A Visual Experimental System and Method for Studying Droplet Thermocapillary Phenomena

Abstract

This invention relates to the field of droplet hydrodynamics, specifically to a visualization experimental system and method for studying droplet thermocapillary phenomena. The visualization experimental system for studying droplet thermocapillary phenomena includes: a droplet control device, a heating device, and a data acquisition device. The droplet control device generates two suspended droplets and controls at least one of the suspended droplets to approach and collide with the other droplet in a horizontal direction. The two suspended droplets contain fluorescein and tracer particles. The heating device radiates ultraviolet light onto the two suspended droplets and controls their temperature. The data acquisition device acquires video and real-time images of at least one of the suspended droplets approaching and colliding with the other droplet in a horizontal direction.

Description

Technical Field

[0001] This invention relates to the field of droplet hydrodynamics, specifically to a visualization experimental system and method for studying droplet thermocapillary phenomena. Background Technology

[0002] The interaction between droplets has long been a focus of attention in many fields, including cloud formation, spray combustion, and inkjet printing. Thermal effects significantly influence droplet coalescence and non-coalescence; delayed coalescence or non-coalescence occurs when the temperature difference between two droplets exceeds a certain critical value. This is because the temperature gradient within the droplet leads to a surface tension gradient, causing thermally induced Marangoni convection—thermocapillary convection—within the droplet. In recent years, thermocapillary phenomena, as a fluid dynamic phenomenon driven by a surface tension gradient induced by thermal effects, have attracted widespread attention. The Marangoni effect describes the phenomenon where liquid flows from regions of lower surface tension to regions of higher surface tension when the surface tension is unevenly distributed. The temperature difference between droplets is one of the important factors inducing the Marangoni effect. Therefore, the thermocapillary phenomenon between droplets is of significant research importance.

[0003] However, most existing experimental platforms for droplet coalescence under thermal effects use solid walls to directly or indirectly heat the droplets. Although a significant temperature gradient can be generated inside the droplet through heat conduction, allowing for the observation of thermocapillary convection, the solid wall severely affects the droplet behavior and makes it difficult to study the influence of the temperature difference between the droplet and the surrounding gas phase. Summary of the Invention

[0004] The purpose of this invention is to provide a visualization experimental system for studying droplet thermocapillary phenomena, in order to solve the problems in the existing experimental platforms for studying droplet thermocapillary phenomena due to the influence of solid walls on droplet behavior and the difficulty in studying the influence of temperature difference between droplets and the surrounding gas phase.

[0005] To address the above problems, the technical solution of the visualization experimental system for studying droplet thermocapillary phenomena of the present invention is as follows:

[0006] A visualization experimental system for studying droplet thermocapillary phenomena includes:

[0007] Droplet control device, heating device, and collection device.

[0008] The droplet control device is used to generate two hovering droplets and control at least one of the two hovering droplets to approach and collide with the other hovering droplet in a horizontal direction. The two hovering droplets contain fluorescein and tracer particles.

[0009] The heating device is used to radiate ultraviolet light onto two suspended droplets and control the temperature of the two suspended droplets.

[0010] The acquisition device is used to acquire video and real-time images of at least one of two hovering droplets approaching and colliding with the other hovering droplet in a horizontal direction.

[0011] Furthermore, the two hovering droplets have the same height and volume, and the two hovering droplets move relative to each other and collide simultaneously along the horizontal direction.

[0012] Furthermore, the droplet control device includes a droplet hovering device and a driving device.

[0013] The droplet hovering device is used to generate two hovering droplets;

[0014] The driving device, connected to the droplet hovering device, is used to control at least one of the two hovering droplets to approach and collide with the other hovering droplet in a horizontal direction.

[0015] Furthermore, the driving device includes a lifting mechanism and a horizontal moving mechanism. The two suspended droplets are disposed on the lifting mechanism to control the height of the two suspended droplets. The horizontal moving mechanism is used to control at least one of the two suspended droplets to approach the other suspended droplet in the horizontal direction and collide with it.

[0016] Furthermore, the lifting mechanism includes a lifting track, along which the two suspended droplets move up and down; the horizontal movement mechanism includes a horizontal track, along which the lifting track is set and moves horizontally, thereby driving the two suspended droplets to move horizontally.

[0017] Furthermore, the droplet suspension device includes an injection structure, a capillary tube, and a needle. The injection structure and the needle are respectively connected to the two ends of the capillary tube, and the needle is mounted on a driving device. A liquid containing fluorescein and tracer particles is injected into the injection structure. The liquid containing fluorescein and tracer particles passes through the capillary tube and generates a suspended droplet at the needle.

[0018] Furthermore, the heating device includes an ultraviolet light source and an ultraviolet light power source connected thereto, wherein the radiant heat of the ultraviolet light is adjustable.

[0019] Furthermore, the visualization experimental system also includes a data processing device connected to the acquisition device, used to observe and process video and real-time images of at least one of the two hovering droplets approaching and colliding with the other hovering droplet in a horizontal direction.

[0020] Furthermore, the visualization experimental system also includes a temperature measuring device connected to a data processing device for monitoring the real-time temperature of the two suspended droplets.

[0021] This invention also provides a visualization experimental method for studying droplet thermocapillary phenomena. Based on the above-mentioned visualization experimental system for studying droplet thermocapillary phenomena, the technical solution adopted is as follows:

[0022] A visualization experimental method for studying droplet thermocapillary phenomena includes the following steps:

[0023] S1, activate the droplet control device to generate two hovering droplets, wherein fluorescein and tracer particles are added to the two hovering droplets; activate the heating device to radiate ultraviolet light onto the two hovering droplets.

[0024] S2, control at least one of the two hovering droplets to approach the other hovering droplet in the horizontal direction and collide with it; at the same time, turn on the acquisition device to acquire video and real-time images of at least one of the two hovering droplets approaching the other hovering droplet in the horizontal direction and colliding with it.

[0025] Compared with existing technologies, the visualization experimental system and method for studying droplet thermocapillary phenomena in this application, by adding fluorescein and tracer particles to droplets, can visualize thermocapillary convection between droplets and observe droplet coalescence. Ultraviolet radiation not only excites the fluorescein but also controls and transfers the temperature of the droplets, thereby enabling experiments on the effects of temperature on the internal and surrounding circulation of the droplets. Simultaneously, it effectively avoids interference with the droplets themselves, allowing observation of internal thermocapillary convection and the speed of droplet rotation. Furthermore, the image acquisition device in this invention, by acquiring video and real-time images of at least one of two hovering droplets approaching and colliding with another hovering droplet horizontally, can observe the internal flow and deformation of the droplets during approach and contact, thus obtaining results such as droplet trajectory and circulation speed. This provides effective data support for studying the mechanisms of droplet-droplet coalescence / non-coalescence and droplet-wall interactions.

[0026] The driving device includes a lifting mechanism and a horizontal moving mechanism. The two suspended droplets are mounted on the lifting mechanism to control the height of the two suspended droplets. The horizontal moving mechanism is used to control at least one of the two suspended droplets to approach the other suspended droplet in the horizontal direction and collide with it, so as to effectively control the angle and position of contact between the two droplets, and at the same time control the droplets to approach each other, thereby generating a temperature gradient and causing thermocapillary phenomenon.

[0027] The lifting mechanism includes a lifting track, along which the two suspended droplets move up and down; the horizontal movement mechanism includes a horizontal track, along which the lifting track is set and moves horizontally, thereby driving the two suspended droplets to move horizontally. The structure is simple and easy to operate.

[0028] The droplet hovering device includes an injection structure, a capillary tube, and a needle. The injection structure and the needle are respectively connected to the two ends of the capillary tube, and the needle is mounted on a driving device. A liquid containing fluorescein and tracer particles is injected into the injection structure. The liquid containing fluorescein and tracer particles passes through the capillary tube and generates hovering droplets at the needle, which facilitates the precise generation of two hovering droplets.

[0029] The heating device includes an ultraviolet light source connected to an ultraviolet light power source. The radiant heat of the ultraviolet light is adjustable, which is used to control different temperatures and observe the droplet-droplet coalescence / non-coalescence process and the droplet-wall interaction process at different temperatures.

[0030] The visualization experimental system also includes a temperature measuring device, which is connected to a data processing device to monitor the real-time temperature of two hovering droplets, making it easier to observe the temperature distribution on the droplet surface when the droplets approach and come into contact. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a visualization experimental system for studying droplet thermocapillary phenomena according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the droplet control device in a visualization experimental system for studying droplet thermocapillary phenomena according to an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the drive device in a visualization experimental system for studying droplet thermocapillary phenomena according to an embodiment of the present invention.

[0034] Figure 4 This is a photograph taken by a high-speed camera when a droplet approaches in a visualization experimental system for studying droplet thermocapillary phenomena, as described in an embodiment of the present invention.

[0035] In the diagram, 1-base A, 2-base B, 3-horizontal rail, 4-lifting rail A, 5-lifting rail B, 6-lifting rail holder A, 7-lifting rail holder B, 8-needle A, 9-needle B, 10-capillary A, 11-capillary B, 12-syringe, 13-microinfusion pump, 14-ultraviolet lamp A, 15-ultraviolet lamp B, 16-ultraviolet lamp power supply, 17-long-range lens, 18-high-speed camera, 19-computer, 20-infrared imager. Detailed Implementation

[0036] As cited in the background art, in existing experimental platforms for studying thermocapillary phenomena between droplets, the solid walls severely affect droplet behavior, and it is difficult to study the influence of the temperature difference between the droplet and the surrounding gas phase. Therefore, this invention provides a visualization experimental system for studying droplet thermocapillary phenomena, comprising: a droplet control device, a heating device, and a data acquisition device. The droplet control device is used to generate two suspended droplets and control at least one of the suspended droplets to approach and collide with the other suspended droplet in a horizontal direction. The two suspended droplets contain fluorescein and tracer particles. The heating device is used to radiate ultraviolet light onto the two suspended droplets and control the temperature of the two suspended droplets. The data acquisition device is used to acquire video and real-time images of at least one of the suspended droplets approaching and colliding with the other suspended droplet in a horizontal direction. This application presents a visualization experimental system for studying droplet thermocapillary phenomena. This system can visualize thermocapillary convection between droplets and observe droplet coalescence, that is, observe the internal flow and deformation of droplets when they approach and come into contact. In this way, it can obtain results such as droplet trajectory and circulation velocity, providing effective data support for studying the mechanism of droplet-droplet coalescence / non-coalescence and droplet-wall interaction.

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Specific embodiment 1 of the visualization experimental system for studying droplet thermocapillary phenomena of the present invention:

[0040] In this embodiment, as Figure 1As shown, this invention provides a visualization experimental system for studying droplet thermocapillary phenomena, including a droplet control device, a heating device, and a data acquisition device. The droplet control device generates two suspended droplets and controls at least one of the suspended droplets to approach and collide with the other droplet in a horizontal direction. The two suspended droplets contain fluorescein and tracer particles. The heating device radiates ultraviolet light onto the two suspended droplets and controls their temperature. The data acquisition device acquires video and real-time images of at least one of the suspended droplets approaching and colliding with the other droplet in a horizontal direction. Specifically, as shown... Figure 4 As shown, when the collection device collects data, the two suspended droplets have the same height and volume, and the two suspended droplets move relative to each other and collide simultaneously in the horizontal direction. The collection device is a high-speed camera 18, which is placed in front of the droplet control device. A long-range lens 17 is provided at the end of the high-speed camera 18 near the droplet, and the center of the lens of the high-speed camera 18 is at the same height as the center of the two suspended droplets.

[0041] In this embodiment, the heating device includes an ultraviolet light source and a connected ultraviolet light power supply. The radiant heat of the ultraviolet light is adjustable. The ultraviolet light is generated by an ultraviolet lamp, and the radiant heat can be controlled by changing the light intensity (0-100%), thereby controlling the droplet temperature. Specifically, the heating device includes two ultraviolet lamps, namely ultraviolet lamp A14 and ultraviolet lamp B15, which are connected to the ultraviolet light source. Ultraviolet lamps A14 and B15 are symmetrically placed at a 45° angle above and to the sides of the two suspended droplets, irradiating them to excite fluorophores.

[0042] In other embodiments, when the collection device collects data, one of the two hovering droplets approaches the other hovering droplet in a horizontal direction and collides with it.

[0043] In other embodiments, when the collection device collects data, the height and volume of the two suspended droplets can be different, as long as the two suspended droplets can collide along the horizontal direction.

[0044] Specific embodiment 2 of the visualization experimental system for studying droplet thermocapillary phenomena of the present invention:

[0045] Based on the above-described technical concept of the present invention, or based on the specific embodiments of the present invention described above, another embodiment is provided below.

[0046] In this embodiment, as Figure 2 and Figure 3As shown, the droplet control device includes a droplet hovering device and a driving device. The droplet hovering device generates two hovering droplets. The driving device, connected to the droplet hovering device, controls at least one of the two hovering droplets to approach the other hovering droplet horizontally and collide with it. The driving device includes a lifting mechanism and a horizontal moving mechanism. The two hovering droplets are mounted on the lifting mechanism to control their height. The horizontal moving mechanism controls at least one of the two hovering droplets to approach the other hovering droplet horizontally and collide with it. The lifting mechanism includes a lifting track along which the two hovering droplets move up and down. The horizontal moving mechanism includes a horizontal track 3 along which the lifting track is mounted and moves horizontally, thereby driving the two hovering droplets horizontally. The edges of the lifting track and the horizontal track 3 are engraved with scales for easy observation of the vertical and horizontal movement distances.

[0047] Specifically, the lifting mechanism includes two opposing lifting tracks, namely lifting track A4 and lifting track B5; simultaneously, lifting track brackets A6 and B7 are provided on lifting track A4 and lifting track B5, and two suspended droplets are placed on lifting track brackets A6 and lifting track brackets B7. In use, the two suspended droplets move up and down along lifting track A4 and lifting track B5 via lifting track brackets A6 and lifting track brackets B7, and their height is fixed by lifting track brackets A6 and lifting track brackets B7. Bases A1 and B2 are horizontally arranged below lifting track A4 and lifting track B5, and a horizontal track 3 is arranged below bases A1 and base B2. Lifting track A4 and lifting track B5 are perpendicular to bases A1 and base B2, and lifting track A4 and lifting track B5 move horizontally along the horizontal track 3 via bases A1 and base B2, thereby driving the two suspended droplets to move horizontally.

[0048] Specific embodiment 3 of the visualization experimental system for studying droplet thermocapillary phenomena of the present invention:

[0049] Based on the above-described technical concept of the present invention, or based on the specific embodiments of the present invention described above, another embodiment is provided below.

[0050] In this embodiment, as Figure 1 and Figure 2As shown, the droplet suspension device includes an injection structure, a capillary, and a needle. The injection structure and the needle are connected to the two ends of the capillary, and the needle is mounted on a drive device. A liquid containing fluorescein and tracer particles is injected into the injection structure. The liquid containing fluorescein and tracer particles passes through the capillary and generates a suspended droplet at the needle. Specifically, the droplet suspension device for generating two suspended droplets includes two injection structures, two capillary tubes, and two needles, namely capillary tubes A10 and B11, and needles A8 and B9. The injection structure includes a micro-injection pump 13 and a syringe 12, where the syringe 12 is a needle tube. In use, needles A8 and B9 are connected to the needle tube via capillary tubes A10 and B11, respectively, and are mounted on lifting rail brackets A6 and B7. By setting the liquid output of the micro-injection pump 13, droplets of different sizes are prepared and suspended on needles A8 and B9.

[0051] The visualization experimental system also includes a data processing device connected to the acquisition device. This device is used to observe and process video and real-time images of at least one of the two hovering droplets approaching and colliding with the other droplet horizontally. Specifically, the data processing device is a computer 19, which is connected to the port of the high-speed camera 18 via a network cable. The computer 19 allows for clear observation of the droplet outline and internal movement; simultaneously, it processes the video and real-time images.

[0052] The visualization experimental system also includes a temperature measuring device, which is connected to the data processing device to monitor the real-time temperature of the two suspended droplets. Specifically, the temperature measuring device is an infrared imager 20, which is located behind the droplet control device. The port of the infrared imager 20 is connected to the computer 19 via a network cable. The center of the lens of the infrared imager 20 is at the same height as the center of the lens of the high-speed camera 18 and the center of the droplet, which facilitates observation of the temperature distribution inside the droplet.

[0053] In other embodiments, the droplet can be suspended using techniques such as ultrasonic levitation or electromagnetic levitation. Those skilled in the art will recognize that different methods can be tailored to specific circumstances.

[0054] The visualization experimental system for studying droplet thermocapillary phenomena provided by this invention has the following specific working process:

[0055] First, use syringe 12 to draw an appropriate amount of liquid that has been stained with fluorescein and has been added with tracer particles. Place syringe 12 on microinjection pump 13 and connect one end of capillary tube, and connect the other end to needle.

[0056] Secondly, by setting the injection speed and time of syringe 12, two droplets of equal volume are generated and suspended. The lifting rails A4 and B5 are adjusted so that the two droplets are at the same height and within the camera recording frame. Then, the droplets are controlled to move closer to each other by moving the bases A1 and B2 horizontally on the horizontal rail 3.

[0057] Then, UV lamps A14 and B15, which are placed at the same height on both sides of the two droplets, are turned on to excite the fluorophore inside the droplets and heat the droplets. At the same time, a high-speed camera 18 is used to capture the entire process of the two droplets approaching each other. The fluorophore makes the droplets clearly visible on the computer 19, and the circulation of the droplets can be clearly observed through the movement of the tracer particles.

[0058] Finally, images and videos of the entire approach-to-contact process of the two droplets, acquired through post-processing on computer 19, are used to form droplet-droplet coalescence / non-coalescence processes and droplet-wall interaction processes.

[0059] Specific embodiment 1 of the visualization experimental method for studying droplet thermocapillary phenomena of the present invention:

[0060] First, the droplet control device is turned on to generate two hovering droplets, which contain fluorescein and tracer particles; then the heating device is turned on to radiate ultraviolet light onto the two hovering droplets.

[0061] Then, at least one of the two hovering droplets is controlled to approach the other hovering droplet in a horizontal direction and collide with it; at the same time, the acquisition device is activated to acquire video and real-time images of at least one of the two hovering droplets approaching the other hovering droplet in a horizontal direction and colliding with it.

[0062] Specifically, the visual experimental method for studying droplet thermocapillary phenomena according to the present invention includes the following steps:

[0063] First, before starting the experiment, take 10 ml of the test liquid, stain it with 1-2 drops of fluorescein, and add 1-2 g of micron-sized polystyrene tracer particles and stir well.

[0064] Next, the above liquid is drawn using a syringe and fixed to two micro-injection pumps 13 respectively. One end of capillary tube A10 and capillary tube B11 are connected to the syringe, and the other end is connected to needle A8 and needle B9 respectively. Needle A8 and needle B9 are fixed at an angle on lifting rail bracket A6 and lifting rail bracket B7, and lifting rail A4 and lifting rail B5 are fixed on base A1 and base B2. At the same time, base A1 and base B2 are set on horizontal rail 3. The two droplets are adjusted to the appropriate position by lifting rail A4 and lifting rail B5.

[0065] Next, place UV lamps A14 and B15 at a 45° angle above and to the outside of the two droplets, and turn on the UV lamp power supply 16 to set the illumination to 100%.

[0066] Then, turn on the high-speed camera 18 and infrared imager 20 and connect them to the computer 19. Open the observation software in the computer 19 and make the droplet image clear by adjusting the focal length of the long-range lens 17 and the parameters of the high-speed camera 18. Set the continuous shooting mode and manual trigger.

[0067] Next, turn on the micro-injection pump 13 to expel air from the capillary and wipe the needle clean. Set the injection time of the micro-injection pump 13 to 1 second each time and the injection speed to 20 ml / min. The liquid flows out of the needle through the capillary to form droplets. By changing the injection time, droplets of different sizes can be prepared.

[0068] Then, the high-speed camera 18 is triggered to take pictures, and by adjusting the base A1 and base B2 to move on the horizontal track 3, one droplet slowly approaches another stationary droplet horizontally until the two droplets come into contact and stop moving. The computer 19 observes the droplet coalescence / non-coalescence phenomenon. The shooting ends after a certain period of time, and the infrared temperature map of the droplet at key moments is saved during the process.

[0069] Finally, images and videos of the entire approach-to-contact process of the two droplets, acquired through post-processing on computer 19, are used to form droplet-droplet coalescence / non-coalescence processes and droplet-wall interaction processes.

[0070] Here, those skilled in the art will understand that the specific operations of each step in the above-described visualization experimental method for studying droplet thermocapillary phenomena have been referenced above. Figures 1 to 4 The description of the visualization experimental system for studying droplet thermocapillary phenomena is detailed here, so its repetition will be omitted.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A visualization experimental system for studying droplet thermocapillary phenomena, characterized in that, include: Droplet control device, heating device, and collection device. The droplet control device is used to generate two hovering droplets and control at least one of the two hovering droplets to approach and collide with the other hovering droplet in a horizontal direction. The two hovering droplets contain fluorescein and tracer particles. The heating device is used to radiate ultraviolet light onto two suspended droplets and control the temperature of the two suspended droplets. The acquisition device is used to acquire video and real-time images of at least one of two hovering droplets approaching and colliding with the other hovering droplet in a horizontal direction.

2. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 1, characterized in that, The two hovering droplets have the same height and volume, and the two hovering droplets move relative to each other and collide simultaneously in the horizontal direction.

3. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 1, characterized in that, The droplet control device includes a droplet hovering device and a driving device. The droplet hovering device is used to generate two hovering droplets; The driving device, connected to the droplet hovering device, is used to control at least one of the two hovering droplets to approach and collide with the other hovering droplet in a horizontal direction.

4. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 3, characterized in that, The driving device includes a lifting mechanism and a horizontal moving mechanism. The two suspended droplets are disposed on the lifting mechanism to control the height of the two suspended droplets. The horizontal moving mechanism is used to control at least one of the two suspended droplets to approach the other suspended droplet in the horizontal direction and collide with it.

5. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 4, characterized in that, The lifting mechanism includes a lifting track, along which the two suspended droplets move up and down; the horizontal movement mechanism includes a horizontal track, along which the lifting track is set and moves horizontally, thereby driving the two suspended droplets to move horizontally.

6. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 3, characterized in that, The droplet hovering device includes an injection structure, a capillary tube, and a needle. The injection structure and the needle are respectively connected to the two ends of the capillary tube, and the needle is mounted on a driving device. A liquid containing fluorescein and tracer particles is injected into the injection structure. The liquid containing fluorescein and tracer particles passes through the capillary tube and generates a hovering droplet at the needle.

7. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 1, characterized in that, The heating device includes an ultraviolet light source and an ultraviolet light power source connected thereto, and the radiant heat of the ultraviolet light is adjustable.

8. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 1, characterized in that, The visualization experiment system also includes a data processing device connected to the acquisition device, used to observe and process video and real-time images of at least one of two hovering droplets approaching and colliding with the other hovering droplet in a horizontal direction.

9. The visualization experimental system for studying droplet thermocapillary phenomena according to claim 8, characterized in that, The visualization experimental system also includes a temperature measuring device, which is connected to a data processing device and is used to monitor the real-time temperature of two suspended droplets.

10. A visual experimental method for studying droplet thermocapillary phenomena, characterized in that, The visualization experimental system for studying droplet thermocapillary phenomena according to any one of claims 1-9 includes the following steps: S1, activate the droplet control device to generate two hovering droplets, wherein fluorescein and tracer particles are added to the two hovering droplets; activate the heating device to radiate ultraviolet light onto the two hovering droplets. S2, control at least one of the two hovering droplets to approach the other hovering droplet in the horizontal direction and collide with it; at the same time, turn on the acquisition device to acquire video and real-time images of at least one of the two hovering droplets approaching the other hovering droplet in the horizontal direction and colliding with it.

Images