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采用不同粒度的造孔剂制备了孔隙特性优化布置的环路热管双层复合结构毛细芯。研究了复合结构毛细芯的导热系数及其整体毛细抽吸性能。实验结果表明:孔隙率相同的情况下,毛细芯的导热系数随着平均孔径的降低及孔径分布的集中而降低。通过控制复合结构毛细芯内外层的孔隙特性可调节毛细芯的整体导热系数分布。双层复合结构毛细芯的整体毛细抽吸性能介于相应单层毛细芯的抽吸性能之间,其整体毛细抽吸性能主要取决于内层的孔隙特性。考虑到复合毛细芯的导热系数布置、整体毛细抽吸性能和气体渗透率等因素,采用内层小孔径而外层孔径较大的复合毛细芯结构可实现环路热管毛细芯整体性能的优化。
Apertured heat pipe double - layer composite wick with optimized pore structure was prepared by using pore - forming agent of different particle size. The thermal conductivity and overall capillary suction performance of capillary wick with composite structure were studied. The experimental results show that with the same porosity, the thermal conductivity decreases with the decrease of average pore size and the distribution of pore size. The overall thermal conductivity distribution of capillary wick can be adjusted by controlling the pore characteristics of the inner and outer layers of wick. The overall capillary suction performance of the wick with double-layer composite structure is between the suction performance of the corresponding single-layer capillary wick. The overall capillary suction performance depends on the pore characteristics of the inner layer. Considering the thermal conductivity of the composite capillary core, the overall capillary suction performance and the gas permeability, the overall performance of the capillary loop of the loop heat pipe can be optimized by using composite capillary core structure with small inner diameter and large outer diameter.