A variable aperture capillary core applied to a loop heat pipe system and its processing method

Abstract

The invention discloses a variable aperture capillary core applied to a loop heat pipe system and a processing method thereof, belonging to the field of porous medium phase change heat transfer and flow. The capillary core of the invention selects powder particles with a higher melting point and fibers with a lower melting point to be mixed and sintered, and the temperature is controlled so that the fibers are completely sintered to form a capillary core skeleton. Aperture; apply the capillary core to the loop heat pipe, automatically adjust the powder particle diameter under different heat loads, adjust the suction force of the capillary core, prevent the phase change interface from going deep into the capillary core, and reduce the heat transfer heat when the capillary core is working At the same time, it can reduce the flow resistance, thereby improving the operating performance of the loop heat pipe.

Description

technical field [0001] The invention relates to the technical field of phase transition and flow of porous media, and more particularly, to a variable aperture capillary core applied to a loop heat pipe system and a processing method thereof, and can also be applied to the fields of aerospace thermal control and electronic equipment cooling. . Background technique [0002] Loop Heat Pipe (LHP for short) is a high-efficiency passive heat transfer device that uses the phase change of the working medium to transfer heat. It has the advantages of strong heat transfer capability, low heat transfer resistance, long transmission distance, and no moving parts. The loop heat pipe is a separate heat pipe composed of an evaporator, a compensation chamber, a steam pipe, a liquid pipe and a condenser. Its working process is as follows. figure 1 Shown: After the evaporator 6 and the heating surface of the heat-dissipating component are attached and heated, the heat is introduced into the...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the disadvantages of different thermal loads and poor operating performance of the loop heat pipe in the prior art, and provide a variable-aperture capillary wick applied to the loop heat pipe system and its processing method. During operation, according to the different heat loads, the powder particles inside the capillary core can move, thereby changing its pore size, quickly meeting its suction force requirements, reducing flow resistance, optimizing the heat transfer characteristics of the system, stabilizing the evaporation interface, and reducing evaporation. thermal resistance, thereby improving the operating performance of the loop heat pipe

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