孔隙构型及表面处理对毛细芯性能的影响  

Effect of Pore Configuration and Surface Modification Treatment on Performance of Capillary Wicks

作　　者：毛浙寅 李金旺 陈琪 MAO Zheyin;LI Jinwang;CHEN Qi(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Key Laboratory of Aero-engine Thermal Environment and Structure,Ministry of Industry and Information Technology,Nanjing 211016,China)

机构地区：[1]南京航空航天大学航天学院,南京211106 [2]航空发动机热环境与热结构工信部重点实验室,南京211106

出　　处：《工程热物理学报》2025年第2期564-574,共11页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.11802125,No.52276155);航空发动机热环境与热结构工信部重点实验室开放基金(No.CEPE2022003)。

摘　　要：毛细芯是热管的核心部件,对热管的性能有着重要的影响。本文结合平行槽道毛细芯和金属丝网毛细芯的特点,设计不同构型、不同孔隙大小的毛细芯,采用3D打印的方法制备了试样,通过实验研究了毛细芯的导热性能以及对毛细芯进行亲水改性表面处理前后的毛细抽吸性能,研究结果表明:矩形与三角形截面等非圆孔隙截面毛细芯可以获得更低的摩擦系数。毛细芯有效导热系数随温度的上升先增大后减小,并随孔隙率的增大而减小。毛细抽吸性能试验中初始抽吸速度随孔隙的增大而增大,圆形截面孔隙毛细芯的毛细抽吸性能参数最好,三角形截面孔隙毛细芯的毛细抽吸性能最差。经表面改性处理后毛细芯的性能得到提升,改性后以去离子水为工质的毛细抽吸性能提升180%~285%,以无水乙醇为工质的毛细抽吸性能提升108%~119%。Capillary wick is the core component of heat pipe,which has important influence on the performance of heat pipe.In this paper,combined with the characteristics of parallel channel capillary wick and wire mesh capillary wick,different structure and different pore sizes of capillary wick were designed and samples were prepared by 3D printed method.Through experiments,the thermal conductivity and capillary performance of capillary wick and the influence of hydrophilic modified surface treatment were studied.The research results show that:the capillary wicks with non-circular sections such as rectangular and triangular sections can obtain lower friction coefficients.The effective thermal conductivity of capillary wick firstly increases and then decreases with the increase of temperature,and decreases with the increase of capillary wick porosity.The initial capillary pumping velocity increases with the pore size increase.The capillary performance of capillary wicks with circular section are the best and capillary wicks with triangular section are the worst.The performance of the modified capillary wick is improved.The performance of the modified capillary wicks with deionized water as the working medium are increased by 180%~285%,and the performance of the modified capillary wicks with anhydrous ethanol as the working medium are increased by 108%~119%.

关 键 词：毛细芯 不同构型 有效热导率 毛细抽吸性能 表面改性处理 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]