A Marangoni effect testing device

Abstract

The present invention provides a Marangoni effect test device, including a cold water tank, a first water pump, a precision pump, a main water tank, a waste water tank, a hot water tank and a high temperature water pump, wherein the cold water tank is connected to the first water pump through an input pipe, the first water pump is installed on the outer wall of the first filter tank side, the output pipe outlet of the first water pump is located directly above the first filter tank, a precision pump is connected to one side of the first filter tank, a flow stabilizing pipe is connected to the outlet of the precision pump, a main water tank is provided at the outlet of the flow stabilizing pipe, one end of the main water tank away from the flow stabilizing pipe is connected to the waste water tank through a waste water pipe, a second two-way water valve is provided on the waste water pipe, the waste water pipe is connected to the second first filter tank end through the second two-way water valve through an L-shaped pipe, and the other end of the second filter tank is connected to the hot water tank through a high temperature water pump. The present invention can record the data of the Marangoni effect inside it through thermal imaging equipment, cameras and thermal imaging equipment, so that experimenters can obtain experimental data more intuitively.

Description

Technical Field

[0001] The invention relates to the technical field of light-controlled fluid motion, and in particular to a Marangoni effect testing device. Background Art

[0002] The Marangoni effect, the phenomenon of surface tension gradient difference, needs to be studied in the fields of materials science, microfluidics, heat conduction and cooling technology, and biomedicine. This is an important physical phenomenon, and the device can provide students with an intuitive experimental environment to help them better understand the Marangoni effect, grasp the basic concepts of liquid surface tension and how it affects fluid movement.

[0003] The existing published patent number is: US20090020426A1, which records that low-energy light illumination and doped semiconductor surfaces or surface plasmon support surfaces are combined for manipulating fluids on the surface without any applied electric field or flow channel. Precise control of fluid flow is achieved by applying focused or tightly collimated low-energy light to the surface-fluid interface. In the first embodiment, with appropriate dopant levels in the semiconductor substrate, optically excited charge carriers are moved to the surface when illuminated. In the second embodiment, with a thin film noble metal surface on a dispersive substrate, optically excited surface plasmons for fluid manipulation are generated. This electrodeless optical control of the Marangoni effect provides reconfigurable operation of fluid flow, paving the way for reprogrammable microfluidic devices.

[0004] Although the above scheme with electrodeless optical control of Marangoni effect provides reconfigurable operation of fluid flow, thus paving the way for reprogrammable microfluidic devices, it may not be used to intuitively demonstrate and deeply study the Marangoni effect, i.e. the phenomenon of surface tension gradient difference, during use. This is an important physical phenomenon with important applications in many fields of science and engineering, such as materials science, microfluidics, heat conduction and cooling technology, and biomedicine, but it cannot be intuitively demonstrated to simulate and study some practical engineering problems, such as liquid phase processing, microfluidic actuation, high-performance cooling, etc., in which the Marangoni effect plays a key role. Summary of the invention

[0005] The purpose of the present invention is to provide a Marangoni effect testing device to solve the problem that the existing testing device cannot be used for intuitive demonstration and in-depth study of the Marangoni effect, and cannot intuitively demonstrate simulation and study some practical engineering problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A Marangoni effect testing device comprises a cold water tank, a first water pump, a precision pump, a main water tank, a waste water tank, a hot water tank and a high temperature water pump, wherein the cold water tank is connected to the first water pump through an input pipe, the first water pump is installed on the outer wall of the first filter tank side, the output pipe outlet of the first water pump is located directly above the first filter tank, the first filter tank is connected to the precision pump on the side away from the cold water tank, the precision pump is connected to a flow stabilizing pipe at the outlet, one end of the flow stabilizing pipe is connected to the precision pump, and the main water tank is arranged at the outlet of the other end, the end of the main water tank away from the flow stabilizing pipe is connected to the waste water tank through a waste water pipe, a second two-way water valve is arranged on the waste water pipe, the waste water pipe is connected to the second first filter tank end through the second two-way water valve and an L-shaped pipe, and the other end of the second filter tank is connected to the hot water tank through the high temperature water pump.

[0008] Specifically, an insulation layer is provided in the cold water tank, and multiple cooling pipes are installed at the bottom end of the cold water tank, and a first thermometer is installed on an outer wall surface of the cold water tank; the first filter tank is movably connected to the inside of the first filter tank, and hollow holes are evenly opened on the first filter tank; the first filter tank is connected to two fixed blocks on the outer surface on the side away from the first water pump, and a threaded rod is movably embedded in the fixed block, and one end of the threaded rod is connected to a semicircular movable block through a bearing, and the outer surface of the semicircular movable block is fixedly connected to a limited telescopic rod, and the first filter tank is connected to a fixed semicircular block on the side close to the two fixed blocks, and a long rod is movably embedded in the outer surface of the fixed semicircular block, and the long rod is movably embedded in the hollow hole.

[0009] In the above technical solution, rotating the threaded rod causes the semicircular movable block to move to one side. At this time, the movement of the semicircular movable block is limited by the limiting telescopic rod. When the semicircular movable block moves inward, the long rod can be clamped inside it to fix the long rod, thereby completing the locking of the first filter screen; rotating the threaded rod in the opposite direction causes the semicircular movable block to move outward to release the long rod. At this time, the long rod is pulled to disengage it from the hollow hole inside the first filter screen, thereby releasing the fixation of the first filter screen and making it easy to disassemble, making it convenient for the experimenter to clean the first filter screen.

[0010] Specifically, a through pipe is connected to the bottom of the first filter tank, one end of the through pipe is connected to the bottom of the first filter tank, and the other end is connected to the input end of the precision pump. The output end of the precision pump is connected to the flow stabilizing tube through a precision flow meter. A first two-way water valve is provided at the end of the flow stabilizing tube away from the precision flow meter. A second thermometer is installed on the first two-way water valve. A buffer tube is connected to the bottom of the first two-way water valve. A buffer water tank is provided at the outlet of the buffer tube away from the first two-way water valve.

[0011] In the above technical solution, the second thermometer can be used to test whether the temperature of the cooling solution reaches the test standard. When the water flow is too large, the solution can be diverted through the main water tank to the buffer tube to reach the inside of the buffer water tank, thereby effectively buffering the cooling solution.

[0012] Specifically, a third thermometer is provided inside the main water tank, and a particle releaser is provided inside the main water tank near the third thermometer. A photoelectric scanner, a camera and a thermal imaging device are fixedly connected side by side directly above the main water tank, and the centers of the photoelectric scanner, the camera and the thermal imaging device are located on the same horizontal line.

[0013] In the above technical solution, a steady flow tube is used to collect particles that rise due to the surface tension gradient difference caused by the Marangoni effect. The mass of these particles is weighed by a precision scale or a sensor, and the specific numerical value of the surface tension difference caused by the Marangoni effect can be calculated. Combined with the temperature and other physical quantities provided by the second thermometer, more in-depth research and analysis can be carried out.

[0014] Furthermore, the data of the internal Marangoni effect can be recorded by photoelectric scanners, cameras, and thermal imaging equipment, allowing experimenters to see the experimental data more intuitively. The high-temperature solution will reach the inside of the main water tank, and the temperature of the solution inside the main water tank will be measured by the third thermometer. When the solution flows into the main water tank, through the action of the particle releaser, it can be observed that the particles move upward from the hot water along the cold water. This is because the surface tension of the cold water is greater than the surface tension of the hot water, and the influence of the presence of the particles forms a surface tension gradient.

[0015] Specifically, a second water pump is provided on the L-shaped tube, a bent pipe is provided between the second water pump and the second filter tank, one end of the bent pipe is connected to the L-shaped tube, and the other end is connected to the bottom of the second filter tank, a second filter screen is movably connected inside the second filter tank, and a clamping hole is opened on the side of the second filter screen.

[0016] In the above technical solution, the cooling solution will reach the inside of the main water tank. At the same time, the high-temperature water pump is started to extract the high-temperature solution inside the hot water tank and input it into the inside of the second filter tank. At the same time, the second filter screen inside the second filter tank filters the high-temperature solution to reduce internal impurities.

[0017] Furthermore, the second pump is started to extract the solution in the second filter tank and then input it into the second two-way water valve through the L-shaped pipe, and the waste liquid is discharged into the wastewater tank through the wastewater pipe. At the same time, the high-temperature solution will enter the main water tank.

[0018] Specifically, an L-shaped fixing plate is installed on the outer surface of the second filter trough, and a short rod is movably embedded inside the L-shaped fixing plate. One end of the short rod is connected to a convex plate, and a spring is installed on the outer surface of the convex plate. One end of the spring is connected to the convex plate, and the other end is connected to the inner surface of the L-shaped fixing plate. The inner surface of the convex plate is connected to a clamping rod, and the clamping rod is movably embedded in the clamping hole.

[0019] In the above technical solution, the short rod is pulled to disengage the clamping rod from the inside of the clamping hole, so that the second filter screen can be disassembled from the inside thereof to facilitate the experimenter to clean it.

[0020] Furthermore, after the second filter screen is cleaned, when the spring is not subjected to external force, the clamping rod is firmly clamped inside the clamping hole under the action of the spring, thereby completing the fixing of the second filter screen.

[0021] Compared with the prior art, the advantages and positive effects of the present invention are:

[0022] 1. When the present invention is in use, the cooling pipe cools the solution inside the cold water tank. After cooling, the temperature of the internal solution can be observed by the first thermometer to determine whether the cooling temperature has been reached. Then, the first water pump is started to input the solution into the first filter tank through the input pipe. Then, the cooling solution is filtered through the first filter screen to filter out impurities in the solution, thereby improving the efficiency of subsequent test processing.

[0023] 2. When the present invention is in use, the precision pump is started to input the cooling solution into the interior of the flow stabilizing tube. The flow rate of the cooling solution after being drawn out by the precision pump is observed through the precision flowmeter. After reaching the flow stabilizing tube, the flow stabilizing tube can be used to collect particles that rise due to the surface tension gradient difference caused by the Marangoni effect. The mass of these particles is weighed by a precision scale or a sensor, and the specific numerical value of the surface tension difference caused by the Marangoni effect can be calculated. Combined with the temperature and other physical quantities provided by the second thermometer, more in-depth research and analysis can be carried out; at the same time, the second thermometer can be used to test whether the temperature of the cooling solution meets the test standard. When the water flow is too large, the solution can be diverted to the buffer tube through the main water tank to reach the interior of the buffer water tank, thereby effectively buffering the cooling solution; during the test, the photoelectric scanner, camera, and thermal imaging equipment can be used to record the internal Marangoni effect data, allowing the experimenter to see the experimental data more intuitively.

[0024] 3. After use, the present invention rotates the threaded rod to move the semicircular movable block outward to loosen the long rod. At this time, the long rod is pulled to disengage it from the hollow hole inside the first filter screen, thereby releasing the fixation of the first filter screen, allowing it to be easily disassembled and making it convenient for experimenters to clean the first filter screen. In addition, by pulling the short rod to disengage the clamping rod from the inside of the clamping hole, the second filter screen can be disassembled from the inside thereof to facilitate experimenters to clean it. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a Marangoni effect testing device provided by the present invention;

[0026] Figure 2 A schematic diagram of the top view of a Marangoni effect testing device provided by the present invention;

[0027] Figure 3 for Figure 2 A magnified schematic diagram of the structure at center A;

[0028] Figure 4 for Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0029] Figure 5 is a schematic diagram of the internal structure of the second filter;

[0030] Figure 6 is a schematic diagram of the internal structure of the first filter;

[0031] Figure 7 A partial structural diagram of a Marangoni effect testing device provided by the present invention

[0032] Figure 8 The present invention provides a schematic diagram of the rear view structure of a Marangoni effect testing device.

[0033] Explanation of reference numerals in the figure: 101, cold water tank; 102, insulation layer; 103, first thermometer; 104, cooling pipe; 105, first filter tank; 106, first water pump; 107, first filter screen; 108, hollow hole; 109, long rod; 110, threaded rod; 111, fixed block; 112, limited telescopic rod; 113, semicircular movable block; 114, fixed semicircular block; 115, input pipe; 116, output pipe; 117, through pipe; 118, precision pump; 119, precision flow meter; 120, flow stabilizing pipe; 121, first double-way water valve; 122, second thermometer; 1 23. Buffer water tank; 124. Thermal imaging device; 125. Camera; 126. Photoelectric scanner; 127. Third thermometer; 128. Particle releaser; 129. Main water tank; 130. Second two-way water valve; 131. Wastewater pipe; 132. Wastewater tank; 133. Hot water tank; 134. High-temperature water pump; 135. Second filter tank; 136. Second filter screen; 137. Clamp hole; 138. Short rod; 139. Boss; 140. Clamp rod; 141. Spring; 142. L-shaped fixing plate; 144. Second water pump; 143. Bend pipe; 145. L-shaped pipe; 146. Buffer pipe. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0035] like Figure 1 As shown, a Marangoni effect testing device includes a cold water tank 101, a first water pump 106, a precision pump 118, a main water tank 129, a waste water tank 132, a high temperature water pump 134 and a hot water tank 133. The cold water tank 101 is connected to the first water pump 106 through an input pipe 115. The first water pump 106 is installed on the outer wall of one side of the first filter tank 105. The outlet of the output pipe 116 of the first water pump 106 is located directly above the first filter tank 105. The first filter tank 105 is connected to the precision pump 118 on the side away from the cold water tank 101. A flow stabilizing tube 120 is connected to the outlet of the precision pump 118. One end of the flow stabilizing tube 120 is connected to the precision pump 118, and a main water tank 129 is provided at the outlet of the other end. The end of the main water tank 129 away from the flow stabilizing tube 120 is connected to the wastewater tank 132 through a wastewater pipe 131. A second two-way water valve 130 is provided on the wastewater pipe 131. The wastewater pipe 131 is connected to one end of the second filter tank 135 through the second two-way water valve 130 via an L-shaped tube 145. The other end of the second filter tank 135 is connected to the hot water tank 133 through a high-temperature water pump 134.

[0036] like Figure 2 As shown, the cold water tank 101 is provided with an insulation layer 102, a plurality of cooling pipes 104 are installed at the bottom of the cold water tank 101, and a first thermometer 103 is installed on an outer wall of the cold water tank 101; Figure 6 As shown, the first filter tank 105 is movably connected to a first filter screen 107, and the first filter screen 107 is evenly provided with hollow holes 108. Figure 3 As shown, the first filter trough 105 is connected to two fixed blocks 111 on the outer surface of the side away from the first water pump 106, and a threaded rod 110 is movably embedded inside the fixed block 111. One end of the threaded rod 110 is connected to a semicircular movable block 113 through a bearing, and the outer surface of the semicircular movable block 113 is fixedly connected to a limited telescopic rod 112. The first filter trough 105 is connected to a fixed semicircular block 114 on the side close to the two fixed blocks 111, and a long rod 109 is movably embedded on the outer surface of the fixed semicircular block 114, and the long rod 109 is movably embedded in the hollow hole 108.

[0037] A through pipe 117 is connected to the bottom of the first filter tank 105, one end of the through pipe 117 is connected to the bottom of the first filter tank 105, and the other end is connected to the input end of the precision pump 118. The output end of the precision pump 118 is connected to the flow stabilizing tube 120 through a precision flow meter 119. The end of the flow stabilizing tube 120 away from the precision flow meter 119 is provided with a first two-way water valve 121, and a second thermometer 122 is installed on the first two-way water valve 121. A buffer tube 146 is connected to the bottom of the first two-way water valve 121, and a buffer water tank 123 is provided at the outlet of the buffer tube 146 away from the first two-way water valve 121.

[0038] like Figure 7 As shown, a third thermometer 127 is provided inside the main water tank 129, and a particle releaser 128 is provided inside the main water tank 129 near the third thermometer 127. A photoelectric scanner 126, a camera 125 and a thermal imaging device 124 are fixedly connected side by side directly above the main water tank 129, and the centers of the photoelectric scanner 126, the camera 125 and the thermal imaging device 124 are located on the same horizontal line.

[0039] The L-shaped tube 145 is provided with a second water pump 144, and a curved tube 143 is provided between the second water pump 144 and the second filter tank 135. One end of the curved tube 143 is connected to the L-shaped tube 145, and the other end is connected to the bottom of the second filter tank 135. Figure 5 As shown, a second filter screen 136 is movably connected inside the second filter slot 135 , and a clamping hole 137 is opened on the side of the second filter screen 136 .

[0040] like Figure 4 As shown, an L-shaped fixing plate 142 is installed on the outer surface of the second filter slot 135, and a short rod 138 is movably embedded inside the L-shaped fixing plate 142. One end of the short rod 138 is connected to a boss 139. A spring 141 is installed on the outer surface of the boss 139. One end of the spring 141 is connected to the boss 139, and the other end is connected to the inner surface of the L-shaped fixing plate 142. The inner surface of the boss 139 is connected to a clamping rod 140, and the clamping rod 140 is movably embedded in the clamping hole 137.

[0041] How it works

[0042] like Figure 8As shown, when in use, the cooling pipe 104 cools the solution inside the cold water tank 101. After cooling, the temperature of the solution inside the cold water tank 101 is observed through the first thermometer 103 to observe whether the cooling temperature is reached, and then the first water pump 106 is started to input the cooling solution into the first filter tank 105 through the input pipe 115, and then the cooling solution is filtered through the first filter screen 107 to filter out impurities in the solution to improve the efficiency of subsequent test processing; thereafter, the precision pump 118 is started to input the cooling solution into the interior of the steady flow tube 120, and the flow rate of the cooling solution after being drawn out by the precision pump 118 is observed through the precision flowmeter 119. After reaching the steady flow tube 120, the particles that rise due to the surface tension gradient difference caused by the Marangoni effect are collected through the steady flow tube 120. The mass of these particles is weighed by a precision scale or sensor, and the specific numerical value of the surface tension difference caused by the Marangoni effect can be calculated. Combined with the physical quantities such as temperature provided by the second thermometer 122, more in-depth research and analysis can be carried out. At the same time, the second thermometer 122 can test whether the temperature of the cooling solution reaches the test standard (when the water flow is too large, the solution can be diverted to the buffer pipe 146 through the main water tank 129 to reach the inside of the buffer water tank 123 to effectively buffer the cooling solution). When the cooling solution reaches the inside of the main water tank 129, the high-temperature water pump 134 is started to extract the high-temperature solution in the hot water tank 133 and input it into the inside of the second filter tank 135, and the second filter screen 136 in the second filter tank 135 filters the high-temperature solution to reduce the impurities inside it, and then the second pumping pump 144 is started to extract the solution in the second filter tank 135 and then input it into the inside of the second two-way water valve 130 through the L-shaped pipe 145. At the same time, the waste pipe 131 will waste the waste water. The liquid is discharged into the waste water tank 132, and the high temperature solution will reach the inside of the main water tank 129. The temperature of the solution in the main water tank 129 is measured by the third thermometer 127. When the solution flows into the main water tank 129, through the action of the particle releaser 128, it can be observed that the particles move upward from the hot water along the cold water. This is because the surface tension of the cold water is greater than the surface tension of the hot water, and the influence of the presence of the particles forms a surface tension gradient, which causes the liquid to move from the hot water area with lower surface tension to the cold water area with higher surface tension, and at the same time drives the particles to move. The photoelectric scanner 126, the camera 125 and the thermal imaging device 124 can be used to record the data of the internal Marangoni effect, so as to have a more intuitive understanding of the experimental process.

[0043] Filter cleaning:

[0044] ① Rotate the threaded rod 110 to move the semicircular movable block 113 to one side. At this time, the movement of the semicircular movable block 113 is limited by the limiting telescopic rod 112. When the semicircular movable block 113 moves inward, the long rod 109 can be clamped inside it to fix the long rod 109, thereby completing the locking of the first filter screen 107; rotate the threaded rod 110 in the opposite direction to move the semicircular movable block 113 outward to release the long rod 109. At this time, pull the long rod 109 to disengage it from the hollow hole 108 inside the first filter screen 107, thereby releasing the fixation of the first filter screen 107, making it easy to disassemble and convenient for the experimenter to clean the first filter screen 107.

[0045] ② In the absence of external force, the clamping rod 140 is firmly clamped in the clamping hole 137 under the action of the spring 141, so that the second filter 136 is fixed. The short rod 138 is pulled to make the clamping rod 140 detach from the inside of the clamping hole 137, so that the second filter 136 can be removed from the inside for easy cleaning.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A Marangoni effect testing device, characterized in that: The invention comprises a cold water tank (101), a first water pump (106), a precision pump (118), a main water tank (129), a waste water tank (132), a high temperature water pump (134) and a hot water tank (133), wherein the cold water tank (101) is connected to the first water pump (106) via an input pipe (115), the first water pump (106) is installed on an outer wall of one side of a first filter tank (105), the outlet of the output pipe (116) of the first water pump (106) is located directly above the first filter tank (105), the side of the first filter tank (105) away from the cold water tank (101) is connected to the precision pump (118), the precision pump (118) 18) A flow stabilizing tube (120) is connected to the outlet, one end of the flow stabilizing tube (120) is connected to the precision pump (118), and a main water tank (129) is provided at the outlet of the other end, and one end of the main water tank (129) away from the flow stabilizing tube (120) is connected to the waste water tank (132) through a waste water pipe (131), and a second two-way water valve (130) is provided on the waste water pipe (131), and the waste water pipe (131) is connected to one end of the second filter tank (135) through the second two-way water valve (130) via an L-shaped pipe (145), and the other end of the second filter tank (135) is connected to the hot water tank (133) through a high-temperature water pump (134); A third thermometer (127) is provided inside the main water tank (129), and a particle releaser (128) is provided inside the main water tank (129) near the third thermometer (127). A photoelectric scanner (126), a camera (125), and a thermal imaging device (124) are fixedly connected side by side directly above the main water tank (129), and the centers of the photoelectric scanner (126), the camera (125), and the thermal imaging device (124) are located on the same horizontal line.

2. A Marangoni effect testing device according to claim 1, characterized in that: The cold water tank (101) is provided with a heat-insulating layer (102), a plurality of cooling pipes (104) are installed at the bottom of the cold water tank (101), and a first thermometer (103) is installed on an outer wall surface of the cold water tank (101); a first filter screen (107) is movably connected to the inside of the first filter tank (105), and hollow holes (108) are evenly formed on the first filter screen (107); the outer surface of the first filter tank (105) on a side away from the first water pump (106) is connected to two fixing blocks (111), and the fixing blocks (111) are connected to the outer surface of the first filter tank (105) on a side away from the first water pump (106). A threaded rod (110) is movably embedded inside the fixed block (111); one end of the threaded rod (110) is connected to a semicircular movable block (113) via a bearing; the outer surface of the semicircular movable block (113) is fixedly connected to a limited telescopic rod (112); a fixed semicircular block (114) is connected to one side of the first filter slot (105) close to the two fixed blocks (111); a long rod (109) is movably embedded on the outer surface of the fixed semicircular block (114); and the long rod (109) is movably embedded in the hollow hole (108).

3. The Marangoni effect testing device according to claim 1, characterized in that: A through pipe (117) is connected to the bottom of the first filter tank (105); one end of the through pipe (117) is connected to the bottom of the first filter tank (105), and the other end is connected to the input end of a precision pump (118); the output end of the precision pump (118) is connected to a flow stabilizing tube (120) via a precision flow meter (119); a first two-way water valve (121) is provided at one end of the flow stabilizing tube (120) away from the precision flow meter (119); a second thermometer (122) is installed on the first two-way water valve (121); a buffer pipe (146) is connected to the bottom of the first two-way water valve (121); a buffer water tank (123) is provided at the outlet of one end of the buffer pipe (146) away from the first two-way water valve (121).

4. The Marangoni effect testing device according to claim 1, characterized in that: A second water pump (144) is provided on the L-shaped tube (145); a bent tube (143) is provided between the second water pump (144) and the second filter tank (135); one end of the bent tube (143) is connected to the L-shaped tube (145), and the other end is connected to the bottom of the second filter tank (135); a second filter screen (136) is movably connected inside the second filter tank (135); a clamping hole (137) is provided on the side of the second filter screen (136).

5. The Marangoni effect testing device according to claim 1, characterized in that: An L-shaped fixing plate (142) is installed on the outer surface of the second filter groove (135), a short rod (138) is movably embedded inside the L-shaped fixing plate (142), one end of the short rod (138) is connected to a convex plate (139), a spring (141) is installed on the outer surface of the convex plate (139), one end of the spring (141) is connected to the convex plate (139), and the other end is connected to the inner surface of the L-shaped fixing plate (142), the inner surface of the convex plate (139) is connected to a clamping rod (140), and the clamping rod (140) is movably embedded inside the clamping hole (137).

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