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Alkali metal heat pipe wick and preparation method thereof and heat pipe

An alkali metal and liquid-absorbing core technology, applied in the field of heat transfer, can solve the problems of the maximum heat transfer rate limiting the heat transfer capacity of heat pipes, the capillary heat transfer limit limit of alkali metal heat pipes, etc., to improve the heat transfer limit, increase the capillary limit, easy-to-achieve effects

Pending Publication Date: 2022-02-08
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Alkali metal heat pipes rely on the latent heat generated by the phase change of substances to achieve heat transfer. They have the advantages of high heat transfer efficiency, good isothermal performance, and strong environmental adaptability. However, there are a series of maximum heat transfer rates that can be achieved under certain temperature conditions in heat pipes. Heat transfer capacity, i.e. the heat transfer limit of the heat pipe
Studies have shown that alkali metal heat pipes are mainly limited by the capillary heat transfer limit in the high power operating range

Method used

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  • Alkali metal heat pipe wick and preparation method thereof and heat pipe
  • Alkali metal heat pipe wick and preparation method thereof and heat pipe
  • Alkali metal heat pipe wick and preparation method thereof and heat pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The alkali metal heat pipe liquid-absorbing core includes metal foam, and the surface of the metal foam is formed with alkali metal needle-like nanoparticles.

[0052] In this embodiment, the metal foam is copper foam of 120 μm, and the specific preparation process of the liquid-absorbing core is as follows:

[0053] Immerse 120 μm copper foam in 2.5 mol L at 70 °C -1 Potassium hydroxide and 0.065mol L -1 Soak in the mixed solution of potassium persulfate for 30 minutes, take out the foamed metal flakes, wash them and bake them in a high-temperature oven at 180°C for 2 hours. The surface of the foamed metal flakes can form needle-like nanostructures, such as figure 2 shown.

[0054] In this embodiment, needle-like nanoparticles with a diameter of 500-800 nm are formed, and the equivalent micropore radius is about 8 um.

Embodiment 2

[0056] This embodiment is based on embodiment 1, and the difference with embodiment 1 is:

[0057] Immerse 120 μm copper foam in 1 mol L at 50 °C -1 Potassium hydroxide and 0.026mol L -1 Soak in a mixed solution of potassium persulfate for 50 minutes.

[0058] In this embodiment, needle-shaped nanoparticles with a diameter of 600-900 nm are formed, and the equivalent micropore radius is about 15 um.

Embodiment 3

[0060] This embodiment is based on embodiment 1, and the difference with embodiment 1 is:

[0061] Immerse 120 μm copper foam in 3 mol L at 80 °C -1 Potassium hydroxide and 0.078mol L -1 Soak in a mixed solution of potassium persulfate for 30 minutes.

[0062] In this embodiment, needle-like nanoparticles with a diameter of 400-700nm can be formed, and the equivalent micropore radius is about 6um.

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Abstract

The invention discloses an alkali metal heat pipe wick and a preparation method thereof and a heat pipe. The alkali metal heat pipe wick comprises foam metal, and alkali metal needle-shaped nanoparticles are formed on the surface of the foam metal. The preparation method comprises the following steps of: immersing foam metal into a mixed solution containing alkali metal ions, and then taking out the foam metal for high-temperature baking. A micro-nano composite capillary structure is formed by redox reaction and a method of compounding needle-shaped nanoparticles on the surface of foam metal, the micropore diameter is further reduced, meanwhile, the wettability of a working medium in the micropores of the capillary structure is improved, the contact angle is reduced, and the capillary limit is improved.

Description

technical field [0001] The invention relates to the technical field of heat transfer, in particular to an alkali metal heat pipe liquid-absorbing core, a preparation method thereof and a heat pipe. Background technique [0002] A typical heat pipe structure such as figure 1 As shown, the heat pipe is a vacuum metal tube with both ends closed. According to the flow state of the working fluid, it can be divided into evaporation section, condensation section and adiabatic section. The adiabatic section can be selected according to the actual situation. Generally close to the inner wall of the heat pipe is one or more layers of porous media filled with working fluid, which is called a liquid-absorbing core. The working fluid receives the heat from the heat source and passes through the heat pipe wall in the evaporation section, gradually evaporates and enters the steam chamber through the gas-liquid interface of the liquid-absorbing core, transports along the adiabatic section,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D15/02F28D15/04
CPCF28D15/0283F28D15/046
Inventor 马誉高何晓强邓坚丁书华柴晓明鲜麟习蒙蒙张卓华杜政瑀钟睿诚苏东川陈仕龙鲍辉
Owner NUCLEAR POWER INSTITUTE OF CHINA
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