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. The preparation method of the porous copper-wood fiber / polystyrene double-layer composite capillary core comprises the following steps that sodium chloride or anhydrous sodium carbonate are taken to grind, sieving is carried out to obtain a pore forming agent with the particle size of 50 to 75 microns, drying for later use is carried out; polystyrene, wood fibers and the pore forming agent are mixed, tabletting is carried out, a porous woodfiber / polystyrene composite material capillary core is obtained through sintering and washing; an electrolytic copper powder and the pore forming agent are mixed, tabletting is carried out, and a porous copper-wood fiber / polystyrene double-layer composite capillary core is obtained through sintering and washing; and the porous wood fiber / polystyrene composite material capillary core and the porous copper-wood fiber / polystyrene double-layer composite capillary core are superimposed and composite,a porous copper core is close to the evaporation end of the loop heat pipe, and the porous composite material capillary core is close to a compensation chamber of the loop heat pipe. According to the porous copper-wood fiber / polystyrene double-layer composite capillary core for the loop heat pipe and the preparation method thereof, the double-layer composite capillary core is applied to the loop heat pipe, internal heat and mass transfer can be enhanced, gradient heat resistance can be formed in the radial direction, back heat leakage is reduced, the operating temperature of the loop heat pipe is effectively reduced, a phase change interface is stabilized, and therefore the operating performance of the loop heat pipe is improved.

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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