Variable parameter liquid-absorbing core ultra-thin heat pipe

Abstract

The invention provides a variable-parameter liquid absorption core ultrathin heat pipe. Small-bore and high-porosity structures (201) are adopted in the areas on the two sides, in the width direction, of a liquid absorption core (2). A large-bore and small-porosity structure (202) is adopted in the area in the middle, in the width direction, of the liquid absorption core (2). According to the small-bore and high-porosity structures (201) of the areas on the two sides of the liquid absorption core (2), when the heat pipe works, a gas-liquid interface area in the liquid absorption core can be enlarged, the flow of working media participating in the evaporation and condensation process is increased, and the capillary drive force of the area is improved; meanwhile, by means of the large-bore and small-porosity structure of the area in the middle, the amount of working medium liquid stored in the liquid absorption core is increased, the resistance for the working media flowing to the two sides of the liquid absorption core is lowered, and working medium liquid can be supplemented to the areas on the two sides more easily; and the circulating speed of gas-liquid working media is increased, and efficient running of the ultrathin heat pipe is achieved.

Description

technical field [0001] The invention belongs to the field of thermal control of spacecraft and relates to an ultra-thin heat pipe, in particular to an ultra-thin heat pipe with a variable parameter liquid-absorbing core. Background technique [0002] In the field of spacecraft thermal control, the sharp increase in the heat flux density of various stand-alone electronic chips and the decreasing effective heat dissipation space make ultra-thin heat pipes an ideal heat conduction element in such application backgrounds. At present, the mature products of thin and tiny heat pipes in the field of spacecraft thermal control include the 3mm-thick rectangular heat pipes of the 509th Institute of the Eighth Academy of Aerospace Science and Technology, which belong to the axial T-shaped channel heat pipe. With the gradual reduction of the effective installation area of ​​the heating stand-alone chip, for example, the heat dissipation gap of the power lithium battery is only 2mm, and ...

AI Technical Summary

Problems solved by technology

Due to the thickness restriction of the ultra-thin heat pipe, it is usually difficult to design a capillary liquid wick with excellent performance, resulting in cramped steam channels and liquid return channels in the heat pipe working medium circulation, and the effective space of the gas-liquid interface for the evaporation and condensation of the working medium It is greatly reduced, causing the main thermal resistance in the working process of the heat pipe, that is, the evaporation thermal resistance to rise rapidly

At the same time, the ultra-thin structure also restricts the reflux of condensed liquid, and the reflux liquid cannot be replenished to the evaporation place in time, making it difficult to efficiently complete the working medium circulation process

Therefore, the overall performance of the general ultra-thin heat pipe is relatively poor, which is manifested as relatively large thermal resistance, low heat transfer capacity, and it is easier to reach the working limit.

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