Liquid suction core capillary backflow boiling visualization device and building method

Abstract

The application discloses a kind of liquid-absorbing core capillary backflow boiling visualization device and building method, it is related to heat management experimental technical field, wherein, liquid-absorbing core capillary backflow boiling visualization device, including frame structure, heating module, cooling module, support structure, data acquisition and visualization module.Frame structure has experiment cavity in, experiment cavity is provided with liquid inlet dam, liquid-absorbing core and heat transfer working medium liquid;Heating module includes immersion heater and heating block;Data acquisition and visualization module includes visualization window and multiple temperature acquisition thermocouple.The application is by temperature acquisition thermocouple to collect the temperature variation data of experiment cavity and using external high-speed camera to collect the visualization boiling image of liquid-absorbing core;Different liquid-absorbing core structure heat transfer temperature data can be obtained simultaneously, and visualization image data of liquid-absorbing core under capillary backflow boiling can also be obtained, effectively meet the research demand of capillary liquid-absorbing core performance.

Description

Technical Field

[0001] This invention relates to the field of thermal management experimental technology, and in particular to a capillary reflux boiling visualization device for a wick, as well as a method for constructing such a device. Background Technology

[0002] Phase change heat transfer elements utilize the latent heat of the working fluid to remove heat, representing a promising thermal management method for solving heat dissipation problems in electronic devices. The working principle is as follows: heat flow from the heat source surface is transferred to the evaporation end via heat conduction. The working fluid inside the phase change heat transfer element absorbs latent heat and evaporates. The working fluid vapor rapidly fills the entire cavity, moves to the condensation end, releases latent heat, and condenses into liquid. The condensed liquid, via the wick, diffuses across the entire condensation surface under capillary pressure, and ultimately returns to the evaporation end under gravity and capillary pressure, reintegrating into the liquid circulation. The wick material is typically the same as the shell material, but its geometry or shape varies widely, commonly including porous media (such as sintered copper powder wicks, sintered wire mesh wicks, and foamed metal wicks) and grooves.

[0003] The main characteristics of the wicking core include porosity, wettability, permeability, and capillary pressure. The working chamber of the phase change heat transfer element is in a high vacuum state, and since the outer shell is mostly made of metal, it is difficult to observe the operation and performance of the wicking core inside. Therefore, it is often necessary to conduct visualization studies in the laboratory to describe the overall performance of the wicking core.

[0004] Most existing laboratory experimental setups focus on studying the single characteristics of the wick, without investigating the coupling performance under different characteristics. Furthermore, they are difficult to visualize in a pure saturated vapor environment of the heat transfer medium. Since the actual situation in phase change heat transfer elements should be that the wick undergoes evaporation and boiling heat transfer while absorbing liquid, an experimental setup is needed to visualize and measure the evaporation and boiling heat transfer during capillary wicking of the wick to solve the above problems. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, embodiments of the present invention provide a capillary reflux boiling visualization device for a wick, capable of simulating the actual environment in a phase change heat transfer element, simultaneously realizing the boiling process of the wick under capillary reflux, and enabling direct visualization of the boiling state under different heating powers.

[0006] This invention also provides a method for constructing a capillary reflux boiling visualization device with a liquid suction core.

[0007] According to an embodiment of a first aspect of the present invention, a capillary reflux boiling visualization device with a wick is provided, comprising a frame structure having an experimental chamber, wherein an inlet dam, a wick, and a heat transfer fluid are disposed within the experimental chamber, the inlet dam being disposed at the bottom of the experimental chamber, the heat transfer fluid being located outside the inlet dam, and the wick being located inside the inlet dam, the inlet dam being provided with a plurality of delivery channels to connect the inner and outer sides of the inlet dam, thereby maintaining the wick's capillary action in wicking; and a heating module comprising at least one immersion heater for heating the heat transfer fluid and a heating block for heating the wick, wherein the heating power of the heating block is [not specified]. Adjustable; a cooling module, including a condenser plate, a reflux condenser, and valves, wherein the condenser plate is located at the top of the experimental chamber, and the reflux condenser and valves are located on the condenser plate to remove non-condensable gases and reflux of the internal heat transfer medium liquid after boiling and vaporization in the experimental chamber; a support structure for fixing and supporting the frame structure and the heating module; and a data acquisition and visualization module, including a visualization window and multiple temperature acquisition thermocouples, wherein the visualization window is located on the condenser plate to observe the evaporation and boiling image of the wick under capillary action, and the temperature acquisition thermocouples are located in the experimental chamber to acquire temperature data within the experimental chamber.

[0008] The aforementioned capillary reflux boiling visualization device with a liquid wick has at least the following beneficial effects: By designing an experimental chamber and setting up an inlet dam, a liquid wick, and a heat transfer medium liquid within the chamber, the invention can simulate the actual environment in a phase change heat transfer element. A condenser reflux device and valve are installed on the condensing plate. After heating and boiling the heat transfer medium liquid for a period of time, non-condensable gases inside the experimental chamber are removed, effectively expelling the non-condensable gases from the experimental chamber and ensuring that the environment inside the experimental chamber consists of both liquid and gaseous heat transfer medium. Subsequently, the liquid wick is heated, and the liquid wick evaporates and boils under capillary reflux, which can be observed through a visualization window. Temperature data inside the experimental chamber is collected by a temperature acquisition thermocouple. In addition, the heating temperature of the heating block is adjustable, allowing for direct visualization and observation of the boiling state under different heating powers.

[0009] According to an embodiment of the first aspect of the present invention, the support structure includes a fixed support, a synthetic stone slab, and a plurality of threaded rods. The synthetic stone slab is nested on the fixed support, and the threaded rods sequentially connect the condenser plate, the synthetic stone slab, and the fixed support. The heating module is installed in the fixed support, and the frame structure is installed on the fixed support.

[0010] According to an embodiment of the first aspect of the present invention, the frame structure includes a plurality of side plates connected end to end, the side plates being made of a high-temperature resistant transparent material, each side plate, together with the fixed support and the synthetic stone slab, forming the experimental chamber, the liquid inlet dam being installed on the top of the fixed support, the liquid suction core being disposed between the liquid inlet dam and the fixed support, and sealing gaskets being provided between the outer edge of the upper end face of the liquid suction core and the liquid inlet dam, and between the outer edge of the lower end face of the liquid suction core and the fixed support.

[0011] According to an embodiment of the first aspect of the present invention, two liquid delivery channels are opened on each of the four sides of the liquid inlet dam. The height of the heat transfer working fluid in the experimental chamber is higher than the inlet of the liquid delivery channel of the liquid inlet dam but not higher than the top of the liquid inlet dam, thereby ensuring that the liquid inlet dam maintains the suction core without submerging it under capillary action. With this technical solution, the height of the heat transfer working fluid in the experimental chamber is higher than the delivery port of the liquid inlet dam but not higher than the liquid inlet dam, enabling the suction core to remain unsubmerged and allowing for visualization of the evaporation and boiling of the suction core under capillary reflux through a visualization window.

[0012] According to an embodiment of the first aspect of the present invention, a cooling water flow pipe is arranged inside the condenser plate, and the flow rate of the cooling water in the cooling water flow pipe is adjustable. By adjusting the flow rate of the cooling water in the condenser plate, the steam pressure in the experimental chamber is kept stable. The condenser reflux device and valve include a condenser reflux device and a valve connecting the condenser reflux device to the experimental chamber. This technical solution, by setting a condenser plate at the top of the experimental chamber and arranging a cooling water flow pipe inside the condenser plate, allows for external connection to circulating cooling water. By adjusting the flow rate of the cooling water in the condenser plate, the steam pressure in the experimental chamber is kept stable, thus maintaining a certain steam pressure to simulate the actual working environment inside the phase change heat transfer element.

[0013] According to an embodiment of the first aspect of the present invention, three temperature acquisition thermocouples are provided, which are respectively used to acquire the temperature of the heat transfer working fluid liquid, the steam temperature after the heat transfer working fluid liquid boils and vaporizes, and the surface temperature of the heating block. The data acquisition and visualization module also includes a pressure sensor installed on the condenser plate for recording the steam pressure change data in the experimental chamber.

[0014] According to an embodiment of the first aspect of the present invention, the immersion heater is mounted on the frame structure and placed in the heat transfer fluid to heat the heat transfer fluid. The heating block is mounted on the fixed support, the top of the heating block extends out of the fixed support and contacts the liquid-absorbing core to heat the liquid-absorbing core. The heating block has several heating rods inserted into it, the power of the heating rods is adjustable, and the heating block is wrapped with heat insulation cotton to reduce heat loss.

[0015] According to an embodiment of the first aspect of the present invention, the fixed support has a space in the middle for mounting the heating block, a ceramic pad is mounted on the fixed support, the heating block is fixed on the ceramic pad, and a plurality of springs are provided between the ceramic pad and the fixed support to adjust the up and down movement of the heating block.

[0016] According to an embodiment of the first aspect of the present invention, the heating module further includes a ceramic heating element installed on the visualization window to remove water droplets and mist from the visualization window.

[0017] According to an embodiment of a second aspect of the present invention, a method for constructing a capillary reflux boiling visualization device with a wick is provided, characterized in that, using the capillary reflux boiling visualization device with a wick according to the first aspect of the present invention, the method includes the following steps:

[0018] Install the liquid suction core on the heating block, fix the heating module and frame structure with the support structure, install the liquid inlet dam in the experimental chamber, add heat transfer medium liquid to the experimental chamber, and ensure that the height of the added heat transfer medium liquid is higher than the inlet of the liquid delivery channel of the liquid inlet dam but not higher than the top of the liquid inlet dam.

[0019] Open the reflux condenser and valve; connect the external power supply to the immersion heater and heat the heat transfer medium liquid in the experimental chamber to boiling point for more than ten minutes to remove non-condensable gases in the experimental chamber; close the reflux condenser and valve, connect the cooling water to the condenser plate, observe the pressure sensor, and adjust the cooling water flow rate to maintain stable steam pressure in the experimental chamber.

[0020] Turn off the external power supply of the immersion heater and turn on the external power supply of the heating rod to heat the heating block; collect and record the temperature data of the experimental chamber through temperature acquisition thermocouples. The temperature data of the experimental chamber includes the temperature of the heat transfer liquid, the temperature of the vapor after the heat transfer liquid boils and vaporizes, and the surface temperature of the heating block; take an image of the liquid suction core in a stable state through a high-speed camera at the visualization window position; gradually increase the input power of the heating rod and record the corresponding temperature data of the experimental chamber and the visualization images of the liquid suction core evaporating and boiling during liquid suction.

[0021] After testing and recording are complete, shut off the external power supply and the cooling water system of the condenser plate.

[0022] The above-mentioned method for constructing a capillary reflux boiling visualization device for a liquid wick has at least the following beneficial effects: by constructing a capillary reflux boiling visualization device for a liquid wick, the actual environment in a phase change heat transfer element can be simulated, and the boiling process of the liquid wick under capillary reflux can be realized, and the boiling state under different heating powers can be directly observed through visualization. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0025] Figure 2 This is a top view of the liquid inlet dam in an embodiment of the present invention;

[0026] Figure 3 This is a side view of the liquid inlet dam in an embodiment of the present invention. Detailed Implementation

[0027] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0029] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0031] Reference Figure 1 A capillary reflux boiling visualization device with a liquid suction core is presented, including a frame structure, a heating module, a cooling module, a support structure, and a data acquisition and visualization module.

[0032] The frame structure includes an experimental cavity 12, which is combined with... Figure 2 and Figure 3The experimental chamber 12 is equipped with an inlet dam 14, a liquid suction core 15, and a heat transfer working fluid 13. In this embodiment, the liquid suction core can be formed from different materials and processes, and the heat transfer working fluid 13 is deionized water or other working fluids. The inlet dam 14 is located at the bottom of the experimental chamber 12, the heat transfer working fluid 13 is located outside the inlet dam 14, and the liquid suction core 15 is located inside the inlet dam 14. The inlet dam 14 is provided with several liquid delivery channels 17 to connect the inner and outer sides of the inlet dam 14, thereby maintaining the liquid suction core 15 under capillary action. (Refer to...) Figure 2 and Figure 3 Two liquid delivery channels 17 are opened on each of the four sides of the liquid inlet dam 14. The height of the heat transfer working fluid liquid 13 in the experimental chamber 12 is higher than the inlet of the liquid delivery channel 17 of the liquid inlet dam 14 but not higher than the top of the liquid inlet dam 14, so that the liquid inlet dam 14 can maintain the liquid suction core 15 under capillary action without being submerged.

[0033] The heating module is used to heat the heat transfer medium liquid 13 and the wicking core 15. The heating module includes at least one immersion heater 31 for heating the heat transfer medium liquid 13 and a heating block 32 for heating the wicking core 15.

[0034] The support structure provides fixed support for the frame structure and heating module, thereby stabilizing the overall device. Specifically, the support structure includes a fixed support 23, a synthetic stone slab 22, and multiple threaded rods 21. The synthetic stone slab 22 is nested on the fixed support 23. The threaded rods 21 sequentially connect the condenser plate 41, the synthetic stone slab 22, and the fixed support 23. This connection is detachable. Taking the condenser plate 41 as an example, the threaded rods 21 are screwed onto nuts located on the upper and lower end faces of the condenser plate 41 for fixed connection. The synthetic stone slab 22 and the fixed support 23 are both made of high-temperature resistant material.

[0035] Among them, such as Figure 1 As shown, the heating module is installed in the fixed support 23. The fixed support 23 has a space in the middle for the heating block 32. It can be understood that the fixed support 23 includes a fixed base and a heating module cover connected together. The heating block 32 is installed between the fixed base and the heating module cover. The fixed base is connected to the threaded rod 21. In addition, a ceramic pad 24 is installed on the fixed support 23. The heating block 32 is fixed on the ceramic pad 24. The ceramic pad 24 can block the heat of the heating block and reduce heat loss. Multiple springs 25 are provided between the ceramic pad 24 and the fixed support 23. The springs 25 can adjust the up and down movement of the heating block 32.

[0036] The frame structure is installed on the fixed support 23. The frame structure includes multiple side plates 11 connected end to end. The side plates 11 are made of high-temperature resistant transparent material, specifically polycarbonate plates. Each side plate 11, together with the fixed support 23 and the synthetic stone plate 22, forms the experimental chamber 12. The experimental chamber 12 is kept airtight by compression force, and sealing rubber gaskets can be added at appropriate sealing locations. The liquid inlet dam 14 is installed on the top of the fixed support 23. The liquid inlet dam 14 is fixed to the fixed support 23 by screws. The liquid suction core 15 is located between the liquid inlet dam 14 and the fixed support 23. Sealing gaskets 16 are provided between the outer edge of the upper end face of the liquid suction core 15 and the liquid inlet dam 14, and between the outer edge of the lower end face of the liquid suction core 15 and the fixed support 23. The liquid suction core 15 is specifically welded to the heating block 32.

[0037] An immersion heater 31 is mounted on the frame structure and placed in the heat transfer medium liquid 13 to heat the liquid. A heating block 32 is mounted on a fixed support 23, with its top extending out of the fixed support 23 and contacting the liquid absorber 15 to heat the liquid absorber 15. Several heating rods 33 are inserted into the heating block 32, and the outer periphery of the heating block 32 is wrapped with heat insulation cotton 34 to reduce heat loss. The heating temperature of the heating block 32 is adjustable, specifically, the power of the heating rods 33 is adjustable; the heating temperature of the heating block 32 is adjusted by adjusting the power of the heating rods 33.

[0038] The cooling module includes a condenser plate 41 and a reflux condenser and valve 42. The condenser plate 41 is located at the top of the experimental chamber 12, and the reflux condenser and valve 42 are located on the condenser plate 41 to remove non-condensable gases and the reflux of the internal heat transfer medium liquid 13 after boiling and vaporization in the experimental chamber 12. The immersion heater 31 is used to heat the heat transfer medium liquid in the experimental chamber 12 to continuous boiling, and then reflux the heat transfer medium liquid through the reflux condenser and valve 42 to remove non-condensable gases in the experimental chamber.

[0039] Cooling water flow pipes are arranged inside the condenser plate 41. The cooling water flow pipes are connected to a circulating cooling system and circulate cooling water. The flow rate of the cooling water in the cooling water flow pipes can be adjusted so as to maintain the steam pressure in the experimental chamber 12 by adjusting the flow rate of the cooling water in the condenser plate 41. The condenser reflux device and valve 42 include the condenser reflux device and the valve that connects the condenser reflux device to the experimental chamber 12.

[0040] The data acquisition and visualization module includes a visualization window 53 and multiple temperature acquisition thermocouples 51. The visualization window 53 is mounted on the condenser plate 41 to observe the evaporation and boiling images of the wick 15 under capillary action. A high-speed camera records the visualization images of the evaporation and boiling of the wick 15 in the experimental chamber. Furthermore, the heating module also includes a ceramic heating element 35 mounted on the visualization window 53 to remove water droplets and mist from the visualization window 53.

[0041] Temperature acquisition thermocouples 51 are installed in the experimental chamber 12 to collect temperature data within the chamber. Three temperature acquisition thermocouples 51 are installed, designated as the first, second, and third thermocouples, respectively, to collect the temperature of the heat transfer medium liquid, the steam temperature after the heat transfer medium liquid 13 boils and vaporizes, and the surface temperature of the heating block 32. The data acquisition and visualization module also includes a pressure sensor 52 installed on the condenser plate 41 to record changes in steam pressure within the experimental chamber 12.

[0042] In some preferred embodiments, the visualization window 53 is made of high-temperature resistant quartz glass, the condenser plate 41 is preferably an aluminum water-cooled plate, the synthetic stone plate 22 is preferably polyetheretherketone or synthetic stone material, and the heating block 32 is preferably a copper block.

[0043] It is understandable that by designing the experimental chamber 12 and setting up the liquid inlet dam 14, the liquid wick 15, and the heat transfer working fluid liquid 13 within the experimental chamber 12, the actual environment in the phase change heat transfer element can be simulated. A condenser reflux device and valve 42 are set on the condenser plate 41. After heating and boiling the heat transfer working fluid liquid for a period of time, the non-condensable gas inside the experimental chamber is removed. This effectively removes the non-condensable gas from the experimental chamber 12, ensuring that the environment inside the experimental chamber consists of both liquid and gaseous heat transfer working fluid. Then, the liquid wick 15 is heated. The liquid wick 15 evaporates and boils under capillary reflux, which can be observed through a visualization window. Temperature data inside the experimental chamber is collected by temperature acquisition thermocouples. In addition, the heating temperature of the heating block is adjustable, and the boiling state under different heating powers can be directly observed visually. This invention is used to study a visualization device for capillary reflux boiling of porous liquid-absorbing cores. It uses a condenser reflux device and valves to degas, heat and condense to control the steam pressure and the structural design of the liquid inlet dam to simulate the actual working environment in a phase change device to collect temperature data of the heating block in the experimental chamber. At the same time, it combines a visualization module design to record and visualize the evaporation and boiling of the liquid-absorbing core under capillary reflux.

[0044] This embodiment also presents a method for constructing a capillary reflux boiling visualization device with a wick, which includes the following steps:

[0045] S1, install the liquid suction core 15 on the heating block, fix the heating module and frame structure with the support structure, install the liquid inlet dam 14 in the experimental chamber 12, add heat transfer medium liquid to the experimental chamber 12, and ensure that the height of the added heat transfer medium liquid 13 is higher than the inlet of the liquid inlet channel of the liquid inlet dam 14 but not higher than the top of the liquid inlet dam 14.

[0046] S2, open the condenser reflux valve and valve 42; connect the external power supply of the immersion heater 31 to heat the heat transfer medium liquid 13 in the experimental chamber 12 to boiling state for more than ten minutes to remove non-condensable gases in the experimental chamber 12; close the condenser reflux valve and valve 42, connect the cooling water of the condenser plate 41, observe the reading of the pressure sensor 52, and adjust the cooling water flow rate to maintain the steam pressure in the experimental chamber stable.

[0047] S3, turn off the external power supply of the immersion heater 31, turn on the external power supply of the heating rod 33 to heat the heating block 32; collect and record the temperature data of the experimental chamber 12 through the temperature acquisition thermocouple 51. The temperature data of the experimental chamber 12 includes the temperature of the heat transfer liquid, the temperature of the steam after the heat transfer liquid 13 boils and vaporizes, and the surface temperature of the heating block 32; take an image of the liquid suction core in a stable state through a high-speed camera at the visualization window position; gradually increase the input power of the heating rod, record the temperature data of the corresponding experimental chamber and the visualization images of the liquid suction core evaporating and boiling during liquid suction.

[0048] S4. After testing and recording are completed, turn off the external power supply and the cooling water system of the condenser plate 41.

[0049] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A capillary reflux boiling visualization device with a liquid suction core, characterized in that: include The experimental chamber contains a frame structure, an inlet dam, a liquid absorber, and a heat transfer fluid. The inlet dam is located at the bottom of the experimental chamber, the heat transfer fluid is located outside the inlet dam, and the liquid absorber is located inside the inlet dam. The inlet dam has several delivery channels to connect the inside and outside of the inlet dam, thereby maintaining the liquid absorber's suction under capillary action. A heating module, comprising at least one immersion heater for heating the heat transfer fluid liquid and a heating block for heating the liquid wick, wherein the heating temperature of the heating block is adjustable; The cooling module includes a condenser plate, a condenser reflux device, and valves. The condenser plate is located at the top of the experimental chamber, and the condenser reflux device and valves are located on the condenser plate to remove non-condensable gases and refluxes from the internal heat transfer working fluid liquid after boiling and vaporization in the experimental chamber. A support structure is provided for the fixed support of the frame structure and the heating module. as well as The data acquisition and visualization module includes a visualization window and multiple temperature acquisition thermocouples. The visualization window is set on the condenser plate to observe the evaporation and boiling image of the liquid wick under capillary action. The temperature acquisition thermocouples are set in the experimental chamber to collect temperature data in the experimental chamber. The support structure includes a fixed support, a synthetic stone slab, and multiple threaded rods. The synthetic stone slab is nested on the fixed support, and the threaded rods sequentially connect the condensation plate, the synthetic stone slab, and the fixed support. The heating module is installed in the fixed support, and the frame structure is installed on the fixed support. The frame structure includes multiple side plates connected end to end. The side plates are made of high-temperature resistant transparent material. Each side plate, together with the fixed support and the synthetic stone slab, forms the experimental chamber. The liquid inlet dam is installed on the top of the fixed support. The liquid suction core is disposed between the liquid inlet dam and the fixed support. Sealing gaskets are provided between the outer edge of the upper end face of the liquid suction core and the liquid inlet dam, and between the outer edge of the lower end face of the liquid suction core and the fixed support. Two liquid delivery channels are opened on each of the four sides of the liquid inlet dam. The height of the heat transfer working fluid in the experimental chamber is higher than the inlet of the liquid delivery channel of the liquid inlet dam but not higher than the top of the liquid inlet dam, so that the liquid inlet dam can maintain the liquid absorption of the liquid core under capillary action without being submerged.

2. The capillary reflux boiling visualization device with a liquid suction core according to claim 1, characterized in that: The condenser plate is equipped with a cooling water flow pipe, and the cooling water flow rate in the cooling water flow pipe is adjustable. By adjusting the cooling water flow rate of the condenser plate, the steam pressure in the experimental chamber is kept stable. The condenser reflux device and valve include the condenser reflux device and the valve connecting the condenser reflux device to the experimental chamber.

3. The capillary reflux boiling visualization device with a liquid suction core according to claim 2, characterized in that: Three temperature acquisition thermocouples are set up to acquire the temperature of the heat transfer working fluid liquid, the temperature of the steam after the heat transfer working fluid liquid boils and vaporizes, and the surface temperature of the heating block, respectively. The data acquisition and visualization module also includes a pressure sensor installed on the condenser plate to record the steam pressure change data in the experimental chamber.

4. The capillary reflux boiling visualization device according to claim 3, characterized in that: The immersion heater is installed on the frame structure and placed in the heat transfer fluid to heat the heat transfer fluid. The heating block is installed in the fixed support, and the top of the heating block extends out of the fixed support and contacts the liquid absorption core to heat the liquid absorption core. Several heating rods are inserted into the heating block, and the power of the heating rods is adjustable. The heating block is wrapped with heat insulation cotton to reduce heat loss.

5. The capillary reflux boiling visualization device according to claim 4, characterized in that: The fixed support has a space in the middle for the installation of the heating block. A ceramic pad is installed on the fixed support, and the heating block is fixed on the ceramic pad. Multiple springs are provided between the ceramic pad and the fixed support to adjust the up and down movement of the heating block.

6. The capillary reflux boiling visualization device according to claim 4, characterized in that: The heating module also includes a ceramic heating element installed in the visualization window to remove water droplets and mist from the visualization window.

7. A method for constructing a capillary reflux boiling visualization device with a liquid suction core, characterized in that, Using the capillary reflux boiling visualization device with a suction core according to any one of claims 4 to 6, the following steps are included: Install the liquid suction core on the heating block, fix the heating module and frame structure with the support structure, install the liquid inlet dam in the experimental chamber, add heat transfer medium liquid to the experimental chamber, and ensure that the height of the added heat transfer medium liquid is higher than the inlet of the liquid delivery channel of the liquid inlet dam but not higher than the top of the liquid inlet dam. Open the reflux condenser and valve; connect the external power supply to the immersion heater and heat the heat transfer medium liquid in the experimental chamber to boiling point for more than ten minutes to remove non-condensable gases in the experimental chamber; close the reflux condenser and valve, connect the cooling water to the condenser plate, observe the pressure sensor, and adjust the cooling water flow rate to maintain stable steam pressure in the experimental chamber. Turn off the external power supply of the immersion heater and turn on the external power supply of the heating rod to heat the heating block; collect and record the temperature data of the experimental chamber through temperature acquisition thermocouples. The temperature data of the experimental chamber includes the temperature of the heat transfer liquid, the temperature of the vapor after the heat transfer liquid boils and vaporizes, and the surface temperature of the heating block; take an image of the liquid suction core in a stable state through a high-speed camera at the visualization window position; gradually increase the input power of the heating rod and record the corresponding temperature data of the experimental chamber and the visualization images of the liquid suction core evaporating and boiling during liquid suction. After testing and recording are complete, shut off the external power supply and the cooling water system of the condenser plate.

Images