Porous copper-wood fiber/polystyrene double-layer composite capillary core for loop heat pipe and preparation method thereof

Abstract

The invention discloses a porous copper-wood fiber / polystyrene double-layer composite capillary core for a loop heat pipe and a preparation method thereof. NaCl or anhydrous sodium carbonate is ground and sieved to obtain a particle size of 50-75 μm. The pore-forming agent is dry and ready for use; polystyrene, wood fiber and pore-forming agent are mixed and pressed, and the porous wood fiber / polystyrene composite capillary core is obtained by sintering and washing; the electrolytic copper powder and the pore-forming agent are mixed and pressed The porous copper-wood fiber / polystyrene double-layer composite capillary core is obtained by sintering and washing; then the two are superimposed and compounded, wherein the porous copper core is close to the evaporation end of the loop heat pipe, and the porous composite material capillary core is close to the loop heat pipe compensation room. The invention applies the double-layer composite capillary core to the loop heat pipe, which can not only strengthen the internal heat and mass transfer, but also form a gradient thermal resistance in the radial direction, thereby reducing back-to-back heat leakage and effectively reducing the operation of the loop heat pipe. temperature, stabilizing the phase change interface, thereby improving the operating performance of the loop heat pipe.

Description

technical field [0001] The invention relates to a capillary core, in particular to a porous copper-wood fiber / polystyrene double-layer composite capillary core for a loop heat pipe and a preparation method thereof, belonging to the technical field of heat transfer. Background technique [0002] The loop heat pipe is a high-efficiency passive heat transfer device that uses the phase change of the working fluid to transfer heat. It has the advantages of strong heat transfer capacity, low heat transfer resistance, long transmission distance, good isothermal performance, and no moving parts. It is suitable for high heat flow Heat dissipation of high-density electronic devices and thermal control of spacecraft. The loop heat pipe is a separated heat pipe, which is mainly composed of an evaporator, a condenser, a steam pipe, a liquid pipe and a compensation chamber. The evaporator is separated from the condenser, and connected by smooth steam pipes and liquid pipes. Only porous c...

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Problems solved by technology

However, none of the above designs have comprehensively considered the balance between the effective evaporation of the capillary core close to the heat source and the low back conduction problem (heat leakage) in the loop heat pipe.

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