环路热管复合毛细芯的孔结构优化与性能研究  

Pore Structure Optimization and Properties of Composite Wicks for Loop Heat Pipes

作　　者：徐计元[1] 邹勇[1] 程林[1] 

机构地区：[1]山东大学,山东省济南市250061

出　　处：《中国电机工程学报》2012年第23期70-74,152,共5页Proceedings of the CSEE

基　　金：山东省中青年科学家科研奖励基金(BS2009CL052)~~

摘　　要：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。The thermal conductivity and the holistic capillary pumping performance of two-layer composite wicks were investigated, in which the composite wicks with optimal arrangement of pore characteristics were fabricated using pore-forming agents with different particle size. Results show that salt-leaching pore forming method is available to fabricate composite wicks with adjustable pore characteristics. With the same porosity, the thermal conductivity of the wicks reduces with decreasing the mean pore size and centralizing the pore size distributions. Thermal conductivity arrangement of the wicks can be realized by controlling the pore characteristics of the inner layer and outer layer. The holistic capillary pumping performance of two-layer composite wicks, which is between that of the single-layer wicks, is mainly depended on the pore characteristic of the inner layer. Considering the arrangement of thermal conductivity, the holistic capillary pumping performance and the vapor permeability, the composite wicks with fine pores in the inner layer and large pores in the outer layer show the best overall performance.

关 键 词：环路热管 复合毛细芯 导热系数 毛细抽吸性能 造孔剂 

分 类 号：TF125[冶金工程—粉末冶金] TK172.4[冶金工程—冶金物理化学]