阅读说明：本技术 一种高温热管吸液芯传热极限实验装置及方法 (High-temperature heat pipe liquid absorption core heat transfer limit experimental device and method ) 是由 王成龙 田智星 黄金露 孙奇士 郭凯伦 张大林 田文喜 秋穗正 苏光辉 于 2021-10-19 设计创作，主要内容包括：本发明公开了一种高温热管吸液芯传热极限实验装置及方法,该装置包括上封板、加热板、下封板、左侧封液板、左侧封气板、右侧封液板、右侧封气板、压紧板、吸液芯样品、气体预热器、第一储气室、第一伺服泵、第二储气室、第二伺服泵、工质储藏室、真空泵机组、压差变送器、阀门等。本发明可实现对高温热管吸液芯传热极限的实验研究,获得高温热管毛细极限、夹带极限、沸腾极限等传热极限的可视化研究。(The invention discloses a high-temperature heat pipe liquid absorption core heat transfer limit experiment device and a high-temperature heat pipe liquid absorption core heat transfer limit experiment method. The invention can realize the experimental study on the heat transfer limit of the high-temperature heat pipe liquid absorption core and obtain the visual study on the heat transfer limits such as the capillary limit, the entrainment limit, the boiling limit and the like of the high-temperature heat pipe.)

1. The utility model provides a high temperature heat pipe imbibition liquid core heat transfer limit experimental apparatus which characterized in that: comprises an upper sealing plate (10), a heating plate (20), a lower sealing plate (30), a transparent side view plate (40), a left side air sealing plate (11), a left side liquid sealing plate (12), a right side air sealing plate (13), a right side liquid sealing plate (14), a heating wire (21), a liquid absorption core sample (100), a solid sample (101), a pressing plate (200), a differential pressure transmitter (300), a first gas storage chamber (110) and a first gas storage valve (111), the system comprises a gas preheater (112), a first servo pump (120), a first servo valve (121), a gas flowmeter (130), a second gas storage valve (131), a second gas storage chamber (132), a flowmeter (140), a second servo pump (145), a second servo valve (141), a vacuum pump unit (146), a vacuum pump valve (142), a working medium storage chamber (00), a working medium output valve (01) and a working medium input valve (02); go up shrouding (10), pressure strip (200), imbibition sample (100), hot plate (20), shrouding (30) superpose by last to lower successive layer down, both ends are connected about imbibition sample (100) in pressure differential transmitter (300), measure both ends pressure differential about imbibition sample (100), solid sample (101) are for replacing imbibition sample (100) in the experimentation, transparent side is looked board (40) and is located pressure strip (200), the side around imbibition sample (100), left side gas board (11) and right side gas board (13) are located the left and right sides of pressure strip (200) respectively, left side liquid board (12) and right side liquid board (14) are located imbibition sample (100) left and right sides respectively, heater strip (21) are located hot plate (20) inside evenly distributed, go up shrouding (10), hot plate (20), left side gas board (11), left side liquid board (12) are sealed to the left side, The right side gas sealing plate (13) and the right side liquid sealing plate (14) create a sealed space for the pressing plate (200) and the liquid absorption core sample (100), the left side gas sealing plate (11) is connected to the first gas storage chamber (110) through the gas preheater (112) and the first gas storage valve (111), the left side liquid sealing plate (12) is connected to the first gas storage chamber (110) and the first servo pump (120) through the first gas storage valve (111) and the first servo valve (121) respectively, the first servo pump (120) is connected to the working medium storage chamber (00) through the working medium output valve (01), the right side gas sealing plate (13) is connected to the second gas storage chamber (132) through the gas flow meter (130) and the second gas storage valve (131), the right side liquid sealing plate (14) is connected to the flow meter (140), the flow meter (140) is connected to the second servo pump (145) and the unit (146) through the second servo valve (141) and the vacuum pump valve (142) respectively, the second servo pump (145) is connected with the working medium storage chamber (00) through the working medium input valve (02).

2. The high temperature heat pipe wick heat transfer limit experiment apparatus of claim 1, wherein: the gas in the first gas storage chamber (110) and the second gas storage chamber (132) is inert gas or working medium steam.

3. The high temperature heat pipe wick heat transfer limit experiment apparatus of claim 1, wherein: the wick sample (100) is of one or more composite structures of a wire mesh, a channel, sintered powder, sintered fiber and a loop.

4. The high temperature heat pipe wick heat transfer limit experiment apparatus of claim 1, wherein: the working medium in the working medium storeroom (00) adopts high-temperature liquid metal, high-temperature molten salt, water or organic matters.

5. The high temperature heat pipe wick heat transfer limit experiment apparatus of claim 1, wherein: the transparent side-view plate (40) is made of acrylic plates, transparent ceramics or quartz glass.

6. The high temperature heat pipe wick heat transfer limit experiment apparatus of claim 1, wherein: the lower sealing plate (30) can realize six-degree-of-freedom motion.

7. A method of operating a high temperature heat pipe wick heat transfer limit test apparatus as claimed in any one of claims 1 to 6, wherein:

and (3) measuring the leakage volume: a solid sample (101) is adopted to replace a wick sample (100), a first gas storage valve (111) and a second gas storage valve (131) are opened, and gas in the first gas storage chamber (110) passes through the first gas storage valve (111), a gas preheater (112), a left gas sealing plate (11), the solid sample (101), a pressing plate (200), a right gas sealing plate (13) and a second gas storage valve (131)The second gas storage valve (131) reaches the second gas storage chamber (132), the first gas storage valve (111) and the second gas storage valve (131) are closed after ventilation is carried out for more than 5min, the vacuum pump unit (146) is started, the vacuum pump valve (142) is opened, and the vacuum degree is reduced to 10^-4After Pa, a vacuum pump valve (142) and a vacuum pump unit (146) are closed, the working medium in the working medium storage chamber (00) is converted into liquid working medium, and the initial volume V is recorded₀Opening the working medium output valve (01), the working medium input valve (02), the first servo valve (121), the second servo valve (141), the first servo pump (120) and the second servo pump (145), and recording the volume V of the liquid working medium in the working medium storage chamber (00) after the reading of the flowmeter (140) is stable₁Therefore leakage volume V_loss＝V₀-V₁；

Determination of characteristic parameters of a wick sample (100): measuring the length L, cross-sectional area A, geometric volume V of a wick sample (100)₂And the aperture r is obtained by replacing a solid sample (101) with a wick sample (100), opening a first gas storage valve (111) and a second gas storage valve (131), allowing gas in the first gas storage chamber (110) to pass through the first gas storage valve (111), a gas preheater (112), a left gas sealing plate (11), the wick sample (100), a pressure plate (200), a right gas sealing plate (13) and the second gas storage valve (131) to reach the second gas storage chamber (132), closing the first gas storage valve (111) and the second gas storage valve (131) after ventilation for more than 5min, opening a vacuum pump unit (146), opening a vacuum pump valve (142), and reducing the vacuum degree to 10^-4After Pa, a vacuum pump valve (142) and a vacuum pump unit (146) are closed, the working medium in the working medium storage chamber (00) is converted into liquid working medium, and the initial volume V is recorded₃Opening a working medium output valve (01), a working medium input valve (02), a first servo valve (121), a second servo valve (141), a first servo pump (120) and a second servo pump (145), recording the flow m stably by the reading of a flowmeter (140), and recording the volume V of the liquid working medium in a working medium storage chamber (00)₄Recording the reading Δ P of the differential pressure transducer (300) and the porosity ε of the wick sample (100) ═ V₃-V₄-V_loss)/V₂The permeability of the wick sample (100) is K ═ m μ L)/(ρ a ∈ Δ P; mu is the dynamic viscosity of the liquid working medium, and rho is the density of the liquid working medium;

wick sample (100) capillary limit determination: measuring the aperture r of the liquid absorption core sample (100), replacing the solid sample (101) with the liquid absorption core sample (100), adjusting the working angle of the lower sealing plate (30) to be a design angle, opening a first gas storage valve (111) and a second gas storage valve (131), leading gas in the first gas storage chamber (110) to reach the second gas storage chamber (132) through the first gas storage valve (111), a gas preheater (112), a left gas sealing plate (11), the liquid absorption core sample (100), a pressing plate (200), a right gas sealing plate (13) and the second gas storage valve (131), closing the first gas storage valve (111) and the second gas storage valve (131) after ventilating for more than 5min, opening a vacuum pump unit (146), opening a vacuum pump valve (142), and reducing the vacuum degree to 10^-4After Pa, closing a vacuum pump valve (142) and a vacuum pump unit (146), converting working media in a working medium storage chamber (00) into liquid working media, opening a working medium output valve (01), a working medium input valve (02), a first servo valve (121), a second servo valve (141), a first servo pump (120) and a second servo pump (145), and adjusting the first servo pump (120) or the second servo pump (145) to enable the reading number delta P of a pressure difference transmitter (300) to be 2 sigma/r, wherein sigma is the surface tension of the liquid working media, recording the flow m of a flow meter (140), and the flow m at the moment is the capillary flow of the liquid suction core sample (100) at the capillary limit;

wick sample (100) entrainment limit determination: removing the pressing plate (200), replacing the solid sample (101) with the wick sample (100), adjusting the working angle of the lower sealing plate (30) to a design angle, opening the first gas storage valve (111) and the second gas storage valve (131), leading the gas in the first gas storage chamber (110) to reach the second gas storage chamber (132) through the first gas storage valve (111), the gas preheater (112), the left gas sealing plate (11), the wick sample (100), the pressing plate (200), the right gas sealing plate (13) and the second gas storage valve (131), closing the first gas storage valve (111) and the second gas storage valve (131) after ventilating for more than 5min, opening the vacuum pump set (146), opening the vacuum pump valve (142), and reducing the vacuum degree to 10^-4After Pa, the vacuum pump valve (142) and the vacuum pump unit (146) are closed, the working medium in the working medium storage chamber (00) is converted into liquid working medium, and the working medium output valve (01), the working medium input valve (02), the first servo valve (121), the second servo valve (141), the first servo pump (120) and the second servo pump are openedThe liquid working medium in the liquid absorbing core sample (100) is controlled to flow from the right side to the left side by adjusting the first servo pump (120) or the second servo pump (145) and the liquid level and the flow of the liquid working medium are controlled, the first gas storage valve (111) and the second gas storage valve (131) are opened, the gas in the first gas storage chamber (110) reaches the second gas storage chamber (132) through the first gas storage valve (111), the gas preheater (112), the left side gas sealing plate (11), the liquid absorbing core sample (100), the right side gas sealing plate (13) and the second gas storage valve (131), the first gas storage valve (111) or the second gas storage valve (131) is adjusted to control the gas flowing speed, whether entrainment occurs or not is observed through the transparent side view plate (40), and the flow m of the gas flowmeter (130) during entrainment is recorded₁And flow rate m of the flowmeter (140)₂(ii) a The flow rates m1 and m2 at this time are respectively the gas flow rate and the liquid flow rate of the liquid absorption core sample (100) under the entrainment limit;

wick sample (100) boiling limit determination: removing the pressing plate (200), replacing the solid sample (101) with the wick sample (100), adjusting the working angle of the lower sealing plate (30) to a design angle, opening the first gas storage valve (111) and the second gas storage valve (131), leading the gas in the first gas storage chamber (110) to reach the second gas storage chamber (132) through the first gas storage valve (111), the gas preheater (112), the left gas sealing plate (11), the wick sample (100), the pressing plate (200), the right gas sealing plate (13) and the second gas storage valve (131), closing the first gas storage valve (111) and the second gas storage valve (131) after ventilating for more than 5min, opening the vacuum pump set (146), opening the vacuum pump valve (142), and reducing the vacuum degree to 10^-4After Pa, a vacuum pump valve (142) and a vacuum pump unit (146) are closed, working medium in a working medium storage chamber (00) is converted into liquid working medium, a working medium output valve (01), a working medium input valve (02), a first servo valve (121), a second servo valve (141), a first servo pump (120) and a second servo pump (145) are opened, the liquid level and the flow of the liquid working medium in the liquid absorbing core sample (100) are controlled by adjusting the first servo pump (120) or the second servo pump (145), the power of the heating wire (21) is adjusted, the time of bubble generation in the liquid absorbing core sample (100) is observed through a transparent side view plate (40), and the power of the heating wire (21) at the moment is recorded as a boiling limit.

Technical Field

The invention relates to the technical field of phase change heat exchange equipment, in particular to a heat transfer limit experiment device and method for a high-temperature heat pipe liquid absorption core.

Background

The heat pipe is passive heat transfer equipment utilizing phase change of working medium to transfer heat, and has the advantages of simple structure, passive property and the like. Working media in the heat pipe work in a sealed pipe shell cavity, and observation is difficult to achieve through visual means, and particularly direct observation is difficult to achieve due to the fact that liquid metal is adopted as a working medium for the high-temperature heat pipe. The heat transfer limit imposes a limit on the heat transfer capability of the heat pipe, and the types such as capillary limit, entrainment limit, boiling limit, etc. greatly limit the heat transfer capacity of the heat pipe, and may even cause the failure of the heat pipe.

Disclosure of Invention

The invention provides a heat transfer limit experimental device and method for a high-temperature heat pipe liquid absorption core, aiming at visually researching the heat transfer limit in the high-temperature heat pipe liquid absorption core, and realizing the visual experiment of the heat transfer limit.

The invention adopts the following design scheme:

a high-temperature heat pipe liquid absorption core heat transfer limit experimental device and a method thereof comprise an upper sealing plate 10, a heating plate 20, a lower sealing plate 30, a transparent side view plate 40, a left side air sealing plate 11, a left side liquid sealing plate 12, a right side air sealing plate 13, a right side liquid sealing plate 14, a heating wire 21, a liquid absorption core sample 100, a solid sample 101, a pressing plate 200, a differential pressure transmitter 300, a first air storage chamber 110, a first air storage valve 111, a gas preheater 112, a first servo pump 120, a first servo valve 121, a gas flow meter 130, a second air storage valve 131, a second air storage chamber 132, a flow meter 140, a second servo pump 145, a second servo valve 141, a vacuum pump unit 146, a vacuum pump valve 142, a working medium storage chamber 00, a working medium output valve 01 and a working medium input valve 02; the upper sealing plate 10, the pressing plate 200, the wick sample 100, the heating plate 20 and the lower sealing plate 30 are stacked layer by layer from top to bottom, the differential pressure transmitter 300 is connected to the left end and the right end of the wick sample 100 to measure the differential pressure between the left end and the right end of the wick sample 100, the solid sample 101 is used for replacing the wick sample 100 in the experimental process, the transparent side viewing plate 40 is positioned on the front side and the back side of the pressing plate 200 and the wick sample 100, the left side gas sealing plate 11 and the right side gas sealing plate 13 are respectively positioned on the left side and the right side of the pressing plate 200, the left side liquid sealing plate 12 and the right side liquid sealing plate 14 are respectively positioned on the left side and the right side of the wick sample 100, the heating wires 21 are uniformly distributed in the heating plate 20, the upper sealing plate 10, the heating plate 20, the left side gas sealing plate 11, the left side liquid sealing plate 12, the right side gas sealing plate 13 and the right side liquid sealing plate 14 create a sealed space for the pressing plate 200 and the wick sample 100, the left side gas sealing plate 11 is connected to the first gas storage chamber 110 through the gas preheater 112 and the first gas storage valve 111, the left side liquid sealing plate 12 is connected to the first gas storage chamber 110 and the first servo pump 120 through the first gas storage valve 111 and the first servo valve 121 respectively, the first servo pump 120 is connected to the working medium storage chamber 00 through the working medium output valve 01, the right side gas sealing plate 13 is connected to the second gas storage chamber 132 through the gas flow meter 130 and the second gas storage valve 131, the right side liquid sealing plate 14 is connected to the flow meter 140, the flow meter 140 is connected to the second servo pump 145 and the vacuum pump unit 146 through the second servo valve 141 and the vacuum pump valve 142 respectively, and the second servo pump 145 is connected to the working medium storage chamber 00 through the working medium input valve 02.

The gas inside the first and second gas storage chambers 110 and 132 is inert gas or working medium steam.

The wick sample 100 may be formed from one or more composite structures such as a mesh, channels, sintered powder, sintered fiber, loops, and the like.

The working medium in the working medium storeroom 00 can be selected from high-temperature liquid metal, high-temperature molten salt, water or organic matters.

The transparent side viewing plate 40 may be made of acrylic plate, transparent ceramic or quartz glass.

The lower sealing plate 30 may implement six degrees of freedom of motion.

Compared with the prior art, the invention has the following advantages:

the method can measure the characteristic parameters such as porosity, permeability and the like aiming at the wick sample (100); the capillary pressure difference is simulated through the cooperation of the first servo pump (120), the second servo pump (145) and the pressure difference transmitter (300), and the simulation of the capillary limit is realized; the liquid level of the liquid absorption core sample (100) is adjusted through the first servo pump (120) and the second servo pump (145), the gas flowing speed is adjusted through the first air storage chamber (110) and the second air storage chamber (132), the simulation of gas-liquid two-phase countercurrent in the heat pipe is realized, and the generation of entrainment and the influence of the structure of the liquid absorption core sample (100) on the entrainment are researched; bubbles in the liquid absorption core sample (100) are observed through the transparent side-view plate (40), and the gas pressure is adjusted through the first gas storage chamber (110) and the second gas storage chamber (132), so that the boiling limit simulation under different working conditions is realized.

The invention provides a heat transfer limit experimental device and method for a high-temperature heat pipe liquid absorption core aiming at the problem of limited heat transfer performance of a heat pipe.

Drawings

FIG. 1 is a schematic diagram of a high temperature heat pipe wick heat transfer limit experimental apparatus of the present invention.

Detailed Description

The invention will now be further described with reference to the following examples, and the accompanying drawings:

as shown in fig. 1, the heat transfer limit experiment apparatus for liquid absorption core of high temperature heat pipe of the present invention comprises an upper sealing plate 10, a heating plate 20, a lower sealing plate 30, a transparent side view plate 40, a left side gas sealing plate 11, a left side liquid sealing plate 12, a right side gas sealing plate 13, a right side liquid sealing plate 14, a heating wire 21, a liquid absorption core sample 100, a solid sample 101, a pressure plate 200, a differential pressure transmitter 300, a first gas storage chamber 110, a first gas storage valve 111, a gas preheater 112, a first servo pump 120, a first servo valve 121, a gas flow meter 130, a second gas storage valve 131, a second gas storage chamber 132, a flow meter 140, a second servo pump 145, a second servo valve 141, a vacuum pump unit 146, a vacuum pump valve 142, a working medium storage chamber 00, a working medium output valve 01, and a working medium input valve 02; the upper sealing plate 10, the pressing plate 200, the wick sample 100, the heating plate 20 and the lower sealing plate 30 are stacked layer by layer from top to bottom, the differential pressure transmitter 300 is connected to the left end and the right end of the wick sample 100 to measure the differential pressure between the left end and the right end of the wick sample 100, the solid sample 101 is used for replacing the wick sample 100 in the experimental process, the transparent side viewing plate 40 is positioned on the front side and the back side of the pressing plate 200 and the wick sample 100, the left side gas sealing plate 11 and the right side gas sealing plate 13 are respectively positioned on the left side and the right side of the pressing plate 200, the left side liquid sealing plate 12 and the right side liquid sealing plate 14 are respectively positioned on the left side and the right side of the wick sample 100, the heating wires 21 are uniformly distributed in the heating plate 20, the upper sealing plate 10, the heating plate 20, the left side gas sealing plate 11, the left side liquid sealing plate 12, the right side gas sealing plate 13 and the right side liquid sealing plate 14 create a sealed space for the pressing plate 200 and the wick sample 100, the left side gas sealing plate 11 is connected to the first gas storage chamber 110 through the gas preheater 112 and the first gas storage valve 111, the left side liquid sealing plate 12 is connected to the first gas storage chamber 110 and the first servo pump 120 through the first gas storage valve 111 and the first servo valve 121 respectively, the first servo pump 120 is connected to the working medium storage chamber 00 through the working medium output valve 01, the right side gas sealing plate 13 is connected to the second gas storage chamber 132 through the gas flow meter 130 and the second gas storage valve 131, the right side liquid sealing plate 14 is connected to the flow meter 140, the flow meter 140 is connected to the second servo pump 145 and the vacuum pump unit 146 through the second servo valve 141 and the vacuum pump valve 142 respectively, and the second servo pump 145 is connected to the working medium storage chamber 00 through the working medium input valve 02.

In a preferred embodiment of the present invention, the gas inside the first and second air reservoirs 110 and 132 is an inert gas or working medium vapor.

As a preferred embodiment of the present invention, the wick sample 100 may be selected from one or more of a mesh, a channel, a sintered powder, a sintered fiber, a loop, and the like.

As a preferred embodiment of the present invention, the working medium in the working medium storage chamber 00 may be high-temperature liquid metal, high-temperature molten salt, water, or organic matter.

As a preferred embodiment of the present invention, the transparent side viewing plate 40 may be made of acrylic plate, transparent ceramic or quartz glass.

In a preferred embodiment of the present invention, the lower sealing plate 30 can realize six-degree-of-freedom motion.

The working principle of the invention is as follows: .

And (3) measuring the leakage volume: replacing the wick sample 100 with a solid sample 101, opening a first gas storage valve 111 and a second gas storage valve 131, allowing gas in the first gas storage chamber 110 to pass through the first gas storage valve 111, a gas preheater 112, a left gas sealing plate 11, the solid sample 101, a pressure plate 200, a right gas sealing plate 13 and the second gas storage valve 131 to reach a second gas storage chamber 132, ventilating for more than 5min, closing the first gas storage valve 111 and the second gas storage valve 131, starting a vacuum pump unit 146, opening a vacuum pump valve 142, and reducing the vacuum degree to 10^-4After Pa, the vacuum pump valve 142 and the vacuum pump unit 146 are closed, the working medium in the working medium storage chamber 00 is converted into the liquid working medium and the initial volume V0 is recorded, the working medium output valve 01, the working medium input valve 02, the first servo valve 121, the second servo valve 141, the first servo pump 120 and the second servo pump 145 are opened, and the volume V of the liquid working medium in the working medium storage chamber 00 is recorded after the reading of the flow meter 140 is stable₁Therefore leakage volume V_loss＝V₀-V₁。

Determination of the characteristic parameters of the wick sample 100: measuring the length L, the sectional area A, the geometric volume V2 and the aperture r of the wick sample 100, replacing the solid sample 101 with the wick sample 100, opening a first gas storage valve 111 and a second gas storage valve 131, leading the gas in the first gas storage chamber 110 to pass through the first gas storage valve 111, a gas preheater 112, a left gas sealing plate 11, the wick sample 100, a pressure plate 200, a right gas sealing plate 13 and the second gas storage valve 131 and reach a second gas storage chamber 132, leading the gas to pass through for more than 5min, closing the first gas storage valve 111 and the second gas storage valve 131, starting a vacuum pump unit 146, opening a vacuum pump valve 142, and reducing the vacuum degree to 10^-4After Pa, the vacuum pump valve 142 and the vacuum pump unit 146 are closed, the working medium in the working medium storeroom 00 is converted into the liquid working medium, and the initial volume V is recorded₃Opening the working medium output valve 01, the working medium input valve 02, the first servo valve 121, the second servo valve 141, the first servo pump 120 and the second servo pump 145, recording the flow m when the flowmeter 140 counts stably, and recording the working medium storageThe volume of the liquid working medium in the storeroom 00V 4, the reading delta P of the differential pressure transmitter 300, and the porosity epsilon of the liquid absorbing core sample 100 (V)₃-V₄-V_loss) V2, the permeability of wick sample 100 was K ═ m μ L)/(ρ a ∈ Δ P. Wherein mu is the dynamic viscosity of the liquid working medium, and rho is the density of the liquid working medium.

Wick sample 100 capillary limit determination: measuring the aperture r of the wick sample 100, replacing the solid sample 101 with the wick sample 100, adjusting the working angle of the lower sealing plate 30 to a design angle, opening the first gas storage valve 111 and the second gas storage valve 131, allowing the gas in the first gas storage chamber 110 to pass through the first gas storage valve 111, the gas preheater 112, the left gas sealing plate 11, the wick sample 100, the pressing plate 200, the right gas sealing plate 13 and the second gas storage valve 131 to reach the second gas storage chamber 132, ventilating for more than 5min, closing the first gas storage valve 111 and the second gas storage valve 131, starting the vacuum pump unit 146, opening the vacuum pump valve 142, and reducing the vacuum degree to 10^-4After Pa, the vacuum pump valve 142 and the vacuum pump unit 146 are closed, the working medium in the working medium storage chamber 00 is converted into a liquid working medium, the working medium output valve 01, the working medium input valve 02, the first servo valve 121, the second servo valve 141, the first servo pump 120 and the second servo pump 145 are opened, the first servo pump 120 or the second servo pump 145 is adjusted, the reading value Δ P of the differential pressure transmitter 300 is 2 σ/r, σ is the surface tension of the liquid working medium, the flow m of the flow meter 140 is recorded, and the flow m at the moment is the capillary flow of the liquid suction core sample 100 at the capillary limit.

Wick sample 100 entrainment limit determination: removing the pressing plate 200, replacing the solid sample 101 with the wick sample 100, adjusting the working angle of the lower sealing plate 30 to a design angle, opening the first gas storage valve 111 and the second gas storage valve 131, allowing the gas in the first gas storage chamber 110 to pass through the first gas storage valve 111, the gas preheater 112, the left gas sealing plate 11, the wick sample 100, the pressing plate 200, the right gas sealing plate 13 and the second gas storage valve 131 to reach the second gas storage chamber 132, ventilating for more than 5min, closing the first gas storage valve 111 and the second gas storage valve 131, starting the vacuum pump unit 146, opening the vacuum pump valve 142, and reducing the vacuum degree to 10^-4Pa back-off vacuum pump valve 142 and vacuum pump unit146, converting the working medium in the working medium storage chamber 00 into a liquid working medium, opening the working medium output valve 01, the working medium input valve 02, the first servo valve 121, the second servo valve 141, the first servo pump 120 and the second servo pump 145, adjusting the first servo pump 120 or the second servo pump 145 to control the liquid working medium in the liquid absorption core sample 100 to flow from the right side to the left side, and controlling the liquid level and flow rate of the liquid working medium, opening the first gas storage valve 111 and the second gas storage valve 131, allowing the gas in the first gas storage chamber 110 to reach the second gas storage chamber 132 through the first gas storage valve 111, the gas preheater 112, the left gas sealing plate 11, the wick sample 100, the right gas sealing plate 13 and the second gas storage valve 131, adjusting the first gas storage valve 111 or the second gas storage valve 131 to control the gas flow rate, whether entrainment occurred or not was observed through the transparent sideview plate 40, and the flow rate m1 of the gas flowmeter 130 and the flow rate m2 of the flowmeter 140 at the time of entrainment were recorded. The flow rates m1 and m2 at this time are the gas flow rate and the liquid flow rate of the wick sample 100 at the entrainment limit, respectively.

Wick sample 100 boiling limit determination: removing the pressing plate 200, replacing the solid sample 101 with the wick sample 100, adjusting the working angle of the lower sealing plate 30 to a design angle, opening the first gas storage valve 111 and the second gas storage valve 131, allowing the gas in the first gas storage chamber 110 to pass through the first gas storage valve 111, the gas preheater 112, the left gas sealing plate 11, the wick sample 100, the pressing plate 200, the right gas sealing plate 13 and the second gas storage valve 131 to reach the second gas storage chamber 132, ventilating for more than 5min, closing the first gas storage valve 111 and the second gas storage valve 131, starting the vacuum pump unit 146, opening the vacuum pump valve 142, and reducing the vacuum degree to 10^-4After Pa, the vacuum pump valve 142 and the vacuum pump unit 146 are closed, the working medium in the working medium storage chamber 00 is converted into the liquid working medium, the working medium output valve 01, the working medium input valve 02, the first servo valve 121, the second servo valve 141, the first servo pump 120 and the second servo pump 145 are opened, the liquid level and the flow of the liquid working medium in the liquid absorption core sample 100 are controlled by adjusting the first servo pump 120 or the second servo pump 145, the power of the heating wire 21 is adjusted, the time of bubble generation in the liquid absorption core sample 100 is observed through the transparent side view plate 40, and the power of the heating wire 21 at the moment is recorded, namely the boiling limit.