outlet pipe 15 is connected to the circulating water tank 4, one end of the circulating water tank 4 is connected to a circulating pump 16, one end of the circulating pump 16 is provided with a return pipe 17, the other end of the return pipe 17 is connected to the water supply tank 3, and one end of the circulating pump 16 is connected to the bottom of the observation tube body 1 through a connecting pipe 29.

[0025] Furthermore, the horizontal heights of the connection points between the first water inlet pipe 11 , the first water outlet pipe 14 and the observation tube body 1 are all flush with the surface of the granular fine matter layer 6 .

[0026] A detachable base 18 is provided at the bottom of the observation tube body 1, and the detachable base 18 is used to collect penetrable particles.

[0027] A first flow controller 19 and a first valve 20 are connected to the middle of the first water inlet pipe 11. The first flow controller 19 is used to control the size of the inflowing water flow, and a horizontal runoff experiment can be performed.

[0028] A second flow controller 21 and a second valve 22 are connected to the middle of the second water inlet pipe 12. The second flow controller 21 is used to control the size of the inflowing water flow, and a vertical seepage experiment can be performed.

[0029] A third valve 23 is provided at the first water outlet pipe 14, a filter 24 is provided in the middle of the first water outlet pipe 14, and the connection between the first water outlet pipe 14 and the observation tube body 1 is an overflow port. Excess water will be discharged into the circulating water tank 4 along the first water outlet pipe 14, and the filter 24 will filter out fine particles therein.

[0030] A third metal mesh 25 is provided at the connection between the second water outlet pipe 15 and the observation tube body 1 , a fourth valve 26 is provided in the middle of the second water outlet pipe 15 , and the third metal mesh 25 filters out fine particles therein.

[0031] The transparent porous medium layer 27 is made of sodium polyacrylate beads, and the meshes of the first metal mesh 5 and the second metal mesh 7 are smaller than the diameter of the sodium polyacrylate beads.

[0032] Specifically, the experimental section is filled with sodium polyacrylate beads. This highly absorbent polymer has an absorption capacity of 200-300 times its mass in water; therefore, its refractive index is very close to that of water. A PIV visualization measurement system is installed on the tube body to observe and record the movement of fine particles in the tube body 1 in real time. The second metal mesh 7 can adjust the height of the transparent porous medium layer 27, and the detachable base 18 is used to collect penetrable particles. Before the experiment begins, a transparent porous medium layer 27 is installed between the first metal mesh 5 and the second metal mesh 7, and a transparent porous medium layer 27 is installed between the metal plate 28. A granular fine material layer 6 with a total mass of M is placed on the top surface. Subsequently, the circulating pump 16 takes in water at a low flow rate through the connecting pipe 29, and injects water from the inside of the water supply tank to the bottom side of the observation tube body 1. The water level gradually rises from the bottom of the observation tube body 1 to exclude the air inside the transparent porous medium layer 27 to ensure the saturated seepage or runoff of the test. After the test starts, the circulating pump 16 sets the corresponding flow rate, pumps water from the circulating water tank to the water supply tank, opens the first valve or the second valve to inject water into the top of the inner part of the observation tube body 1, and performs saturated seepage or runoff, and then starts the PIV visualization measurement system. The high-speed camera 9 is turned on to record the movement of particles in the porous medium under the irradiation of the strong light source 8, and the results are stored in the computer 10. After running for a certain period of time, the particles in the particle layer 6 are basically penetrated into the transparent porous medium layer 27. At this time, the test is terminated. After stopping the test, the base 18 is removed, and the particles in the base 18 are taken out and dried. The load is recorded as m. By calculating the ratio of m to M, the penetration rate of the particles and other information can be obtained. This ends a cycle and obtains a set of experimental data. By studying the fluidization characteristics and blockage laws of fine particles in porous media, the device can verify the correctness of related numerical simulation results and provide support for research in related fields.

[0033] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for studying particle migration and blockage in a porous medium under the action of a fluid, comprising an observation tube (1), a PIV visualization detection system (2), a water supply tank (3) and a circulating water tank (4), characterized in that: A first metal mesh (5) is fixedly arranged on the top side of the observation tube body (1); a metal plate (28) is arranged at the center of the top of the first metal mesh (5); a granular fine matter layer (6) is arranged on the top of the metal plate (28); a second metal mesh (7) is arranged on the bottom side of the first metal mesh (5); the second metal mesh (7) can adjust the horizontal height inside the observation tube body (1); a transparent porous medium layer (27) is arranged between the first metal mesh (5) and the second metal mesh (7); the PIV visualization detection system (2) comprises a light source (8), a high-speed camera (9), and a computer (10); the computer (10) is electrically connected to the high-speed camera (9); the light source (8) and the high-speed camera (9) are aligned with the observation tube body (1); a first water inlet pipe (11) is arranged on one side of the bottom of the water supply tank (3); the other end of the first water inlet pipe (11) is connected to the observation tube body (1), a second water inlet pipe (12) is arranged at the center of the bottom of the water supply tank (3), a shower head (13) is arranged at the top of the inner top of the observation tube body (1), and the other end of the second water inlet pipe (12) is connected to the shower head (13), a first water outlet pipe (14) is arranged on one side of the top of the observation tube body (1), and one end of the first water outlet pipe (14) is connected to the circulating water tank (4), a second water outlet pipe (15) is arranged on one side of the bottom of the observation tube body (1), and the other end of the second water outlet pipe (15) is connected to the circulating water tank (4), one end of the circulating water tank (4) is connected to a circulating pump (16), one end of the circulating pump (16) is arranged with a return pipe (17), and the other end of the return pipe (17) is connected to the water supply tank (3), and one end of the circulating pump (16) is connected to the bottom of the observation tube body (1) through a connecting pipe (29).

2. The device for studying particle migration and blockage in porous media under the action of fluid according to claim 1, characterized in that: The horizontal heights of the connection points between the first water inlet pipe (11), the first water outlet pipe (14) and the observation tube body (1) are all flush with the surface of the particle fine matter layer (6).

3. The device for studying particle migration and blockage in porous media under the action of fluid according to claim 1, characterized in that: A detachable base (18) is provided at the bottom of the observation tube body (1).

4. The device for studying particle migration and blockage in porous media under the action of fluid according to claim 1, characterized in that: A first flow controller (19) and a first valve (20) are connected to the middle of the first water inlet pipe (11).

5. The device for studying particle migration and blockage in porous media under the action of fluid according to claim 4, characterized in that: A second flow controller (21) and a second valve (22) are connected to the middle of the second water inlet pipe (12).

6. The device for studying particle migration and blockage in porous media under the action of fluid according to claim 1, characterized in that: A third valve (23) is provided at the first water outlet pipe (14), and a filter (24) is provided in the middle of the first water outlet pipe (14).

7. The device for studying particle migration and blockage in porous media under the action of fluid according to claim 1, characterized in that: A third metal mesh (25) is provided at the connection between the second water outlet pipe (15) and the observation tube body (1), and a fourth valve (26) is provided in the middle of the second water outlet pipe (15).

8. The device for studying particle migration and blockage in porous media under the action of fluid according to claim 1, characterized in that: The transparent porous medium layer (27) is made of a material device of sodium polyacrylate beads, and the meshes of the first metal mesh (5) and the second metal mesh (7) are smaller than the diameter of the sodium polyacrylate beads.

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