CN116294742A - Wick capillary reflux boiling visualization device and construction method - Google Patents
Wick capillary reflux boiling visualization device and construction method Download PDFInfo
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- CN116294742A CN116294742A CN202310106982.1A CN202310106982A CN116294742A CN 116294742 A CN116294742 A CN 116294742A CN 202310106982 A CN202310106982 A CN 202310106982A CN 116294742 A CN116294742 A CN 116294742A
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- 238000010992 reflux Methods 0.000 title claims abstract description 62
- 238000009835 boiling Methods 0.000 title claims abstract description 50
- 238000012800 visualization Methods 0.000 title claims abstract description 49
- 238000010276 construction Methods 0.000 title abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 181
- 238000010438 heat treatment Methods 0.000 claims abstract description 107
- 238000002474 experimental method Methods 0.000 claims abstract description 70
- 238000012546 transfer Methods 0.000 claims abstract description 61
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Chemical Kinetics & Catalysis (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a wick capillary reflux boiling visualization device and a construction method, and relates to the technical field of thermal management experiments. The frame structure is internally provided with an experiment cavity, and a liquid inlet dam, a liquid suction core and heat transfer working medium liquid are arranged in the experiment cavity; the heating module comprises an immersion heater and a heating block; the data acquisition and visualization module comprises a visualization window and a plurality of temperature acquisition thermocouples. According to the invention, temperature change data of an experiment cavity are acquired through a temperature acquisition thermocouple, and an external high-speed camera is adopted to acquire a visualized boiling image of the liquid suction core; the method can obtain the heat transmission temperature data of different wick structures, and simultaneously can obtain the visual image data of the wick boiling under capillary reflux, thereby effectively meeting the research requirements of the capillary wick performance.
Description
Technical Field
The invention relates to the technical field of thermal management experiments, in particular to a wick capillary reflux boiling visualization device and a construction method of the wick capillary reflux boiling visualization device.
Background
The phase change heat transfer element takes heat away by utilizing the phase change latent heat of the working medium, and is the most potential heat management mode for solving the heat dissipation problem of electronic equipment. The working principle is as follows: the heat flow on the surface of the heat source is transferred to the evaporation end through heat conduction, the working medium in the phase change heat transfer element absorbs latent heat and evaporates, the working medium vapor quickly fills the whole cavity and moves to the condensation end to release the latent heat, the condensed liquid is condensed into liquid, the condensed liquid is diffused to the whole condensation surface through the liquid suction core under the action of capillary pressure, and finally returns to the evaporation end through the action of gravity and capillary pressure, and the liquid is added again for circulation. The material of the liquid absorbing core is usually the same as that of the shell material, but the material has various geometric shapes or forms, and porous media (such as copper powder sintered liquid absorbing cores, silk screen sintered liquid absorbing cores, foam metal liquid absorbing cores) and grooves are common.
The main characteristics of the wick include porosity, wettability, permeability, capillary pressure, the working chamber in the phase change heat transfer element is in a highly evacuated state, and because the shell is mostly metallic, the operation and performance of the wick inside is difficult to observe, and visual investigation in the laboratory is often required to describe the overall performance of the wick.
The experimental device in the existing laboratory is mainly used for researching single characteristics of the liquid suction core, coupling performance under different characteristics is not researched, and visual test is difficult to be carried out under the pure saturated steam environment of a heat transfer working medium.
Disclosure of Invention
The present invention aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the embodiment of the invention provides a wick capillary reflux boiling visualization device which can simulate the actual environment in a phase change heat transfer element, can realize the boiling process of a wick under capillary reflux, and can directly observe the boiling state under different heating powers in a visualized manner.
The embodiment of the invention also provides a method for constructing the wick capillary reflux boiling visualization device.
According to an embodiment of the first aspect of the present invention, there is provided a wick capillary reflux boiling visualization device, including a frame structure, wherein an experiment cavity is provided in the frame structure, a liquid inlet dam, a wick and a heat transfer working medium liquid are provided in the experiment cavity, the liquid inlet dam is provided at the bottom of the experiment cavity, the heat transfer working medium liquid is located at the outer side of the liquid inlet dam, the wick is located at the inner side of the liquid inlet dam, and the liquid inlet dam is provided with a plurality of infusion channels to communicate the inner side and the outer side of the liquid inlet dam, so as to maintain the wick to perform liquid suction under capillary action; the heating module comprises at least one immersion heater for heating the heat transfer working medium liquid and a heating block for heating the liquid suction core, and the heating power of the heating block is adjustable; the cooling module comprises a condensing plate, a condensing reflux device and a valve, wherein the condensing plate is arranged at the top of the experimental cavity, and the condensing reflux device and the valve are arranged on the condensing plate and are used for removing reflux of non-condensable gas and internal heat transfer working medium liquid in the experimental cavity after boiling gasification; a support structure for fixed support of the frame structure and the heating module; and the data acquisition and visualization module comprises a visualization window and a plurality of temperature acquisition thermocouples, wherein the visualization window is arranged on the condensation plate and used for observing an evaporation boiling image of the liquid suction core under capillary action, and the temperature acquisition thermocouples are arranged in the experiment cavity and used for acquiring temperature data in the experiment cavity.
The wick capillary reflux boiling visualization device has at least the following beneficial effects: according to the invention, by designing the experiment cavity and arranging the liquid inlet dam, the liquid suction core and the heat transfer working medium liquid in the experiment cavity, the actual environment in the phase change heat transfer element can be simulated, the condensing reflux device and the valve are arranged on the condensing plate, the non-condensable gas in the experiment cavity is removed after the heat transfer working medium liquid is heated and boiled for a period of time, the non-condensable gas in the experiment cavity can be effectively discharged, and the environment in the experiment cavity is ensured to be composed of the heat transfer working medium liquid and the gas; and then the liquid suction core is heated, evaporation and boiling of the liquid suction core occur under capillary reflux, the liquid suction core can be observed through a visual window, temperature data in the experimental cavity can be collected through a temperature acquisition thermocouple, in addition, the heating temperature of the heating block can be adjusted, and the boiling state under different heating powers can be visually and directly observed.
According to an embodiment of the first aspect of the present invention, the support structure comprises a fixed support, a synthetic stone plate and a plurality of threaded rods, the synthetic stone plate is nested on the fixed support, the threaded rods connect the condensing plate, the synthetic stone plate and the fixed support in sequence, the heating module is installed in the fixed support, and the frame structure is installed in the fixed support.
According to the embodiment of the first aspect of the invention, the frame structure comprises a plurality of side plates which are sequentially connected end to end, the side plates are made of high-temperature-resistant transparent materials, the side plates, the fixed support and the synthetic stone plates jointly enclose the experiment cavity, the liquid inlet dam is arranged at the top of the fixed support, the liquid suction core is arranged between the liquid inlet dam and the fixed support, and sealing gaskets are respectively arranged between the upper end surface outer edge of the liquid suction core and the liquid inlet dam and between the lower end surface outer edge of the liquid suction core and the fixed support.
According to the embodiment of the first aspect of the invention, two infusion channels are respectively arranged on the four sides of the liquid inlet dam, and the height of the heat transfer working medium liquid in the experiment cavity is higher than the inlet of the infusion 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 suction core to be not submerged under the capillary action. According to the technical scheme, the height of the heat transfer working medium liquid in the experiment cavity is higher than the liquid inlet of the liquid inlet dam but not higher than the liquid inlet dam, the liquid suction core can be prevented from being submerged through the liquid inlet dam, and a visual image that the liquid suction core evaporates and boils under capillary reflux is observed through the visual window.
According to an embodiment of the first aspect of the present invention, a cooling water flow pipeline is arranged in the condensation plate, and the cooling water flow rate in the cooling water flow pipeline is adjustable, so that the cooling water flow rate of the condensation plate is adjusted, and therefore the steam pressure in the experiment cavity is kept stable, and the condensation reflux device and the valve comprise a condensation reflux device and a valve for communicating the condensation reflux device with the experiment cavity. Through this technical scheme, set up the condensate plate at experimental chamber top, arranged the cooling water flow pipeline in the condensate plate, but external circulation cooling water, the steam pressure in the experimental chamber is stable through adjusting the cooling water velocity of flow of condensate plate, can keep certain steam pressure in order to simulate the inside actual operational environment of phase change heat transfer element.
According to an embodiment of the first aspect of the present invention, three temperature collection thermocouples are respectively configured to collect the temperature of the heat transfer working medium liquid, the steam temperature after boiling and gasification of the heat transfer working medium liquid, and the surface temperature of the heating block, and the data collection and visualization module further includes a pressure sensor installed on the condensation plate, and is configured to record steam pressure change data in the experimental cavity.
According to an embodiment of the first aspect of the present invention, the immersion heater is mounted on the frame structure and is placed in the heat transfer working medium liquid to heat the heat transfer working medium liquid, the heating block is mounted on the fixing support, the top of the heating block extends out of the fixing support and contacts with the liquid suction core to heat the liquid suction core, the heating block is inserted with a plurality of heating rods, the power of the heating rods is adjustable, and the periphery of the heating block is wrapped with heat insulation cotton to reduce heat loss of the heating block.
According to the embodiment of the first aspect of the invention, the middle part of the fixed support is provided with an installation space for the heating block, the fixed support is provided with a ceramic cushion block, the heating block is fixed on the ceramic cushion block, and a plurality of springs are arranged between the ceramic cushion block and the fixed support so as to adjust the up-and-down movement of the heating block.
According to an embodiment of the first aspect of the present invention, the heating module further comprises a ceramic heating plate mounted on the visualization window to remove water droplets and mist on the visualization window.
According to an embodiment of the second aspect of the present invention, there is provided a method for constructing a wick capillary reflux boiling visualization device, characterized in that the wick capillary reflux boiling visualization device according to the embodiment of the first aspect of the present invention is used, comprising the steps of:
the liquid suction core is arranged on the heating block, the heating module and the frame structure are fixedly supported through the supporting structure, the liquid inlet dam is arranged in the experiment cavity, heat transfer working medium liquid is added into the experiment cavity, and the added heat transfer working medium liquid is ensured to be higher than the inlet of the infusion channel of the liquid inlet dam but not higher than the top of the liquid inlet dam;
opening a condensation reflux device and a valve; switching on an external power supply of the immersion heater, heating the heat transfer working medium liquid in the experiment cavity to a boiling state for more than ten minutes to remove non-condensable gas in the experiment cavity; closing the condensation reflux device and the valve, switching on cooling water of the condensation plate, observing the pressure sensor, and adjusting the flow rate of the cooling water to keep the pressure of steam in the experiment cavity stable;
closing an external power supply of the immersion heater, and switching on the external power supply of the heating rod to heat the heating block; acquiring and recording temperature data of an experiment cavity through a temperature acquisition thermocouple, wherein the temperature data of the experiment cavity comprises the temperature of heat transfer working medium liquid, the steam temperature after the heat transfer working medium liquid boils and gasifies and the surface temperature of a heating block; shooting an image in a stable state of the liquid suction core at the position of the visual window through a high-speed camera; gradually increasing the input power of the heating rod, and recording temperature data of a corresponding experiment cavity and visual images of evaporation and boiling of the liquid suction core during liquid suction;
and after the test and the recording are finished, the external power supply and the cooling water system of the condensing plate are closed.
The method for constructing the wick capillary reflux boiling visualization device has at least the following beneficial effects: by constructing the wick capillary reflux boiling visualization device, the actual environment in the phase change heat transfer element can be simulated, the boiling process of the wick under capillary reflux can be realized, and the visualization can be carried out to directly observe the boiling state under different heating powers.
Drawings
The invention is further described below with reference to the drawings and examples;
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a top view of a feed dam in an embodiment of the present invention;
fig. 3 is a side view of a feed dam in an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1, a wick capillary reflux boiling visualization device is shown comprising a frame structure, a heating module, a cooling module, a support structure, a data acquisition and visualization module.
Wherein, the frame structure is provided with an experiment cavity 12, and in combination with fig. 2 and 3, the experiment cavity 12 is provided with a liquid inlet dam 14, a liquid suction core 15 and a heat transfer working medium liquid 13. In this embodiment, the wick may be formed from different materials and processes, and the heat transfer fluid 13 may be deionized water or another fluid. The liquid inlet dam 14 is arranged at the bottom of the experiment cavity 12, the heat transfer working medium liquid 13 is positioned at the outer side of the liquid inlet dam 14, the liquid suction core 15 is positioned at the inner side of the liquid inlet dam 14, and the liquid inlet dam 14 is provided with a plurality of liquid conveying channels 17 so as to be communicated with the inner side and the outer side of the liquid inlet dam 14, so that the liquid suction core 15 is maintained to suck liquid under the capillary action. Referring to fig. 2 and 3, two infusion channels 17 are respectively formed on four sides of the liquid inlet dam 14, and the heat transfer working medium liquid 13 in the experiment cavity 12 is higher than the inlet of the infusion 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 to absorb liquid under the capillary action and is not submerged.
The heating module is used for heating the heat transfer medium liquid 13 and the wick 15, and comprises at least one immersion heater 31 for heating the heat transfer medium liquid 13 and a heating block 32 for heating the wick 15.
The support structure is used for the fixed support of the frame structure and the heating module, so that the whole device is stable. Specifically, the support structure includes a fixing support 23, a synthetic stone plate 22 and a plurality of threaded rods 21, the synthetic stone plate 22 is nested on the fixing support 23, the threaded rods 21 connect the condensation plate 41, the synthetic stone plate 22 and the fixing support 23 in sequence, the connection mode is to be detachable connection, and the condensation plate 41 is taken as an example, specifically, nuts located on the upper end face and the lower end face of the condensation plate 41 are screwed on the threaded rods 21, so that the fixing connection is performed. The synthetic stone plate 22 is made of a high temperature resistant material, and the fixing support 23 is made of a high temperature resistant material.
Wherein, as shown in fig. 1, the heating module is installed in the fixing support 23, the middle of the fixing support 23 has an installation space for the heating block 32, it is understood that the fixing support 23 includes a fixing base and a heating module cover body connected, the heating block 32 is installed between the fixing base and the heating module cover body, and the fixing base is connected with the threaded rod 21. In addition, the ceramic cushion block 24 is installed to the fixed support 23, and the heating block 32 is fixed on ceramic cushion block 24, and ceramic cushion block 24 can separate the heat of heating block, reduces the loss of heat, is provided with a plurality of springs 25 between ceramic cushion block 24 and the fixed support 23, and the up-and-down movement of heating block 32 can be adjusted to spring 25.
The frame structure is mounted on a fixed support 23. The frame construction includes a plurality of curb plates 11 that end to end links to each other in proper order, and curb plate 11 adopts high temperature resistant transparent material, and curb plate 11 is the polycarbonate board specifically, and each curb plate 11 encloses into experiment chamber 12 jointly with fixed bolster 23, synthetic slabstone 22, relies on the packing force to keep experiment chamber 12's leakproofness to can suitably seal in the position that needs the seal with sealing rubber pad. The liquid inlet dam 14 is installed at the top of the fixed support 23, the liquid inlet dam 14 is fixed on the fixed support 23 through screws, the liquid suction core 15 is arranged between the liquid inlet dam 14 and the fixed support 23, and sealing gaskets 16 are arranged 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. Wherein the wick 15 is specifically welded to the heating block 32.
The immersion heater 31 is installed on the frame structure and is placed in the heat transfer working medium liquid 13 to heat the heat transfer working medium liquid 13, the heating block 32 is installed on the fixed support 23, the top of the heating block 32 extends out of the fixed support 23 and is in contact with the liquid suction core 15 to heat the liquid suction core 15, the heating block 32 is inserted with a plurality of heating rods 33, and the periphery of the heating block 32 is wrapped with heat insulation cotton 34 to reduce heat loss of the heating block 32. The heating temperature of the heating block 32, specifically, the power of the heating rod 33 is adjustable, and the heating temperature of the heating block 32 is adjusted by adjusting the power of the heating rod 33.
The cooling module comprises a condensing plate 41 and a condensing reflux device and a valve 42, wherein the condensing plate 41 is arranged at the top of the experiment cavity 12, and the condensing reflux device and the valve 42 are arranged on the condensing plate 41 and are used for removing non-condensable gas in the experiment cavity 12 and reflux of the internal heat transfer working medium liquid 13 after boiling gasification. Immersion heater 31 is used to heat the heat transfer fluid in chamber 12 to boil and then back flow the heat transfer fluid through condensate reflux and valve 42 to remove non-condensable gases from the chamber.
The cooling water flow pipeline is arranged in the condensing plate 41, the cooling water flow pipeline is externally connected with a circulating cooling system, circulating cooling water is introduced, and the flow speed of the cooling water in the cooling water flow pipeline is adjustable, so that the stability of the steam pressure in the experimental cavity 12 is kept by adjusting the flow speed of the cooling water in the condensing plate 41, and the condensing reflux device and the valve 42 comprise a condensing reflux device and a valve for communicating the condensing reflux device with the experimental cavity 12.
The data acquisition and visualization module comprises a visualization window 53 and a plurality of temperature acquisition thermocouples 51, wherein the visualization window 53 is arranged on the condensation plate 41 and is used for observing an evaporation boiling image of the liquid suction core 15 under the capillary action, and a high-speed camera is used for recording the visualization image of evaporation and boiling of the liquid suction core 15 in the experiment cavity. Further, the heating module further includes a ceramic heating plate 35 mounted on the visualization window 53 to remove water droplets and mist on the visualization window 53.
A temperature acquisition thermocouple 51 is provided in the experiment chamber 12 for acquiring temperature data within the experiment chamber 12. The three temperature acquisition thermocouples 51 are arranged, the three temperature acquisition thermocouples 51 are a first thermocouple, a second thermocouple and a third thermocouple in sequence and are respectively used for acquiring the temperature of the heat transfer working medium liquid, the steam temperature after the heat transfer working medium liquid 13 boils and gasifies and the surface temperature of the heating block 32, and the data acquisition and visualization module further comprises a pressure sensor 52 arranged on the condensing plate 41 and used for recording the steam pressure change data in the experiment cavity 12.
In some preferred embodiments, visualization window 53 is made of high temperature resistant quartz glass, condensing plate 41 may preferably be an aluminum water cooled plate, synthetic stone plate 22 may preferably be a polyetheretherketone or a synthetic stone material, and heating block 32 may preferably be a copper block.
It can be understood that by designing the experiment cavity 12 and arranging the liquid inlet dam 14, the liquid suction core 15 and the heat transfer working medium liquid 13 in the experiment cavity 12, the actual environment in the phase change heat transfer element can be simulated, the condensing reflux device and the valve 42 are arranged on the condensing plate 41, the non-condensable gas in the experiment cavity is removed after the heat transfer working medium liquid is heated and boiled for a period of time, the non-condensable gas in the experiment cavity 12 can be effectively discharged, the environment in the experiment cavity is ensured to be composed of the heat transfer working medium liquid and the gas, the liquid suction core 15 is heated after the heat transfer working medium liquid and the gas is heated, the liquid suction core 15 is evaporated and boiled under capillary reflux, the temperature data in the experiment cavity can be collected through the visual window, in addition, the heating temperature of the heating block can be adjusted, and the heating state under different heating powers can be visually and directly observed. The invention is used for researching a porous wick capillary reflux boiling visualization device, adopts a condensation reflux device and a valve to degas, heat and condense, controls steam pressure and simulates the actual working environment in a phase change device by structural design of a liquid inlet dam to collect temperature data of a heating block of an experiment cavity, and simultaneously combines with a visualization module design to realize recording of a visualized image of evaporation and boiling of a wick under capillary reflux.
The embodiment also shows a method for constructing the wick capillary reflux boiling visualization device, which comprises the following steps:
s1, installing a liquid suction core 15 on a heating block, fixedly supporting the heating module and a frame structure through a supporting structure, installing a liquid inlet dam 14 in an experiment cavity 12, adding heat transfer working medium liquid into the experiment cavity 12, and ensuring that the added heat transfer working medium liquid 13 is higher than the inlet of an infusion channel of the liquid inlet dam 14 but not higher than the top of the liquid inlet dam 14.
S2, opening a condensation reflux device and a valve 42; switching on an external power supply of the immersion heater 31, and heating the heat transfer working medium liquid 13 in the experiment cavity 12 to a boiling state for more than ten minutes to remove non-condensable gas in the experiment cavity 12; the condensing reflux and valve 42 is closed, the cooling water of the condensing plate 41 is turned on, the indication of the pressure sensor 52 is observed, and the flow rate of the cooling water is regulated to keep the steam pressure in the experiment cavity stable.
S3, turning off an external power supply of the immersion heater 31, and turning on the external power supply of the heating rod 33 to heat the heating block 32; the temperature data of the experiment cavity 12 are collected and recorded through the temperature collection thermocouple 51, and the temperature data of the experiment cavity 12 comprise the temperature of the heat transfer working medium liquid, the steam temperature after the heat transfer working medium liquid 13 boils and gasifies and the surface temperature of the heating block 32; shooting an image in a stable state of the liquid suction core at the position of the visual window through a high-speed camera; the input power of the heating rod is gradually increased, and the temperature data of the corresponding experimental cavity and the visual images of evaporation and boiling of the liquid suction core during liquid suction are recorded.
S4, after the test and the recording are finished, the external power supply and the cooling water system of the condensing plate 41 are turned off.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (10)
1. A wick capillary reflux boiling visualization device, characterized by: comprising
The liquid suction device comprises a frame structure, wherein an experiment cavity is arranged in the frame structure, a liquid inlet dam, a liquid suction core and heat transfer working medium liquid are arranged in the experiment cavity, the liquid inlet dam is arranged at the bottom of the experiment cavity, the heat transfer working medium liquid is positioned at the outer side of the liquid inlet dam, the liquid suction core is positioned at the inner side of the liquid inlet dam, and the liquid inlet dam is provided with a plurality of liquid conveying channels for communicating the inner side and the outer side of the liquid inlet dam, so that the liquid suction core is maintained to suck liquid under the capillary action;
the heating module comprises at least one immersion heater for heating the heat transfer working medium liquid and a heating block for heating the liquid suction core, and the heating temperature of the heating block is adjustable;
the cooling module comprises a condensing plate, a condensing reflux device and a valve, wherein the condensing plate is arranged at the top of the experimental cavity, and the condensing reflux device and the valve are arranged on the condensing plate and are used for removing reflux of non-condensable gas and internal heat transfer working medium liquid in the experimental cavity after boiling gasification;
a support structure for fixed support of the frame structure and the heating module; and
the data acquisition and visualization module comprises a visualization window and a plurality of temperature acquisition thermocouples, wherein the visualization window is arranged on the condensation plate and used for observing an evaporation boiling image of the liquid suction core under the capillary action, and the temperature acquisition thermocouples are arranged in the experiment cavity and used for acquiring temperature data in the experiment cavity.
2. A wick capillary reflux boiling visualization device as recited in claim 1, wherein: the support structure comprises a fixed support, a synthetic stone plate and a plurality of threaded rods, wherein the synthetic stone plate is nested on the fixed support, the threaded rods are sequentially connected with the condensing plate, the synthetic stone plate and the fixed support, the heating module is installed in the fixed support, and the frame structure is installed in the fixed support.
3. A wick capillary reflux boiling visualization device as recited in claim 2, wherein: the frame structure comprises a plurality of side plates which are sequentially connected end to end, the side plates are made of high-temperature-resistant transparent materials, the side plates, the fixed support and the synthetic stone plates jointly enclose an experiment cavity, the liquid inlet dam is arranged at the top of the fixed support, the liquid suction core is arranged between the liquid inlet dam and the fixed support, and sealing gaskets are arranged 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.
4. A wick capillary reflux boiling visualization device as recited in claim 3, wherein: the four sides of the liquid inlet dam are respectively provided with two liquid conveying channels, and the height of the heat transfer working medium liquid in the experiment cavity is higher than the inlet of the liquid conveying 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 suction core to be not submerged under the capillary action.
5. A wick capillary reflux boiling visualization device according to any one of claims 2 to 4, characterized in that: the cooling water flow pipeline is arranged in the condensing plate, the cooling water flow rate in the cooling water flow pipeline is adjustable, so that the steam pressure in the experimental cavity is kept stable by adjusting the cooling water flow rate of the condensing plate, and the condensing reflux device and the valve comprise a condensing reflux device and a valve which is used for communicating the condensing reflux device with the experimental cavity.
6. A wick capillary reflux boiling visualization device as recited in claim 5, wherein: the temperature acquisition thermocouples are used for respectively acquiring the temperature of the heat transfer working medium liquid, the steam temperature after the heat transfer working medium liquid boils and gasifies and the surface temperature of the heating block, and the data acquisition and visualization module further comprises a pressure sensor arranged on the condensing plate and used for recording the steam pressure change data in the experiment cavity.
7. A wick capillary reflux boiling visualization device as recited in claim 6, wherein: the immersion heater is arranged on the frame structure and is arranged in the heat transfer working medium liquid to heat the heat transfer working medium liquid, the heating block is arranged on the fixed support, the top of the heating block extends out of the fixed support and contacts with the liquid suction core to heat the liquid suction core, the heating block is inserted with a plurality of heating rods, the power of the heating rods is adjustable, and the periphery of the heating block is wrapped with heat insulation cotton to reduce the heat loss of the heating block.
8. A wick capillary reflux boiling visualization device as recited in claim 7, wherein: the middle part of the fixed support is provided with an installation space for the heating block, the fixed support is provided with a ceramic cushion block, the heating block is fixed on the ceramic cushion block, and a plurality of springs are arranged between the ceramic cushion block and the fixed support so as to adjust the heating block to move up and down.
9. A wick capillary reflux boiling visualization device as recited in claim 7, wherein: the heating module further comprises a ceramic heating plate arranged on the visual window so as to remove water drops and mist on the visual window.
10. A method of constructing a wick capillary reflux boiling visualization device, characterized by using a wick capillary reflux boiling visualization device as set forth in any one of claims 7 to 9, comprising the steps of:
the liquid suction core is arranged on the heating block, the heating module and the frame structure are fixedly supported through the supporting structure, the liquid inlet dam is arranged in the experiment cavity, heat transfer working medium liquid is added into the experiment cavity, and the added heat transfer working medium liquid is ensured to be higher than the inlet of the infusion channel of the liquid inlet dam but not higher than the top of the liquid inlet dam;
opening a condensation reflux device and a valve; switching on an external power supply of the immersion heater, heating the heat transfer working medium liquid in the experiment cavity to a boiling state for more than ten minutes to remove non-condensable gas in the experiment cavity; closing the condensation reflux device and the valve, switching on cooling water of the condensation plate, observing the pressure sensor, and adjusting the flow rate of the cooling water to keep the pressure of steam in the experiment cavity stable;
closing an external power supply of the immersion heater, and switching on the external power supply of the heating rod to heat the heating block; acquiring and recording temperature data of an experiment cavity through a temperature acquisition thermocouple, wherein the temperature data of the experiment cavity comprises the temperature of heat transfer working medium liquid, the steam temperature after the heat transfer working medium liquid boils and gasifies and the surface temperature of a heating block; shooting an image in a stable state of the liquid suction core at the position of the visual window through a high-speed camera; gradually increasing the input power of the heating rod, and recording temperature data of a corresponding experiment cavity and visual images of evaporation and boiling of the liquid suction core during liquid suction;
and after the test and the recording are finished, the external power supply and the cooling water system of the condensing plate are closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310106982.1A CN116294742A (en) | 2023-02-09 | 2023-02-09 | Wick capillary reflux boiling visualization device and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310106982.1A CN116294742A (en) | 2023-02-09 | 2023-02-09 | Wick capillary reflux boiling visualization device and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116294742A true CN116294742A (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310106982.1A Pending CN116294742A (en) | 2023-02-09 | 2023-02-09 | Wick capillary reflux boiling visualization device and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116294742A (en) |
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2023
- 2023-02-09 CN CN202310106982.1A patent/CN116294742A/en active Pending
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