Radial electric field under the action of filament coating flow visualization observation device

Abstract

This invention provides a visualization observation device for filament-coated film flow under radial electric field, relating to the fields of fluid mechanics, electrohydrodynamics, experimental observation of liquid film flow, and visualization image acquisition. The device includes a support frame, a liquid supply mechanism, a guide, external electrodes, conductive filaments, a fixing device, a liquid collector, and a DC regulated power supply. The liquid supply mechanism delivers the experimental liquid to the guide via a flexible tube, which guides the liquid to the upper end of the conductive filament, causing the liquid to flow downwards along the surface of the filament to form a liquid film, a wavy liquid film, or a droplet structure. The positive terminal of the DC regulated power supply is electrically connected to the external electrode, and the negative terminal is electrically connected to the conductive filament, creating a radial electric field acting on the filament-coated region between the external electrode and the conductive filament. A transparent conductive film or visualization observation window is provided on the external electrode, allowing continuous observation and image acquisition of the liquid film boundary, droplet profile, droplet offset, droplet tipping, and flow state transition processes during the radial electric field loading process. This invention features a stable structure, controllable liquid supply, and easy adjustment of electric field strength and filament position, making it suitable for experimental research on the flow dynamics of filament-coated membranes under radial electric field.

Description

Technical Field

[0001] This invention relates to the fields of fluid mechanics, electrohydrodynamics, experimental observation of liquid film flow, and visualization image acquisition, and particularly to a visualization observation device for the flow of a thin filament coated with a film under the action of a radial electric field. This device is mainly used for experimental observation and image acquisition of the liquid film flow, droplet formation, droplet evolution, liquid film instability, and flow regime transition processes on the surface of a thin filament under an applied radial electric field. Background Technology

[0002] Filament-coated flow refers to the flow phenomenon where liquid flows downwards along the surface of a filament under the combined influence of gravity, surface tension, viscous forces, and inertial forces, forming a liquid film, wavy liquid film, or droplet structure on the outer surface of the filament. This phenomenon is widely found in fields such as fiber coating, liquid transport, mist collection, microfluidics, heat and mass transfer, and chemical processes. Due to the large curvature of the filament surface, liquid flowing on the filament surface is easily affected by Rayleigh-Platto instability, causing the continuous liquid film to become unstable and form periodic droplets or bead-like structures.

[0003] In traditional studies of filament-coated flow, experimental setups primarily focus on observing liquid film flow under conditions without external fields, mainly investigating the effects of factors such as flow rate, liquid viscosity, surface tension, and filament diameter on the flow state. However, in practical engineering and scientific research, an applied electric field can exert an electric force on the liquid interface, thereby altering the liquid film thickness distribution, droplet morphology, droplet spacing, droplet migration velocity, and flow state transition processes. Especially when a voltage is applied between the filament and the external electrode, a radial electric field can be formed around the filament. This radial electric field can directly act on the liquid film and droplet interface on the filament surface, causing the liquid film flow to exhibit dynamic characteristics different from those under conditions without an electric field.

[0004] Currently, existing filament-coated film flow experimental devices typically suffer from the following shortcomings: First, most devices can only achieve observation of filament liquid film flow under ordinary gravity drive, making it difficult to form a stable and adjustable radial electric field around the filament; second, the relative positions between the filament, electrodes, liquid supply mechanism, and observation mechanism are not easy to adjust precisely, affecting the repeatability of experimental results; third, under the action of the radial electric field, the morphology of the liquid film and droplets changes rapidly, making it difficult for ordinary observation methods to clearly capture the liquid film boundary, droplet profile, and flow evolution process; fourth, the liquid supply system, electric field loading system, and support and fixing system are complex to operate, making it difficult to achieve continuous and stable visual observation.

[0005] Therefore, it is necessary to provide a structurally stable, easy-to-operate experimental device that can generate a controllable radial electric field and can study the evolution of liquid films and droplets on the surface of filaments, so as to investigate the instability mechanism and flow regime change law of filament film flow under the action of radial electric field. Summary of the Invention

[0006] The purpose of this invention is to address the problem that existing filament-coated flow experimental devices cannot simultaneously achieve stable liquid supply, radial electric field loading, filament positioning, and visual observation of the liquid film, by providing a visual observation device for filament-coated flow under the action of a radial electric field.

[0007] To address the problems in existing devices, such as unstable radial electric field loading, insufficient positioning accuracy of the filament and external electrode, difficulty in clearly observing the liquid film flow process, and difficulty in coordinating the liquid supply system, electric field system, fixing system, and recovery system, this invention adopts a design that combines a support and fixing structure, a liquid supply structure, a drainage structure, a radial electric field loading and visualization observation structure, and a liquid recovery structure. This enables a stable film flow to form on the filament surface and creates an adjustable radial electric field between the filament and the external electrode, thereby achieving continuous observation of the liquid film flow, droplet formation, droplet motion, droplet deflection, droplet tipping, and flow state transition processes on the filament surface under different radial electric field conditions.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A visualization observation device for the flow of filaments coated under radial electric field includes a support frame, a liquid supply mechanism, a flow guide, a radial electric field loading and visualization observation mechanism, a filament fixing mechanism, a liquid recovery mechanism, and a DC regulated power supply.

[0010] The support frame is used to install and fix the various components of the device and to provide stable support for the filament coating flow experiment. The support frame can be formed by connecting aluminum profiles, insulating plates, or other structural components with a certain strength. The support frame is provided with an adjustable mounting structure for adjusting the relative positions of the liquid supply mechanism, the guide, the external electrode, the conductive filament, and the liquid recovery mechanism, thereby ensuring that the conductive filament is located within the electric field application area and the visualization observation area.

[0011] The liquid supply mechanism is positioned above the conductive filament and includes a support plate, a pressure plate, a syringe, a tubing, a display, numeric keys, and an adjustment knob. The syringe stores the experimental liquid, the support plate and pressure plate push and hold the syringe in place, the tubing delivers the experimental liquid to the drainage device, the numeric keys and adjustment knob set or adjust the flow rate, and the display shows the supply parameters. By controlling the syringe's pushing speed, the experimental liquid can enter the surface of the conductive filament continuously, stably, or quantitatively, and flow downwards along the filament surface under gravity to form a liquid film.

[0012] The guide is positioned between the liquid supply mechanism and the upper end of the conductive filament. The guide is connected to a flexible tube and is used to guide the experimental liquid supplied by the tube to the upper end of the conductive filament or a position close to the upper end of the conductive filament. The guide has mounting holes or fixing holes and can be connected to a support structure via screws to ensure the stability of the guide's position during the experiment and reduce the impact of liquid supply fluctuations on the liquid film flow.

[0013] The radial electric field loading and visualization observation mechanism includes an external electrode, a conductive filament, a transparent conductive film, a positive terminal, a negative terminal, and a DC regulated power supply. The external electrode is positioned outside the conductive filament, which is vertically positioned in the central or near-central region of the external electrode. The positive terminal of the DC regulated power supply is electrically connected to the external electrode, and the negative terminal is electrically connected to the conductive filament, creating a radial electric field between the external electrode and the conductive filament. By adjusting the output voltage of the DC regulated power supply, the radial electric field strength can be changed to study the flow characteristics of the liquid film and droplets on the filament surface under different electric field conditions.

[0014] The external electrode can be a conductive square cavity, a conductive cylinder, a copper tube, or a ring electrode structure. In a preferred embodiment, the external electrode is a copper tube, with the conductive filament located in the central or near-central region of the copper tube. A transparent conductive film or a visual observation window is provided on the sidewall of the copper tube. The transparent conductive film is preferably an ITO conductive film, which can maintain the conductivity continuity of the external electrode region while maintaining the visual observation channel, allowing the experimenter to observe or acquire images of the liquid film flow on the surface of the conductive filament inside the copper tube from the observation window.

[0015] The filament fixing mechanism is used to fix the upper and / or lower ends of the conductive filament, keeping it vertical during the experiment. A position adjustment structure can be provided between the filament fixing mechanism and the support frame to adjust the coaxiality and relative position between the conductive filament and the external electrode, thereby improving the stability of the radial electric field distribution and the repeatability of the experimental results.

[0016] The liquid recovery mechanism is located below the conductive filament and includes a liquid collector, a base, a mounting hole, a wedge-shaped guide device, and an elliptical hole. The elliptical hole is used to insert or position the conductive filament, the mounting hole is used to fix the liquid collector, and the wedge-shaped guide device is used to collect the experimental liquid flowing down the surface of the conductive filament and guide the liquid into the collection area. By setting up the liquid recovery mechanism, the spillage of experimental liquid can be reduced, improving the cleanliness of the experimental environment and the safety during high-voltage electric field experiments.

[0017] Furthermore, an insulating protection structure is provided between the radial electric field loading and visualization observation mechanism and the support frame. The insulating protection structure can be an insulating plate, insulating sleeve, insulating support or insulating connector, used to isolate the live parts from the support structure and avoid leakage or short circuit during the experiment.

[0018] Furthermore, the visualization observation area corresponds to the film-coated area of ​​the conductive filament. Optionally, the image acquisition device can be set outside the transparent conductive film or observation window, and its position can be adjusted horizontally, vertically, or backward by adjusting the support to adapt to experimental needs such as different filament positions, different liquid film flow states, and different shooting ranges.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, this invention integrates filament coating, liquid supply, flow positioning, radial electric field loading, visualization observation, and liquid recovery into the same experimental platform, enabling the liquid film on the filament surface to flow stably under the action of a controllable radial electric field, and enabling continuous, clear, and repeatable visualization observation of the liquid film instability, droplet formation, and flow evolution process.

[0021] Secondly, the present invention can form a stable radial electric field between the conductive filament and the external electrode. By adjusting the output voltage of the DC regulated power supply, the radial electric field strength can be changed, thereby facilitating comparative studies on the thickness of the liquid film on the filament surface, droplet morphology, droplet spacing, wavelength, wave velocity, and flow state transition law under different electric field strengths.

[0022] Third, by setting up a flow guide, a filament fixing mechanism, and a position adjustment structure, the present invention enables the experimental liquid to stably enter the surface of the conductive filament, and makes the positional relationship between the conductive filament, the electrode, and the observation area more stable, thereby improving the repeatability of the experimental process.

[0023] Fourth, by setting a transparent conductive film or observation window, the present invention enables the external electrode structure to have visual observation conditions while satisfying the radial electric field loading, which is convenient for capturing detailed features such as liquid film boundary, droplet profile, droplet offset and droplet tipping.

[0024] Fifth, by setting up an insulating protection structure and a liquid recovery mechanism, this invention improves the safety and cleanliness of the high-voltage electric field experiment process, and reduces the impact of liquid spillage, electric field interference and experimental errors on the observation results. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the liquid supply mechanism of the present invention;

[0027] Figure 3 This is a schematic diagram of the drainage device of the present invention;

[0028] Figure 4 This is a schematic diagram of the external electrode and visualization observation window structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the radial electric field loading mechanism and electrical connection structure of the present invention;

[0030] Figure 6 This is a schematic diagram illustrating the radial electric field action principle of the present invention;

[0031] Figure 7 This is a schematic diagram of the liquid recovery mechanism of the present invention.

[0032] In the figure, the correspondence between the component names and the reference numerals is as follows: 1-Support frame, 2-Liquid supply mechanism, 201-Pattern, 202-Pressure plate, 203-Syringe, 204-Hose, 205-Display, 206-Number keys, 207-Liquid supply adjustment knob, 3-Drainage device, 4-Copper tube, 5-Visual observation window or filament-coated observation area, 501-External electrode, 502-ITO conductive film, 503-Conductive filament, 504-Positive electrode connection, 505-Negative electrode connection, 507-Power adjustment knob, 508-Power adjustment knob, 509-Display screen, 6-Fixing device, 7-Liquid collector, 701-Mounting hole, 702-Mounting hole, 703-Wedge-shaped drainage device, 704-Base, 705-Oval hole, 8-DC regulated power supply, 9-Support frame. Detailed Implementation

[0033] To make the objectives, technical solutions, and beneficial effects of the embodiments of this application clearer, the implementation methods of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of protection of the present invention.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixing," "setting," "installation," etc., 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 an electrical connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] like Figures 1 to 7As shown, the present invention provides a visualization observation device for the flow of filament-coated film under the action of a radial electric field. The device includes a support frame 1, a liquid supply mechanism 2, a flow guide 3, a copper tube 4, a visualization observation window or filament-coated film observation area 5, a fixing device 6, a liquid collector 7, a DC regulated power supply 8, and a support frame 9.

[0036] refer to Figure 1 The support frame 1 is the main support structure of the entire device, used to install the liquid supply mechanism 2, the diverter 3, the copper tube 4, the fixing device 6, and the liquid collector 7. The support frame 1 can be formed by connecting aluminum profiles, insulating plates, or other structural components with sufficient strength. The copper tube 4 is arranged vertically inside the support frame 1, and the conductive filament 503 is arranged along the axial direction of the copper tube 4. The fixing device 6 is used to fix the conductive filament 503 and keep it vertical. The DC regulated power supply 8 is set on the support frame 9 and is connected to the external electrode 501 and the conductive filament 503 respectively through wires.

[0037] refer to Figure 2 The liquid supply mechanism 2, located above the overall device, includes a support plate 201, a pressure plate 202, a syringe 203, a tubing 204, a display 205, a numeric keypad 206, and a liquid supply adjustment knob 207. The support plate 201 and pressure plate 202 are used to push and fix the syringe 203, respectively, while the tubing 204 is used to deliver the experimental liquid from the syringe 203 to the drainage device 3. The numeric keypad 206 and the liquid supply adjustment knob 207 are used to set or adjust the liquid supply flow rate, and the display 205 is used to display the liquid supply parameters. The liquid supply mechanism 2 allows the experimental liquid to enter the upper end of the conductive filament 503 at a stable flow rate, reducing flow fluctuations caused by manual dripping.

[0038] refer to Figure 3 The drain 3 is positioned between the upper end of the flexible tube 204 and the conductive filament 503. The drain 3 has an inlet channel communicating with the flexible tube 204 and an outlet end facing the conductive filament 503. After the experimental liquid enters the drain 3 through the flexible tube 204, it is guided to the surface of the conductive filament 503. The drain 3 is provided with mounting holes or fixing holes, and can be fixed to the support frame 1 or related mounting structure with screws to ensure a stable liquid supply position.

[0039] refer to Figure 4 and Figure 5 The copper tube 4 serves as the main body of the external electrode or the mounting carrier for the external electrode 501, and its sidewall is provided with a visualization observation window or an ITO conductive film 502. A conductive filament 503 is disposed inside the copper tube 4, located in the central or near-central region of the copper tube 4. The external electrode 501 is electrically connected to the positive terminal of the DC regulated power supply 8 through the positive terminal 504, and the conductive filament 503 is electrically connected to the negative terminal of the DC regulated power supply 8 through the negative terminal 505, thereby forming a radial electric field between the external electrode 501 and the conductive filament 503.

[0040] The DC regulated power supply 8 is equipped with a display screen 509 and power adjustment knobs 507 and 508. The display screen 509 is used to display output voltage or current parameters, and the power adjustment knobs 507 and 508 are used to adjust the output of the DC regulated power supply 8. By changing the output voltage of the DC regulated power supply 8, the potential difference between the external electrode 501 and the conductive filament 503 can be changed, thereby adjusting the radial electric field strength.

[0041] In this embodiment, the external electrode 501 is preferably a conductive cylindrical structure, specifically composed of a copper tube 4. Conductive filaments 503 are arranged along the central axis of the copper tube 4, and an ITO conductive film 502 is disposed in the observation area on the sidewall of the copper tube 4. The ITO conductive film 502 has transparent and conductive properties, which facilitates external observation or imaging of the liquid film flow on the surface of the conductive filaments 503 inside the copper tube 4, and also helps maintain the conductive continuity of the external electrode structure.

[0042] refer to Figure 6 The principle of radial electric field action is as follows: When a voltage is applied between the external electrode 501 and the conductive filament 503, a radially distributed electric field is formed between them. The liquid film on the surface of the conductive filament 503 flows axially downward under the action of gravity, while simultaneously being subjected to the electric force generated by the radial electric field. By changing the voltage, liquid flow rate, conductive filament diameter, or liquid properties, the variations in flow characteristics such as liquid film thickness, droplet morphology, droplet spacing, wavelength, wave velocity, droplet deflection, and droplet tipping can be studied.

[0043] refer to Figure 7 The liquid collector 7 is located below the conductive filament 503 and includes mounting holes 701 and 702, a wedge-shaped flow guide 703, a base 704, and an elliptical hole 705. The elliptical hole 705 allows the conductive filament 503 to pass through or positions its lower end. Mounting holes 701 and 702 are used to mount the liquid collector 7 onto the support frame 1 or the fixing device 6. The wedge-shaped flow guide 703 collects the experimental liquid flowing down the surface of the conductive filament 503 and directs it to a collection area or an external collection box. By installing the liquid collector 7, liquid spillage can be reduced, improving the cleanliness and safety of the experimental environment.

[0044] The specific usage of this embodiment is as follows: Before use, first fix the conductive filament 503 on the fixing device 6 to keep the conductive filament 503 in a vertical state; then install the copper tube 4 or the external electrode 501 on the outside of the conductive filament 503, and adjust the relative position between the conductive filament 503 and the external electrode 501 so that the conductive filament 503 is located in the central area of ​​the external electrode 501 or the predetermined electric field action area; then connect the positive terminal of the DC regulated power supply 8 to the external electrode 501, and connect the negative terminal of the DC regulated power supply 8 to the conductive filament 503.

[0045] After completing the above installation, add the experimental liquid to the syringe 203, start the liquid supply mechanism 2, and deliver the experimental liquid through the tubing 204 to the drainer 3, which then guides it to the upper end of the conductive filament 503. Under the action of gravity, the experimental liquid flows downward along the surface of the conductive filament 503, forming a liquid film, wavy liquid film, or droplet structure on the surface of the conductive filament 503.

[0046] During the experiment, the radial electric field strength between the conductive filament 503 and the external electrode 501 can be changed by adjusting the output voltage of the DC regulated power supply 8; the liquid supply flow rate on the surface of the conductive filament 503 can be changed by adjusting the liquid supply mechanism 2. Researchers can observe the liquid film morphology on the surface of the conductive filament 503 through a visualization window or the ITO conductive film 502, or set up an image acquisition device outside the observation window to continuously record the liquid film boundary, droplet profile, and flow evolution process.

[0047] The liquid flows down along the conductive filament 503 and enters the liquid collector 7, then is guided to the collection area or external collection box by the wedge-shaped guide device 703. This prevents the experimental liquid from accumulating or overflowing within the support frame 1 and reduces the impact of the liquid on electrode connections and experimental safety.

[0048] With the above structure, the present invention can form a stable film flow on the surface of the conductive filament 503 and form an adjustable radial electric field between the conductive filament 503 and the external electrode 501. At the same time, with the help of a transparent conductive film or observation window, the liquid film flow, droplet generation, droplet deflection, droplet tipping and flow state transition processes under the action of the radial electric field can be continuously, clearly and repeatably visualized and observed.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, various modifications, equivalent substitutions, or improvements can be made to the above embodiments without departing from the principles and spirit of this application; all such modifications, equivalent substitutions, or improvements should fall within the protection scope of this application.

Claims

1. A visualization observation device for the flow of thin filaments coated with a film under radial electric field, characterized in that: The system includes a support frame (1), a liquid supply mechanism (2), a drainer (3), an external electrode (501), a conductive filament (503), a fixing device (6), a liquid collector (7), and a DC regulated power supply (8). The liquid supply mechanism (2) is located on the upper part of the support frame (1) and is connected to the drainer (3) via a hose (204). The drainer (3) is located above or near the upper end of the conductive filament (503) to guide the experimental liquid to the upper end of the conductive filament (503), allowing the experimental liquid to flow downward along the surface of the conductive filament (503) under gravity and form a liquid film. The external electrode (501) is located on the outside of the conductive filament (503), and the conductive filament (503) is vertically located in the central or near-central region of the external electrode (501). The fixing device (6) is used to fix the liquid. A conductive filament (503) is fixed and kept vertical; the liquid collector (7) is set below the conductive filament (503) to collect the experimental liquid flowing down the surface of the conductive filament (503); the positive terminal of the DC regulated power supply (8) is electrically connected to the external electrode (501) through the positive terminal connection (504), and the negative terminal of the DC regulated power supply (8) is electrically connected to the conductive filament (503) through the negative terminal connection (505), so that a radial electric field is formed between the external electrode (501) and the conductive filament (503) acting on the liquid film on the surface of the conductive filament (503); a transparent conductive film (502) or a visualization observation window (5) corresponding to the film area of ​​the conductive filament (503) is provided on the external electrode (501) to observe or collect the liquid film flow state on the surface of the conductive filament (503) during the radial electric field loading process.

2. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: The support frame (1) is formed by connecting aluminum profiles, insulating plates or structural components. The support frame (1) is provided with an adjustable mounting structure. The adjustable mounting structure is used to adjust the relative positions of the liquid supply mechanism (2), the drainer (3), the external electrode (501), the conductive filament (503) or the liquid collector (7), so that the conductive filament (503) is located in the central area of ​​the external electrode (501) or the predetermined electric field action area.

3. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: The liquid supply mechanism (2) includes a support plate (201), a pressure plate (202), a syringe (203), a tubing (204), a display (205), a numeric keypad (206), and a liquid supply adjustment knob (207). The support plate (201) and the pressure plate (202) are used to push and fix the syringe (203). One end of the tubing (204) is connected to the syringe (203), and the other end is connected to the drain (3). The numeric keypad (206) and the liquid supply adjustment knob (207) are used to set or adjust the flow rate of the syringe (203). The display (205) is used to display the liquid supply parameters or working status of the liquid supply mechanism (2).

4. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: The drainer (3) is provided with an inlet channel communicating with the hose (204) and an outlet end facing the upper end of the conductive filament (503). The drainer (3) is also provided with an installation hole or a fixing hole for fixing the drainer (3) to the support frame (1) or the mounting structure to keep the relative position of the outlet end and the upper end of the conductive filament (503) stable.

5. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: The external electrode (501) is a conductive square cavity, a conductive cylinder, a copper tube (4), or a ring electrode structure. The conductive filament (503) is inserted into the central region or near the central region of the external electrode (501), so that a radial electric field is formed around the conductive filament (503).

6. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 5, characterized in that: The external electrode (501) is made of copper tube (4), and the transparent conductive film (502) is an ITO conductive film and is disposed on the side wall observation area of ​​the copper tube (4). The ITO conductive film is opposite to the coating area of ​​the conductive filament (503) and is used to form a transparent conductive observation window while maintaining the conductivity continuity of the external electrode (501).

7. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: The DC regulated power supply (8) is mounted on the support frame (9). The DC regulated power supply (8) is equipped with a display screen (509) and power adjustment knobs (507, 508). The display screen (509) is used to display the output voltage, current or power supply operating status. The power adjustment knobs (507, 508) are used to adjust the output of the DC regulated power supply (8) to change the potential difference between the external electrode (501) and the conductive filament (503).

8. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: The fixing device (6) is used to clamp or position the upper and / or lower ends of the conductive filament (503). A position adjustment structure is provided between the fixing device (6) and the support frame (1) to adjust the coaxiality and relative position between the conductive filament (503) and the external electrode (501).

9. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: An insulating protection structure is provided between the external electrode (501), conductive filament (503) or electrical connection end and the support frame (1). The insulating protection structure is at least one of an insulating plate, an insulating sleeve, an insulating support or an insulating connector, used to isolate the external electrode (501), conductive filament (503) or electrical connection end from the support frame (1).

10. A visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: The liquid collector (7) includes a base (704), a wedge-shaped flow guide device (703) disposed on the base (704), mounting holes (701, 702) and an elliptical hole (705). The mounting holes (701, 702) are used to install the liquid collector (7) on the support frame (1) or the fixing device (6). The elliptical hole (705) is used for the conductive filament (503) to pass through or for positioning the lower end of the conductive filament (503). The wedge-shaped flow guide device (703) is used to receive the experimental liquid flowing down the surface of the conductive filament (503) and guide the experimental liquid to the collection area.

11. The visualization observation device for the flow of a thin filament coated with a film under radial electric field according to claim 1, characterized in that: An image acquisition device is provided on the outside of the visualization observation window (5) or the transparent conductive film (502). The image acquisition device can be adjusted in the horizontal, vertical or front-back direction by adjusting the bracket, so as to continuously record the liquid film boundary, droplet profile, droplet offset, droplet tipping or flow state transformation process on the surface of the conductive filament (503).

Images