An experimental system and method for measuring the migration and deposition behavior of low-density particles

Abstract

This invention provides an experimental system and method for measuring the migration and deposition behavior of low-density particles, belonging to the technical field of particle migration and deposition measurement research. It solves the problems of low-density particles struggling to stably enter a pipeline along a predetermined path and the easy confusion between bubble signals and particle signals. It includes a main loop, a Venturi addition branch, a pumping branch, a first venting branch, a second venting branch, and a visualization system. The main loop includes a storage tank, a main loop regulating valve, a circulating pump, a first pressure stabilizing chamber, a main loop ball valve, an experimental section, a second pressure stabilizing chamber, and a flow meter. The Venturi addition branch includes a Venturi particle addition device, a first addition branch ball valve, and a second addition branch ball valve. The Venturi particle addition device includes a Venturi tube and a feeding cylinder, with the feeding cylinder connected to the throat of the Venturi tube. A particle injection port and a solution injection port are located above the feeding cylinder. This system enables the injection of low-density particles and the observation of their migration and deposition behavior in the experimental section.

Description

Technical Field

[0001] This invention belongs to the field of particle migration and deposition measurement technology, and in particular relates to an experimental system and method for measuring the migration and deposition behavior of low-density particles. Background Technology

[0002] Particle migration and deposition are widespread phenomena in gas-liquid two-phase flow, environmental particle transport, energy and power systems, and related industrial processes. Unlike conventional high-density particles, low-density particles, due to their lower density, exhibit unique force characteristics in fluids. During experiments, they are affected not only by fluid drag and viscous forces but also by gravity and buoyancy. When the density difference between low-density particles and the surrounding fluid is small, their motion behavior is more sensitive to the buoyancy effect, and their actual migration direction, suspension state, and ability to enter the flow channel all differ significantly from those of traditional particles.

[0003] Most existing particle injection experiments are designed for high-density particles, typically employing gravity feeding, conventional inlet delivery, or direct transport via a carrier fluid into the test pipeline. These methods are less suitable for low-density particles. Low-density particles are prone to floating, drifting, stagnation, or aggregation under buoyancy, making it difficult for them to stably enter the pipeline along a predetermined path. Furthermore, during pipeline flow, microbubbles are often generated within the fluid. These microbubbles and low-density particles exhibit similar force characteristics in the flow field, especially when buoyancy is significant. They may show similar motion directions and migration trends, making it easy for bubble signals and particle signals to be confused during experimental measurements, posing significant challenges to particle identification, trajectory tracking, concentration statistics, and deposition measurements.

[0004] In experiments on low-density particle migration and deposition, the key issues affecting the success or failure of the experiment are how to effectively inject low-density particles, enabling them to stably enter the target channel and form controllable initial conditions, and how to effectively separate and accurately identify particles and bubbles in the presence of microbubble interference. In particular, the rational setting of the particle injection location, the stable control of the injection process, and the method for separating and identifying bubbles and particles directly determine the feasibility, measurement accuracy, and repeatability of the experimental setup. Existing technologies still have significant shortcomings in these aspects. Therefore, there is an urgent need for an experimental system and method for measuring the migration and deposition behavior of low-density particles, capable of injecting low-density particles and observing their migration and deposition behavior within the experimental section. Summary of the Invention

[0005] In view of this, in order to solve the problem that low-density particles are difficult to enter the pipeline stably along the predetermined path when using existing feeding methods, and that bubble signals and particle signals are easily confused, this invention proposes an experimental system and method for measuring the migration and deposition behavior of low-density particles, which can realize the injection of low-density particles and the observation of particle migration and deposition behavior in the experimental section.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An experimental system for measuring the migration and deposition behavior of low-density particles, comprising: The main circuit includes a storage tank, a main circuit regulating valve, a circulating pump, a first pressure stabilizing chamber, a main circuit ball valve, an experimental section, a second pressure stabilizing chamber, and a flow meter. The outlet of the storage tank is connected to the input of the circulating pump through the main circuit regulating valve. The output of the circulating pump is connected to the inlet of the first pressure stabilizing chamber. The outlet of the first pressure stabilizing chamber is connected to the inlet of the experimental section through the main circuit ball valve. The outlet of the experimental section is connected to the inlet of the second pressure stabilizing chamber. The outlet of the second pressure stabilizing chamber is connected to the inlet of the storage tank. The flow meter is installed between the second pressure stabilizing chamber and the storage tank. A first exhaust pipe is provided above the first pressure stabilizing chamber, and a first pressure stabilizing chamber shut-off valve is provided on the first exhaust pipe. A second exhaust pipe is provided above the second pressure stabilizing chamber, and a second pressure stabilizing chamber shut-off valve is provided on the second exhaust pipe. The Venturi addition branch includes a Venturi particle addition device, a first addition branch ball valve, and a second addition branch ball valve. The Venturi particle addition device includes a Venturi tube and a feeding cylinder. The feeding cylinder is connected to the throat of the Venturi tube. A particle injection port and a solution injection port are provided above the feeding cylinder. The inlet of the Venturi particle addition device is connected to the outlet of the first pressure stabilizing chamber through the first addition branch ball valve. The outlet of the Venturi particle addition device is connected to the inlet of the experimental section through the second addition branch ball valve. The pumping branch is connected to the solution injection port at one end and to the storage tank at the other end. The pumping branch is equipped with a pumping pump and a pumping branch regulating valve. The first exhaust branch has one end connected to the outlet of the experimental section and the other end connected to the liquid storage tank. The first exhaust branch is equipped with a first exhaust branch shut-off valve. The second exhaust branch has one end connected to the inlet of the experimental section and the other end connected to the liquid storage tank. The second exhaust branch is equipped with a second exhaust branch shut-off valve. The visualization system includes a first high-speed camera, a second high-speed camera, a third high-speed camera, and a computer. The first high-speed camera, the second high-speed camera, and the third high-speed camera are all electrically connected to the computer. The first high-speed camera is located in front of the experimental section, the second high-speed camera is located above the experimental section, and the third high-speed camera is located below the experimental section.

[0007] As a preferred embodiment of the experimental system for measuring the migration and deposition behavior of low-density particles, the experimental section, the first pressure stabilizing chamber, the second pressure stabilizing chamber, the Venturi particle addition device, and the storage tank are all made of transparent material.

[0008] As a preferred embodiment of the experimental system for measuring the migration and deposition behavior of low-density particles, the liquid storage tank is provided with an injection port on top.

[0009] As a preferred embodiment of the experimental system for measuring the migration and deposition behavior of low-density particles, a drain pipe is provided below the storage tank, and a drain shut-off valve is provided on the drain pipe.

[0010] As a preferred embodiment of the experimental system for measuring the migration and deposition behavior of low-density particles, the inlet of the liquid storage tank is positioned higher than the outlet of the liquid storage tank, and both the inlet and outlet of the liquid storage tank are located below the liquid surface.

[0011] As a preferred embodiment of the experimental system for measuring the migration and deposition behavior of low-density particles, the end of the first exhaust branch connected to the storage tank is located above the liquid surface of the storage tank; the end of the second exhaust branch connected to the storage tank is located above the liquid surface of the storage tank.

[0012] This invention also provides an experimental method for measuring the migration and deposition behavior of low-density particles, using the aforementioned experimental system for measuring the migration and deposition behavior of low-density particles, comprising: S1: Loop Injection: Open the main loop regulating valve, main loop ball valve, first pressure stabilizing chamber shut-off valve, and second pressure stabilizing chamber shut-off valve. Start the circulation pump. The solution in the storage tank enters the first pressure stabilizing chamber, the experimental section, and the second pressure stabilizing chamber until the first and second pressure stabilizing chambers are full of solution. Close the first and second pressure stabilizing chamber shut-off valves. Open the first and second exhaust branch shut-off valves to expel air bubbles from the experimental section. Then, close the first and second exhaust branch shut-off valves. Control the main loop flow rate by adjusting the main loop regulating valve until the flow meter monitors a stable main loop flow rate. S2: Particle Injection: Maintain the operation of the circulating pump, close the main circuit ball valve, open the first exhaust branch shut-off valve, the second exhaust branch shut-off valve, the first addition branch ball valve, the second addition branch ball valve, and the water pump regulating valve, start the water pump, and the solution flows through the Venturi particle addition device into the experimental section. Adjust the main circuit regulating valve to the target flow rate of the experiment; partially open the main circuit ball valve, and adjust the first addition branch ball valve and the second addition branch ball valve to change the flow rate of the Venturi tube, so that the liquid level in the feeding cylinder remains highly stable. Close the first exhaust branch shut-off valve and the second exhaust branch shut-off valve, and add a certain amount of particles into the feeding cylinder through the particle injection port, thereby injecting particles into the experimental section; S3: Debug the camera. After debugging is complete, repeat S2 and start the formal experiment and record the data.

[0013] As a preferred embodiment of the above-mentioned experimental method for measuring the migration and deposition behavior of low-density particles, S4 is also included; S4: After the experiment, turn off the circulation pump, water pump, first high-speed camera, second high-speed camera, third high-speed camera and computer. Open the drain stop valve set below the storage tank, as well as the first pressure stabilizing chamber stop valve and the second pressure stabilizing chamber stop valve to drain all the solution in the system.

[0014] As a preferred embodiment of the above-mentioned experimental method for measuring the migration and deposition behavior of low-density particles, before S1, the method further includes: disassembling the experimental section from the main circuit, cleaning the inside of the experimental section with a high-pressure water gun, and then reassembling it into the main circuit after cleaning.

[0015] As a preferred embodiment of the experimental method for measuring the migration and deposition behavior of low-density particles, the first high-speed camera is used to capture the particle motion behavior in the XY plane, recording the position and state of the particles in each time period in the XY plane; the third high-speed camera is used to capture the particle motion behavior in the YZ plane, recording the position and state of the particles in each time period in the YZ plane. The particle motion images recorded by the first and third high-speed cameras at each moment are processed by computer to obtain the particle motion path and distance in each time period, as well as the particle migration speed; the second high-definition camera is used to capture the deposition distribution state of particles on the surface of the experimental section at each moment, and the two-dimensional distribution characteristics of particle deposition on the wall surface are obtained over time through computer post-processing.

[0016] Compared with existing technologies, the beneficial effects of the experimental system and method for measuring the migration and deposition behavior of low-density particles provided by this invention are: (1) The experimental system for measuring the migration and deposition behavior of low-density particles can effectively inject low-density particles. In view of the problem that low-density particles are difficult to enter the pipeline in the conventional way due to buoyancy, the experimental system optimizes the particle injection method. By using the low-pressure property of the venturi throat to draw the particles into the pipeline, it can effectively overcome the problem of particles easily floating and being stuck in the traditional gravity or conventional injection method, and improve the success rate and stability of low-density particles entering the target pipeline.

[0017] (2) The experimental system for measuring the migration and deposition behavior of low-density particles can effectively separate bubbles from low-density particles. In view of the problem that tiny bubbles are easily generated during pipeline flow and that bubbles and low-density particles are difficult to distinguish due to their similar force directions and motion characteristics, the experimental system effectively eliminates bubbles in the experimental section by setting up a first pressure stabilizing chamber, a second pressure stabilizing chamber, a first exhaust branch, and a second exhaust branch, thereby reducing the interference of bubbles on particle measurement.

[0018] (3) The experimental system for measuring the migration and deposition behavior of low-density particles can monitor the migration and deposition of particles in the experimental section in real time. The system is captured by a first high-speed camera, a second high-speed camera, and a third high-speed camera. The second high-speed camera can record the changing trend of particle deposition distribution over time, while the first and third high-speed cameras can be used to capture the three-dimensional flow characteristics of particles in the experimental section. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the experimental system for measuring the migration and deposition behavior of low-density particles provided in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the Venturi particle addition device of the experimental system for measuring the migration and deposition behavior of low-density particles provided in a specific embodiment of the present invention.

[0020] In the picture: 1. Storage tank; 2. Main circuit regulating valve; 3. Circulating pump; 4. First pressure stabilizing chamber; 5. Main circuit ball valve; 6. Experimental section; 7. Second pressure stabilizing chamber; 8. Flow meter; 9. Venturi particle adding device; 10. Water pump; 11. Second adding branch ball valve; 12. First adding branch ball valve; 13. Second exhaust branch shut-off valve; 14. First exhaust branch shut-off valve; 15. First pressure stabilizing chamber shut-off valve; 16. Second pressure stabilizing chamber shut-off valve; 17. First high-speed camera; 18. Third high-speed camera; 19. Second high-speed camera; 20. Computer; 91. Venturi tube; 92. Feeding cylinder. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0022] See Figure 1-2This invention provides an experimental system and method for measuring the migration and deposition behavior of low-density particles. The experimental system includes a main loop, a Venturi feed branch, a pumping branch, a first venting branch, a second venting branch, and a visualization system. The main loop includes a storage tank 1, a main loop regulating valve 2, a circulating pump 3, a first pressure stabilizing chamber 4, a main loop ball valve 5, an experimental section 6, a second pressure stabilizing chamber 7, and a flow meter 8. The outlet of the storage tank 1 is connected to the input of the circulating pump 3 via the main loop regulating valve 2. The output of the circulating pump 3 is connected to the inlet of the first pressure stabilizing chamber 4. The outlet of the first pressure stabilizing chamber 4 is connected to the inlet of the experimental section 6 via the main loop ball valve 5. The outlet of the experimental section 6 is connected to the inlet of the second pressure stabilizing chamber 7. The outlet of the second pressure stabilizing chamber 7 is connected to the inlet of the storage tank 1. The flow meter 8 is located in the second pressure stabilizing chamber 7. Between the storage tanks 1; a first exhaust pipe is provided above the first pressure stabilizing chamber 4, and a first pressure stabilizing chamber shut-off valve 15 is provided on the first exhaust pipe; a second exhaust pipe is provided above the second pressure stabilizing chamber 7, and a second pressure stabilizing chamber shut-off valve 16 is provided on the second exhaust pipe; the Venturi addition branch includes a Venturi particle addition device 9, a first addition branch ball valve 12, and a second addition branch ball valve 11. The Venturi particle addition device 9 includes a Venturi tube 91 and a feeding cylinder 92. The feeding cylinder 92 is connected to the throat of the Venturi tube 91. A particle injection port and a solution injection port are provided above the feeding cylinder 92. The inlet of the Venturi particle adding device 9 is connected to the outlet of the first pressure stabilizing chamber 4 via the first adding branch ball valve 12, and the outlet of the Venturi particle adding device 9 is connected to the inlet of the experimental section 6 via the second adding branch ball valve 11; one end of the pumping branch is connected to the solution injection port, and the other end is connected to the storage tank 1, and the pumping branch is equipped with a pumping pump 10 and a pumping branch regulating valve; one end of the first exhaust branch is connected to the outlet of the experimental section 6, and the other end is connected to the storage tank 1, and the first exhaust branch is equipped with a first exhaust branch shut-off valve 14; one end of the second exhaust branch... The system is connected to the inlet end of experimental section 6 and the other end is connected to the liquid storage tank 1. A second exhaust branch shut-off valve 13 is provided on the second exhaust branch. The visualization system includes a first high-speed camera 17, a second high-speed camera 19, a third high-speed camera 18 and a computer 20. The first high-speed camera 17, the second high-speed camera 19 and the third high-speed camera 18 are all electrically connected to the computer 20. The first high-speed camera 17 is located in front of experimental section 6, the second high-speed camera 19 is located above experimental section 6 and the third high-speed camera 18 is located below experimental section 6.

[0023] In this experimental system for measuring the migration and deposition behavior of low-density particles, the main loop regulating valve 2 is used to control the main loop flow rate, thereby regulating the liquid phase flow rate in the experimental section 6; the first pressure stabilizing chamber 4 and the second pressure stabilizing chamber 7 can not only stabilize the main loop pressure, but also the first pressure stabilizing chamber 4 can eliminate the bubbles generated in the main loop, and the second pressure stabilizing chamber 7 can clean the residual particles in the liquid phase, ensuring that the particles flowing through the experimental section 6 in the next experiment are all of the preset particle type under the current working conditions. Particles are injected into the feeding cylinder 92 through the particle injection port above the feeding cylinder 92. The water pump 10 draws solution from the storage tank 1 and slowly injects it into the feeding cylinder 92 above the Venturi particle adding device 9, thus dispersing the particles. Due to the low-pressure characteristics of the throat of the Venturi tube 91, the mixed particle dispersion phase is adsorbed and injected into the experimental section 6. The distance between the Venturi particle adding device 9 and the experimental section 6 is a predetermined distance, short enough to prevent particle stratification or deposition on the pipe wall between the Venturi particle adding device 9 and the experimental section 6. The first and second exhaust branches are used to exhaust air from the experimental section 6 before the formal experiment begins, ensuring no air bubbles remain in the experimental section 6. The camera observation range is adjusted according to the experimental conditions. The first high-speed camera 17 is mainly responsible for capturing the particle motion behavior in the XY plane, recording the position and state of the particle in each time period in the XY plane. The third high-speed camera 18 is responsible for capturing the particle motion behavior in the YZ plane, recording the position and state of the particle in each time period in the YZ plane. The particle motion images recorded by the first high-speed camera 17 and the third high-speed camera 18 at each moment are processed by the computer 20 to obtain the particle motion path and distance in each time period, as well as the particle migration speed. The second high-speed camera 19 is responsible for capturing the deposition distribution state of the particles on the surface of experimental section 6 at each moment. The two-dimensional distribution characteristics of the particles deposited on the wall surface can be obtained over time through post-processing by the computer 20.

[0024] Figure 2 The arrows in the diagram indicate the direction of solution flow.

[0025] This experimental system for measuring the migration and deposition behavior of low-density particles is simple in structure and easy to operate. It can achieve stable injection of low-density particles through the negative pressure principle of the Venturi throat. It can effectively separate bubbles from low-density particles through the first pressure stabilizing chamber 4, the second pressure stabilizing chamber 7, the first exhaust branch and the second exhaust branch. At the same time, combined with three high-speed cameras, it can accurately capture the migration and deposition behavior of particles in the experimental section 6.

[0026] Optionally, the experimental section 6, the first pressure stabilizing chamber 4, the second pressure stabilizing chamber 7, the Venturi particle adding device 9, and the storage tank 1 are all made of transparent material. In this embodiment, the experimental section 6, the first pressure stabilizing chamber 4, the second pressure stabilizing chamber 7, the Venturi particle adding device 9, and the storage tank 1 are all made of acrylic sheet or glass-like transparent material to ensure the visibility of the entire experimental section.

[0027] Optionally, the storage tank 1 is provided with a filling port at the top. The storage tank 1 is a non-sealed space. The opening at the top of the storage tank 1 is mainly for the purpose of facilitating the addition of solution to the storage tank 1.

[0028] Optionally, a drain pipe is provided below the storage tank 1, and a drain stop valve is provided on the drain pipe. This is used to drain the solution after the experiment.

[0029] Optionally, the inlet of the storage tank 1 is positioned higher than the outlet of the storage tank 1, and both the inlet and outlet of the storage tank 1 are located below the liquid surface. This prevents the solution flowing back into the storage tank 1 from generating a large number of bubbles in the storage tank 1.

[0030] Optionally, the end of the first exhaust branch connected to the liquid storage tank 1 is located above the liquid surface of the liquid storage tank 1; the end of the second exhaust branch connected to the liquid storage tank 1 is located above the liquid surface of the liquid storage tank 1.

[0031] Optionally, one end of the pumping branch connected to the storage tank 1 is located below the liquid level in the storage tank 1.

[0032] This invention also provides an experimental method for measuring the migration and deposition behavior of low-density particles, using the aforementioned experimental system for measuring the migration and deposition behavior of low-density particles, comprising: Before the experiment begins, check the status of all valves to ensure that all valves are closed except for the main circuit regulating valve 2 and the main circuit ball valve 5, which are open. Before injecting liquid into the main circuit, disassemble the experimental section 6 from the main circuit and clean its interior with a high-pressure water gun. After cleaning, reassemble it into the main circuit to avoid impurities affecting the experiment.

[0033] After assembling the experimental circuit, the circuit needs to be tested before injecting the particles.

[0034] S1: Loop Injection: Open the main loop regulating valve 2, main loop ball valve 5, first pressure stabilizing chamber shut-off valve 15, and second pressure stabilizing chamber shut-off valve 16. Start the circulation pump 3. The circulation pump 3 draws the solution from the storage tank 1 into the main loop, into the first pressure stabilizing chamber 4, experimental section 6, and second pressure stabilizing chamber 7, until the first pressure stabilizing chamber 4 and second pressure stabilizing chamber 7 are filled with solution. Close the first pressure stabilizing chamber shut-off valve 15 and the second pressure stabilizing chamber shut-off valve 16. Open the first exhaust branch shut-off valve 14 and the second exhaust branch shut-off valve 13 to expel the air bubbles inside the experimental section 6. After there are no obvious air bubbles in the experimental section 6, close the first exhaust branch shut-off valve 14 and the second exhaust branch shut-off valve 13. Control the main loop flow rate by adjusting the main loop regulating valve 2 until the flow meter 8 monitors the main loop flow rate as stable.

[0035] S2: Particle Injection: Maintain the operation of the circulating pump 3, close the main circuit ball valve 5, open the first exhaust branch shut-off valve 14, the second exhaust branch shut-off valve 13, the first addition branch ball valve 12, the second addition branch ball valve 11, and the water pumping branch regulating valve, start the water pump 10, and the solution flows through the Venturi particle addition device 9 and enters the experimental section 6. Adjust the main circuit regulating valve 2 to the target flow rate of the experiment; partially open the main circuit ball valve 5, and adjust the first addition branch ball valve 12 and the second addition branch ball valve 11 to change the flow rate of the Venturi tube 91, so that the liquid level in the feeding cylinder 92 remains highly stable. Close the first exhaust branch shut-off valve 14 and the second exhaust branch shut-off valve 13, and add a certain amount of particles into the feeding cylinder 92 through the particle injection port, thereby injecting particles into the experimental section 6; after the particles can be injected into the experimental section normally and stably, perform visualization system debugging. S3: Debug the visualization system. After the debugging is completed, repeat S2, and start the formal experiment and record the data.

[0036] The visualization system debugging process is as follows: Turn on the first high-speed camera 17, the second high-speed camera 19, and the third high-speed camera 18, as well as the computer 20, and turn on the supplementary light. Slowly inject particles into the experimental section 6 through the particle injection port of the feeding cylinder 92. Use the computer 20 to check whether the viewing angles of the three high-speed cameras are aligned and whether the lenses are in focus. Adjust the correct shutter speed and exposure until the moving particles can be clearly observed.

[0037] Once the above debugging is completed, S2 can be repeated to begin the formal experiment and record the data.

[0038] S4: After the experiment, turn off the circulation pump 3, water pump 10, first high-speed camera 17, second high-speed camera 19, third high-speed camera 18, and computer 20. Open the drain shut-off valve located below the storage tank 1, as well as the first pressure stabilizing chamber shut-off valve 15 and the second pressure stabilizing chamber shut-off valve 16, to drain all the solution from the system. Clean the particles suspended on the surface of the solution for future use.

[0039] The first high-speed camera 17 is used to capture the particle's XY plane motion behavior, recording the particle's position and state in each time period of the XY plane; the third high-speed camera 18 is used to capture the particle's YZ plane motion behavior, recording the particle's position and state in each time period of the YZ plane. The particle motion images recorded by the first high-speed camera 17 and the third high-speed camera 18 at each moment are processed by the computer 20 to obtain the particle's motion path and distance in each time period, as well as the particle's migration speed; the second high-definition camera is used to capture the particle's deposition distribution state on the surface of the experimental section 6 at each moment, and the computer 20 is used to process the two-dimensional distribution characteristics of the particle deposition on the wall surface over time to obtain the trend of particle deposition characteristics over time.

[0040] Obviously, the above-disclosed embodiments of the present invention are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. It is neither necessary nor possible to exhaustively describe all embodiments herein.

Claims

1. An experimental system for measuring the migration and deposition behavior of low-density particles, characterized in that, include: The main circuit includes a storage tank (1), a main circuit regulating valve (2), a circulating pump (3), a first pressure stabilizing chamber (4), a main circuit ball valve (5), an experimental section (6), a second pressure stabilizing chamber (7), and a flow meter (8). The outlet of the storage tank (1) is connected to the input of the circulating pump (3) through the main circuit regulating valve (2), and the output of the circulating pump (3) is connected to the inlet of the first pressure stabilizing chamber (4). The outlet of the first pressure stabilizing chamber (4) is connected to the inlet of the experimental section (6) through the main circuit ball valve (5). The outlet of the experimental section (6) is connected to the inlet of the second pressure stabilizing chamber (7), and the outlet of the second pressure stabilizing chamber (7) is connected to the inlet of the storage tank (1). The flow meter (8) is set between the second pressure stabilizing chamber (7) and the storage tank (1). A first exhaust pipe is provided above the first pressure stabilizing chamber (4), and a first pressure stabilizing chamber shut-off valve (15) is provided on the first exhaust pipe. A second exhaust pipe is provided above the second pressure stabilizing chamber (7), and a second pressure stabilizing chamber shut-off valve (16) is provided on the second exhaust pipe. The Venturi addition branch includes a Venturi particle addition device (9), a first addition branch ball valve (12), and a second addition branch ball valve (11). The Venturi particle addition device (9) includes a Venturi tube (91) and a feeding cylinder (92). The feeding cylinder (92) is connected to the throat of the Venturi tube (91). A particle injection port and a solution injection port are provided above the feeding cylinder (92). The inlet of the Venturi particle addition device (9) is connected to the outlet of the first pressure stabilizing chamber (4) through the first addition branch ball valve (12). The outlet of the Venturi particle addition device (9) is connected to the inlet of the experimental section (6) through the second addition branch ball valve (11). The pumping branch is connected to the solution injection port at one end and to the storage tank (1) at the other end. The pumping branch is equipped with a pumping pump (10) and a pumping branch regulating valve. The first exhaust branch is connected at one end to the outlet of the experimental section (6) and at the other end to the storage tank (1). The first exhaust branch is equipped with a first exhaust branch stop valve (14). The second exhaust branch is connected at one end to the inlet of the experimental section (6) and at the other end to the storage tank (1). The second exhaust branch is equipped with a second exhaust branch shut-off valve (13). The visualization system includes a first high-speed camera (17), a second high-speed camera (19), a third high-speed camera (18), and a computer (20). The first high-speed camera (17), the second high-speed camera (19), and the third high-speed camera (18) are all electrically connected to the computer (20). The first high-speed camera (17) is located in front of the experimental section (6), the second high-speed camera (19) is located above the experimental section (6), and the third high-speed camera (18) is located below the experimental section (6).

2. The experimental system for measuring the migration and deposition behavior of low-density particles according to claim 1, characterized in that: The experimental section (6), the first pressure stabilizing chamber (4), the second pressure stabilizing chamber (7), the Venturi particle adding device (9), and the storage tank (1) are all made of transparent material.

3. The experimental system for measuring the migration and deposition behavior of low-density particles according to claim 1, characterized in that: The storage tank (1) is provided with an injection port on its top.

4. The experimental system for measuring the migration and deposition behavior of low-density particles according to claim 1, characterized in that: The storage tank (1) is provided with a drain pipe at the bottom, and a drain stop valve is provided on the drain pipe.

5. The experimental system for measuring the migration and deposition behavior of low-density particles according to claim 1, characterized in that: The inlet of the liquid storage tank (1) is higher than the outlet of the liquid storage tank (1), and both the inlet and outlet of the liquid storage tank (1) are below the liquid surface.

6. The experimental system for measuring the migration and deposition behavior of low-density particles according to claim 1, characterized in that: The first exhaust branch is connected to the liquid storage tank (1) at one end, which is above the liquid surface of the liquid storage tank (1); the second exhaust branch is connected to the liquid storage tank (1) at one end, which is above the liquid surface of the liquid storage tank (1).

7. An experimental method for measuring the migration and deposition behavior of low-density particles, characterized in that: The experimental system for measuring the migration and deposition behavior of low-density particles according to any one of claims 1-6 includes: S1: Loop Injection: Open the main loop regulating valve (2), main loop ball valve (5), first pressure stabilizing chamber shut-off valve (15) and second pressure stabilizing chamber shut-off valve (16), start the circulation pump (3), and the solution in the storage tank (1) enters the first pressure stabilizing chamber (4), experimental section (6) and second pressure stabilizing chamber (7) until the first pressure stabilizing chamber (4) and second pressure stabilizing chamber (7) are filled with solution, and close the first pressure stabilizing chamber shut-off valve (15) and second pressure stabilizing chamber shut-off valve (16); open the first exhaust branch shut-off valve (14) and second exhaust branch shut-off valve (13) to discharge the air bubbles inside the experimental section (6), and then close the first exhaust branch shut-off valve (14) and second exhaust branch shut-off valve (13); control the main loop flow rate by adjusting the main loop regulating valve (2) until the flow meter (8) monitors the main loop flow rate to be stable; S2: Particle injection: Maintain the operation of the circulating pump (3), close the main circuit ball valve (5), open the first exhaust branch stop valve (14), the second exhaust branch stop valve (13), the first addition branch ball valve (12), the second addition branch ball valve (11), and the water pumping branch regulating valve, start the water pump (10), and the solution flows through the Venturi particle addition device (9) and enters the experimental section (6). Adjust the main circuit regulating valve (2) to the target flow rate of the experiment; partially open the main circuit ball valve (5), and adjust the first addition branch ball valve (12) and the second addition branch ball valve (11) to change the flow rate of the Venturi tube (91) so that the liquid level of the feeding cylinder (92) remains highly stable. Close the first exhaust branch stop valve (14) and the second exhaust branch stop valve (13), and add a certain amount of particles into the feeding cylinder (92) through the particle injection port, thereby injecting particles into the experimental section (6); S3: Debug the visualization system. After debugging is complete, repeat S2 and start the formal experiment and record the data.

8. The experimental method for measuring the migration and deposition behavior of low-density particles according to claim 7, characterized in that: It also includes S4; S4: After the experiment, turn off the circulation pump (3), water pump (10), first high-speed camera (17), second high-speed camera (19), third high-speed camera (18) and computer (20), and open the drain stop valve set below the storage tank (1), as well as the first pressure stabilizing chamber stop valve (15) and the second pressure stabilizing chamber stop valve (16) to drain all the solution in the system.

9. The experimental method for measuring the migration and deposition behavior of low-density particles according to claim 7, characterized in that: Before S1, the process also includes: disassembling the experimental section (6) from the main circuit and cleaning the inside of the experimental section (6) with a high-pressure water gun, and then reassembling it into the main circuit after cleaning.

10. The experimental method for measuring the migration and deposition behavior of low-density particles according to claim 7, characterized in that: The first high-speed camera (17) is used to capture the particle's XY plane motion behavior and record the particle's position and state in each time period of the XY plane; the third high-speed camera (18) is used to capture the particle's YZ plane motion behavior and record the particle's position and state in each time period of the YZ plane. The particle motion images recorded by the first high-speed camera (17) and the third high-speed camera (18) at each moment are processed by the computer (20) to obtain the particle's motion path and distance in each time period, as well as the particle's migration speed; the second high-definition camera is used to capture the particle's deposition distribution state on the surface of the experimental section (6) at each moment. The two-dimensional distribution characteristics of the particle's deposition on the wall surface are obtained by the computer (20) through post-processing.

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