环路热管吸液芯毛细抽吸特性研究  

CAPILLARY PUMPING CHARACTERISTICS OF POROUS WICK FOR LOOP HEAT PIPE

作　　者：李金旺[1] 邹勇[1] 赵亮[1] 程林[1] 

机构地区：[1]山东大学热科学与工程研究中心,山东济南250061

出　　处：《工程热物理学报》2010年第5期839-841,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划项目(No.2007CB206900)

摘　　要：采用计算机记录毛细抽吸量实时变化曲线的方法,研究了环路热管吸液芯对不同工质的毛细抽吸特性,结果表明所有的吸液芯毛细抽吸过程均可分阶段采用玻耳兹曼方程进行描述,其误差在启动阶段和稳健抽吸阶段分别在5%和1%以内。工质的表面张力越大、密度越大,吸液芯的毛细抽吸量就越大;工质的表面张力越大、黏度越小,毛细抽吸速度越大。对孔隙率为45%～56%的吸液芯进行毛细抽吸实验发现,随着孔隙率的增大,抽吸速度和毛细抽吸量均随之增大,可见适当提高吸液芯的孔隙率有助于提高环路热管的性能。The capillary pumping characteristics of porous wicks with different working fluids for loop heat pipe are investigated by analyzing the real-time capillary pumping amount changing curve recorded by computer.The result shows that a typical capillary pumping process of porous wicks can be described in three periods with Boltzmann equations,and the error is less than 5%and 1%in the first two periods named startup period and stable pumping period respectively.Capillary pumping amount increases with the increase of surface tension coefficient and density.Capillary pumping speed increases when surface tension coefficient increases or viscosity decreases.As to the capillary pumping property of porous wicks with porosity ranges from 45%to 56%,both the capillary pumping speed and the capillary pumping amount increase with the increase of porosity,that is to say,bigger porosity is better for improving the performance of loop heat pipe.

关 键 词：毛细抽吸特性 吸液芯 玻耳兹曼方程 工质 孔隙率 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]