Two-dimensional gradient porosity composite capillary core and preparation method thereof

Abstract

The invention relates to a novel two-dimensional gradient porosity composite capillary core, and belongs to the technical field of heat pipes. The novel two-dimensional gradient porosity composite capillary core comprises a porous layer m1, a porous layer m2, ... and a porous layer m which have the porosity gradient g1 in the x direction, and further comprises a porous layer n1, a porous layer n2,... and a porous layer n which have the porosity gradient g2 in the y direction, wherein m and n are natural numbers, m is greater than or equal to 2, n is greater than or equal to 2, and g1, g2, x and y can be set according to the needs. When the novel two-dimensional gradient porosity composite capillary core is prepared, a zoning gradient packing method is adopted, powder with the different particle sizes and different contents of pore forming agents are packed in a zoning mode, the different zones are partitioned by adopting thin partition plates, the partition plates are slowly pulled away before forming, and finally, the power of the capillary core can be controlled to be evenly distributed on the two specified dimensions. According to the novel two-dimensional gradient porosity composite capillary core, the porosity gradient with the certain gradient can be formed on the two dimensions according to the needs, the different function demands on the different direction dimensionsare met to the utmost extent, and the performance of the composite capillary core and even the whole heat pipe can be greatly improved.

Description

technical field [0001] The invention relates to a two-dimensional gradient composite capillary core and a preparation method thereof, belonging to the technical field of heat pipes. Background technique [0002] The heat pipe is a device that uses the principle of phase change to conduct efficient heat transfer. It has the advantages of small heat transfer temperature difference, high heat transfer performance, long-distance heat transfer and good temperature control characteristics. It is gradually being widely used in space and on the ground for various thermal control field. [0003] There are many types of new heat pipes, which can be divided into heat pipes with capillary cores (Wicked Heat Pipe) and heat pipes without capillary cores (Wickless Heat Pipe) from the perspective of whether there are capillary cores inside the heat pipes. For a heat pipe with a capillary core, the capillary core is a key component of the entire heat pipe, which provides the driving force f...

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Problems solved by technology

But these capillary wicks only have a pore gradient in one direction (take the capillary wick applied to a cylindrical evaporator as an example, and the capillary wick applied to a flat evaporator is the plane normal direction), although the number of layers may be more ( reach more than 3 layers), but after all, it is only one-dimensional gradient pores, and some are only suitable for loop heat pipes or capillary loop heat pipes

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