Composite capillary core with differential thermal coefficients for loop heat pipe and preparation method of composite capillary core

Abstract

The invention relates to a composite capillary core with differential thermal coefficients for a loop heat pipe and a preparation method of the composite capillary core. A thermal coefficient of the composite capillary core close to an evaporator side of the loop heat pipe is higher than that of the composite capillary core close to a compensator liquid side of the loop heat pipe. The preparation method of the composite capillary core with differential thermal coefficients comprises the following steps of: selecting sintering material matrix metal powders with an infinite mutual solubility and preparing a powder mixture with different mass proportions; filling the mixed powder mixture with different mass proportions in a mould layer by layer; carrying out cold press moulding on the powder mixture after the powder mixture is filled in the mould to form the shape and size required by a capillary core; and at last, sintering the powder mixture to prepare the composite capillary core with differential thermal coefficients. Since the composite capillary core has differential thermal coefficients, the heat transfer performance of the loop heat pipe can be favorably improved and heat control requirements of the loop heat pipe with performances of large heat transfer power and long-distance transmission can be met; and the composite capillary core with differential thermal coefficients can be used for developing efficient loop heat pipes and can be applied to the fields such as aviation heat control and ground electronic equipment cooling and the like.

Description

technical field [0001] The invention relates to a composite capillary core with differential thermal conductivity for loop heat pipes and a preparation method thereof. Background technique [0002] Loop Heat Pipe (LHP for short) is a high-efficiency heat transfer device that uses the phase change heat of the working fluid to achieve heat transfer. The basic components of the loop heat pipe include evaporator, capillary core, compensator, steam pipeline, The working principle of the liquid pipeline and the condenser is as follows: After the heat load is applied to the outside of the evaporator, the working fluid near the outer surface of the capillary core on the evaporator side is first heated and evaporated into steam, then enters the condenser through the steam pipeline, releases heat and then condenses The subcooling becomes a liquid working medium, and then flows through the liquid pipeline to return to the compensator, and then the compensator supplies the liquid workin...

AI Technical Summary

Problems solved by technology

At present, the most widely used capillary core is a capillary core made of a single metal material or a non-metallic material, which is difficult to meet the above requirements.

For example, the capillary core prepared by sintering a single metal material has a high thermal conductivity as a whole, which is not conducive to reducing the occurrence of heat leakage; if the capillary core is made of non-metallic materials such as other fibers or flexible materials, it has a low thermal conductivity, but it is not conducive to reducing heat leakage. Loop heat pipes for heat transfer with high heat flux

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