Small pipeline type resuspension micromechanism experimental device

Abstract

The invention relates to a small pipeline type resuspension micromechanism experiment device which comprises an air supply device, a test pipeline, a rectification assembly, a tray and an image acquisition device. The air supply equipment air outlet is communicated with the inlet of the test pipeline; the rectification assembly and the tray are sequentially arranged in the test pipeline along the direction from the inlet to the outlet of the test pipeline; the rectifying assembly is used for rectifying airflow output by the air supply equipment to form uniform and stable turbulent flow and comprises a rectifying grating and a turbulent flow attenuation net. The rectification grating and the turbulence attenuation net are sequentially arranged along the direction from the inlet to the outlet of the test pipeline; the tray and the test pipeline are horizontally arranged, and the top surface of the tray is provided with an accommodating part; the accommodating part is used for accommodating soil particles; and the image acquisition equipment is used for acquiring an image when the soil particles move. The micro mechanism of particles in the wind erosion process can be analyzed more deeply, and the blank that a traditional wind tunnel device and a large experimental device cannot accurately capture particle motion details is filled.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, and in particular to a small-scale pipeline-type resuspension microscopic mechanism experimental device. Background Technology

[0002] Resuspension of contaminated sites is one of the most significant sources of soil-air pollution. Exposed ground, especially loose soils such as sandy soils in northern my country, generates large amounts of dust and soil resuspension under conditions of high-frequency, strong winds. This can lead to the migration and spread of soil pollutants or cause health hazards from inhalation, posing a critical issue for environmental safety and the health of workers.

[0003] In existing technologies, most experimental setups for soil particle resuspension focus on the effects of wind on particle resuspension, typically employing wind tunnels, large experimental chambers, or airflow ducts to simulate the effects of different wind speeds on particulate matter. These setups generally have the following characteristics: Wind tunnels or airflow duct platforms: These utilize enclosed airflow ducts or wind tunnel systems to generate a controllable airflow environment, simulating wind erosion. Some studies use large wind tunnels or airflow systems to analyze the relationship between wind erosion and particle migration by simulating the resuspension of soil particles at different wind speeds.

[0004] Airflow rate control and measurement system: The airflow rate in the pipeline is precisely adjusted by devices such as fans and regulating valves, and airflow parameters are monitored in real time using devices such as wind speed sensors.

[0005] Particulate matter motion monitoring: capturing the number of resuspended particles using a particle counter or dosimeter.

[0006] Single or limited experimental parameter control: Experiments are usually conducted by adjusting parameters such as wind speed and particle size, mainly to study the effect of a single factor on particle resuspension.

[0007] Although existing technologies have made some progress in the study of soil resuspension processes, certain shortcomings still exist: Most existing devices lack turbulence homogenization treatment, resulting in poor stability and reproducibility of wind erosion processes in experiments. Traditional large-scale wind tunnel experimental devices are bulky, have poor adjustment flexibility, and are difficult to conduct multi-factor coupled experiments. Large-scale wind tunnel experiments, limited by their structure and size, cannot achieve rapid and uniform wind speed increases while stabilizing turbulence within the device. They also lack sufficient microscale observation capabilities to precisely capture the critical microscopic motion states and mechanisms of small particles of different sizes, making them unsuitable for comprehensive experiments involving multiple parameters such as wind speed, particle size, and pollutant doping. Existing experimental data typically focus on macroscopic statistical results, lacking precise recording and analysis of microscopic processes such as particle trajectory, desorption-lifting-migration, and thus failing to provide reliable data support for establishing soil particle resuspension dynamics models. These problems urgently need to be addressed. Summary of the Invention

[0008] This invention discloses a small-scale pipeline-type resuspension microscopic mechanism experimental device, which aims to solve the technical problems existing in the prior art.

[0009] The present invention adopts the following technical solution: This invention provides a small-scale pipeline-type resuspension microscopic mechanism experimental device, comprising an air supply device, a test pipeline, a rectification component, a tray, and an image acquisition device; the air outlet of the air supply device is connected to the inlet of the test pipeline; the rectification component and the tray are sequentially arranged inside the test pipeline along the inlet to outlet direction; the rectification component is used to rectify the airflow output by the air supply device to form uniform and stable turbulence, and includes a rectification grid and a turbulence attenuation net; the rectification grid and the turbulence attenuation net are sequentially arranged along the inlet to outlet direction of the test pipeline; both the tray and the test pipeline are horizontally arranged, and the top surface of the tray has a receiving portion; the receiving portion is used to receive soil particles; the image acquisition device is used to acquire images when the soil particles are moving.

[0010] The small-scale pipeline resuspension microscopic mechanism experimental device of the present invention includes multiple layers of the turbulence attenuation net; the multiple layers of turbulence attenuation net are spaced apart, and the first turbulence attenuation net is attached to the rectifier grid.

[0011] In the small-scale pipeline resuspension microscopic mechanism experimental device of the present invention, the turbulence attenuation net is a wire mesh with a mesh opening diameter of 0.1 mm and a thickness of 0.2 mm.

[0012] In the small-scale pipeline resuspension microscopic mechanism experimental device of the present invention, the turbulence attenuation network includes a first turbulence attenuation network and a second turbulence attenuation network; the distance between the first turbulence attenuation network and the second turbulence attenuation network is 2 cm.

[0013] In the small-scale pipe-type resuspension microscopic mechanism experimental device of the present invention, the rectifying grid is a honeycomb mesh and includes a first rectifying grid, a second rectifying grid, and a third rectifying grid. The first rectifying grid, the second rectifying grid, and the third rectifying grid are sequentially attached along the inlet to outlet direction of the test pipe, and the inscribed circle diameters of the first rectifying grid, the second rectifying grid, and the third rectifying grid are 8.2 mm, 6.4 mm, and 3.2 mm, respectively, and their thicknesses are 0.8 mm, 0.6 mm, and 0.5 mm, respectively. In the small-scale pipe-type resuspension microscopic mechanism experimental device of the present invention, the distance between the tray and the rectifying assembly is greater than or equal to four times the length of the test pipe.

[0014] The small-scale tubular resuspension microscopic mechanism experimental device of the present invention includes a plurality of said receiving parts; the percentage of said receiving parts to the top surface area of ​​said tray is less than or equal to 30%.

[0015] In the small-scale pipeline resuspension microscopic mechanism experimental device of the present invention, the receiving part is a sinkhole with a diameter of 1 mm.

[0016] The small-scale pipeline resuspension microscopic mechanism experimental device of the present invention also includes a first flow velocity measuring element; the first flow velocity measuring element is used to measure the flow velocity on the outlet side of the rectifier assembly; the air supply device is a variable frequency fan.

[0017] In the small-scale pipeline-type resuspension microscopic mechanism experimental device of the present invention, the experimental pipeline is made of transparent material at the position corresponding to the tray, so that the image acquisition device can acquire images of the soil particles from outside the experimental pipeline.

[0018] The technical solution adopted in this invention can achieve the following beneficial effects: This invention primarily provides a small-scale, pipe-type experimental device for the microscopic mechanism of soil particle resuspension. Based on rectifying the airflow output from the air supply equipment using a rectifying component to form a uniform and stable turbulent flow, it provides a standardized hydrodynamic environment for soil particle resuspension experiments. This solves the problems of large data fluctuations and poor reproducibility caused by uneven turbulence in existing mainstream devices, thereby improving the reliability and accuracy of the experiment. Combined with an image acquisition device, it records the dynamic process of soil particles desorbing, rising, and migrating on the tray surface, enabling deeper analysis of the microscopic mechanism of particles during wind erosion. This fills the gap in traditional wind tunnel devices and large-scale experimental devices, which cannot accurately capture the details of particle motion. The tray, equipped with a container to hold soil particles, allows for both multi-particle and single-particle experiments, facilitating data acquisition under various operating conditions. Furthermore, the use of a small experimental pipe provides greater flexibility and lower experimental costs compared to traditional large-scale wind tunnel experimental devices. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a small-scale pipeline-type resuspension microscopic mechanism experimental device according to the present invention; Figure 2 For the present invention Figure 1 A magnified schematic diagram of the local structure at point A; Figure 3 This is a schematic diagram of the tray structure of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Air supply equipment; 2. Test pipeline; 21. Rectifying section; 22. Test section; 3. Rectifying assembly; 31. Rectifying grid; 311. First rectifying grid; 312. Second rectifying grid; 313. Third rectifying grid; 32. Turbulence attenuation net; 321. First turbulence attenuation net; 322. Second turbulence attenuation net; 4. Tray; 41. Receiving part; 5. Image acquisition equipment; 6. First velocity measuring element; 7. Controller; 8. Second velocity measuring element. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0023] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] To address the problems existing in the prior art, this application provides a small-scale pipeline-type resuspension microscopic mechanism experimental device.

[0025] like Figures 1-3 As shown, a small-scale pipeline-type resuspension microscopic mechanism experimental device includes an air supply device 1, a test pipeline 2, a rectifier assembly 3, a tray 4, and an image acquisition device 5. The air outlet of the air supply device 1 is connected to the inlet of the test pipeline 2. The rectifier assembly 3 and the tray 4 are sequentially arranged inside the test pipeline 2 from the inlet to the outlet. The rectifier assembly 3 is used to rectify the airflow output by the air supply device 1 to form uniform and stable turbulence, and includes a rectifier grid 31 and a turbulence attenuation net 32. The rectifier grid 31 and the turbulence attenuation net 32 ​​are sequentially arranged from the inlet to the outlet of the test pipeline 2. The tray 4 and the test pipeline 2 are both horizontally arranged, and the top surface of the tray 4 has a receiving part 41. The receiving part 41 is used to receive soil particles. The image acquisition device 5 is used to acquire images when the soil particles are moving.

[0026] This invention provides a small-scale pipeline-type microscopic mechanism experimental device for resuspension. Based on rectifying the airflow output from the air supply device using a rectifying component 3 to form a uniform and stable turbulent flow, it provides a standardized hydrodynamic environment for soil particle resuspension experiments. This solves the problems of large data fluctuations and poor reproducibility caused by uneven turbulence in existing mainstream devices, thereby improving the reliability and accuracy of the experiment. Combined with an image acquisition device 5, it records the dynamic process of soil particles desorbing, rising, and migrating on the surface of the tray 4, enabling a deeper analysis of the microscopic mechanisms of particles during wind erosion. This fills the gap in traditional wind tunnel devices and large experimental devices that cannot accurately capture the details of particle movement. The tray 4, equipped with a receiving part 41 to hold soil particles, allows for both multi-particle and single-particle experiments, facilitating data acquisition under various working conditions. The use of a small experimental pipeline 2 provides greater flexibility and lower experimental costs compared to traditional large wind tunnel experimental devices.

[0027] In some preferred embodiments, a multi-layer turbulence attenuation net 32 ​​is included; the multi-layer turbulence attenuation nets 32 are spaced apart, and the first turbulence attenuation net 32 ​​is attached to the flow straightening grid 31; based on this, small-scale turbulence can be effectively attenuated, reducing the turbulence intensity to the experimental requirements, and the method of attaching the first turbulence attenuation net 32 ​​to the flow straightening grid 31 and the others being spaced apart can prevent the generation of eddies, reduce fluid kinetic energy loss, and further improve the effect of turbulence attenuation.

[0028] Preferably, the turbulence attenuation mesh 32 is a wire mesh with a mesh opening diameter of 0.1 mm and a thickness of 0.2 mm; under these conditions, the attenuation effect can be guaranteed and the flow resistance can be reduced.

[0029] Preferably, the turbulence attenuation net 32 ​​includes a first turbulence attenuation net 321 and a second turbulence attenuation net 322; the distance H between the first turbulence attenuation net 321 and the second turbulence attenuation net 322 is 2cm; based on this interval setting, it can ensure sufficient attenuation of the fluid, form a more stable and uniform flow field, and reduce gas flow loss.

[0030] In some preferred embodiments, both the rectifier grid 31 and the turbulence attenuation net 32 ​​are arranged perpendicular to the axial direction of the test pipe 2.

[0031] In some preferred embodiments, the test pipe 2 is made of fiberglass.

[0032] In some preferred embodiments, the inner wall of the test pipe 2 is coated with an antistatic coating, such as PEDOT:PSS dip coating or industrial antistatic liquid. This ensures that the particles in the resuspension experiment are not affected by static electricity.

[0033] In some preferred embodiments, the test pipe 2 includes a rectifier section 21 and a test section 22 in sequence; the rectifier assembly 3 is disposed in the rectifier section 21, the tray 4 is disposed in the test section 22, the diameter of the test section 22 is smaller than that of the rectifier section 21, and the connection position of the two gradually narrows.

[0034] Preferably, the inner diameter of the test section 22 is 50 mm; the inner diameter of the rectifier section 21 is 90 mm.

[0035] Preferably, the cross-sectional shape of the test section 22 is formed by an upper arc section and a lower straight section. Based on this, the tray 4 can be integrated on the bottom surface of the test section 22, that is, the receiving part 41 can be set on the bottom surface inside the test section 22. This simplifies the structure, and setting the bottom surface inside the test section 22 as a plane is also more conducive to the stability of turbulence.

[0036] Preferably, the bottom surface of the test pipe 2 is a plane.

[0037] In some preferred embodiments, the rectifier grid 31 is a honeycomb mesh (i.e., a regular hexagonal perforated mesh), and the rectifier grid 31 includes a first rectifier grid 311, a second rectifier grid 312, and a third rectifier grid 313. The first rectifier grid 311, the second rectifier grid 312, and the third rectifier grid 313 are sequentially attached along the inlet to outlet direction of the test pipe 2, and the inscribed circle diameters of the first rectifier grid 311, the second rectifier grid 312, and the third rectifier grid 313 are 8.2 mm, 6.4 mm, and 3.2 mm, respectively, and the thicknesses are 0.8 mm, 0.6 mm, and 0.5 mm, respectively. This breaks the swirling flow at the fan outlet, suppresses large-size eddies, and completes the functions of rectification and uniform flow.

[0038] In some preferred embodiments, both the rectifier grille 31 and the turbulence attenuation mesh 32 are made of stainless steel.

[0039] In some preferred embodiments, the distance L between the tray 4 and the rectifier assembly 3 is greater than or equal to four times the distance between the test pipe 2 and the rectifier assembly 3 to ensure turbulence stability.

[0040] Preferably, it includes multiple receiving parts 41; the percentage of the multiple receiving parts 41 to the top surface area of ​​the tray 4 is less than or equal to 30%; thereby ensuring the test recording effect while reducing the impact on the natural distribution of the flow field.

[0041] Preferably, the receiving part 41 is a countersunk hole with a diameter of 1 mm; adopting a countersunk hole of this diameter not only meets the requirements of commonly used particle sizes in experiments, but also takes into account the problem of cleaning the experimental device to prevent static electricity and fine particle blockage.

[0042] Preferably, the receiving part 41 is a sink hole with an arc-shaped cross-section that is larger at the top and smaller at the bottom. This avoids the problem of soil particles accumulating inside the receiving part 41 and being difficult to remove, and it is more in line with the real-world state of soil particle suspension and flow during the experiment.

[0043] In some preferred embodiments, when soil particles of different sizes are placed in the receiving part 41, the soil particles should be exposed in the receiving part 41 to ensure that the soil particles are in contact with the airflow.

[0044] In some preferred embodiments, the tray 4 is made of 304 stainless steel, which has good corrosion resistance and structural stability.

[0045] In some preferred embodiments, a first velocity measuring element 6 is also included; the first velocity measuring element 6 is used to measure the velocity at the outlet side of the rectifier assembly 3; the air supply device 1 is a variable frequency fan. By adjusting the speed of the variable frequency fan, accurate and controllable adjustment within the wind speed range of 0.1-16 m / s (approximately level 0-8 wind speed) can be achieved, thereby enabling the acquisition of experimental data under different operating conditions.

[0046] Preferably, a second flow velocity measuring element 8 is also provided on the outlet side of the test pipe 2 for measuring the outlet flow velocity.

[0047] Preferably, both the first velocity measuring element 6 and the air supply device 1 are connected to the controller 7. The controller 7 controls the frequency of the air supply device 1 based on the comparison between the required wind speed and the first velocity measuring element 6. This allows for real-time adjustment of the wind speed and provides feedback, ensuring precise control of the airflow environment during the experiment and avoiding the problems of unstable wind speed and poor flow field uniformity found in traditional large-scale wind tunnels. Simultaneously, it also enables a slow and stable increase in wind speed, thereby allowing for the measurement of the critical desorption wind speed.

[0048] Preferably, the first velocity measuring element 6 and the second velocity measuring element 8 are both Pitot tube flow meters.

[0049] In some preferred embodiments, the test pipe 2 is made of a transparent material at the position corresponding to the tray 4, so that the image acquisition device 5 can acquire images of soil particles from outside the test pipe 2.

[0050] Preferably, a reflective film is coated on the transparent material to ensure that the image acquisition device 5 can clearly capture the dynamic process of particles detaching from the tray surface, being lifted up, and migrating.

[0051] In some preferred embodiments, the image acquisition device 5 is a high-speed camera.

[0052] In some preferred embodiments, the tray 4 is embedded in the inner wall of the test pipe 2.

[0053] The working method of this invention is described as follows: Airflow regulation: By cooperating with the air supply device 1 and the first velocity measuring element 6, the airflow velocity in the test pipe 2 is precisely adjusted to achieve accurate and controllable changes in wind speed within the range of 0.1-16 m / s.

[0054] Turbulence generation: The airflow delivered by the air supply device 1 forms a uniform and stable turbulent flow field through the combined action of the rectifier grid 31 and the turbulence attenuation net 32. By controlling the inflow wind speed, the wind erosion migration process of soil particles under different flow field conditions can be simulated.

[0055] Particle dynamic monitoring: Soil particles are evenly placed on the support tray 4, and the desorption, lifting, and migration processes of the particles are recorded in real time using a high-speed camera (frame rate ≥1000 fps). An image acquisition device 5 equipped with multiple macro lenses is used to select the appropriate lens according to the needs of different experiments, clearly capturing the movement process of single particles, multiple particles, and single-layer particles at different magnifications for subsequent frame-by-frame slow-motion observation. Based on high-definition image acquisition, coupled analysis of particle motion trajectory and flow field data is provided.

[0056] Multi-parameter experimental design: Using an orthogonal matrix experimental method, multiple parameters such as wind speed, particle size, and pollutant doping rate (capable of testing various solid pollutant particles; doping rate is controlled by adjusting the quality of the incorporated pollutants) are adjusted to conduct multi-factor coupled experiments. This obtains key data on the wind erosion migration process, providing experimental data support for microscopic mechanism analysis and fundamental data for in-depth research on the effects of pollutant doping on particle resuspension and migration. This overcomes the limitations of existing technologies that typically focus on the influence of only a single variable, providing comprehensive and detailed experimental data on the complex resuspension behavior of soil particles and advancing a deeper understanding of the microscopic mechanisms of resuspension of contaminated soil particles.

[0057] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A small-scale tubular resuspension microscopic mechanism experimental device, characterized in that, This includes air supply equipment, test piping, rectifier components, trays, and image acquisition equipment; The air outlet of the air supply device is connected to the inlet of the test pipeline; The rectifier assembly and the tray are sequentially arranged inside the test pipe from the inlet to the outlet. The rectifier assembly is used to rectify the airflow output by the air supply device to form a uniform and stable turbulent flow, and includes a rectifier grid and a turbulence attenuation net. The rectifier grid and the turbulence attenuation net are arranged sequentially from the inlet to the outlet of the test pipeline; Both the tray and the test pipe are horizontally arranged, and the top surface of the tray has a receiving part; the receiving part is used to hold soil particles; The image acquisition device is used to acquire images during the movement of the soil particles.

2. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 1, characterized in that, It includes multiple layers of the turbulence attenuation mesh; the multiple layers of the turbulence attenuation mesh are spaced apart, and the first turbulence attenuation mesh is attached to the rectifier grid.

3. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 2, characterized in that, The turbulence attenuation mesh is a wire mesh with a mesh opening diameter of 0.1 mm and a thickness of 0.2 mm.

4. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 2, characterized in that, The turbulence attenuation network includes a first turbulence attenuation network and a second turbulence attenuation network; the distance between the first turbulence attenuation network and the second turbulence attenuation network is 2 cm.

5. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 1, characterized in that, The rectifying grid is a honeycomb mesh and includes a first rectifying grid, a second rectifying grid, and a third rectifying grid. The first rectifying grid, the second rectifying grid, and the third rectifying grid are sequentially attached to each other along the inlet to outlet direction of the test pipe. The inscribed circle diameters of the first rectifying grid, the second rectifying grid, and the third rectifying grid are 8.2 mm, 6.4 mm, and 3.2 mm, respectively, and the thicknesses are 0.8 mm, 0.6 mm, and 0.5 mm, respectively.

6. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 1, characterized in that, The distance between the tray and the rectifier assembly is greater than or equal to four times the length of the test pipe.

7. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 1, characterized in that, It includes multiple receiving portions; the percentage of the multiple receiving portions to the top surface area of ​​the tray is less than or equal to 30%.

8. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 1, characterized in that, The receiving part is a countersunk hole with a diameter of 1 mm.

9. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 1, characterized in that, It also includes a first flow velocity measuring element; the first flow velocity measuring element is used to measure the flow velocity on the outlet side of the rectifier assembly; the air supply equipment is a variable frequency fan.

10. The small-scale pipeline-type resuspension microscopic mechanism experimental device according to claim 1, characterized in that, The test pipe is made of transparent material at the position corresponding to the tray, so that the image acquisition device can acquire images of the soil particles from outside the test pipe.

Images