Variable-pore-diameter capillary core applied to loop heat pipe system, and machining method thereof

Abstract

The invention discloses a variable-pore-diameter capillary core applied to a loop heat pipe system, and a machining method thereof, and belongs to the field of porous medium phase-change heat transfer and flowing. The capillary core disclosed by the invention is formed through mixed sintering for high-melting-point powder particles and low-melting-point fibers, a temperature is controlled to completely sinter the fibers to form a capillary core framework, and the powder particles are not sintered and capable of moving in the space of a fiber framework according to a heat load to automatically adjust pore diameters. The capillary core is applied to a loop heat pipe, the pore diameters of the powder particles are automatically adjusted under different heat loads, and a suction force of the capillary core is adjusted to prevent a phase-change interface from stretching in the capillary core, and reduce heat transfer resistance during the working of the capillary core; and meanwhile, flowing resistance can be reduced, so that the running performance of the loop heat pipe is improved.

Description

technical field [0001] The invention relates to the field of porous medium phase change and flow technology, more specifically, to a variable-aperture capillary core applied to a loop heat pipe system and a processing method thereof, and can also be applied to fields such as aviation 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 phase change of working fluid to transfer heat. It has the advantages of strong heat transfer capacity, 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 As shown: after the evaporator 6 is attached to the heating surface of the heat dissipation component and heated, the heat is introduced into the capillary wick 11 t...

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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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