工质表面张力和黏度对脉动热管启动及传热热阻的影响  

Influence of surface tension and viscosity on the start-up time and thermal resistance of pulsating heat pipe

作　　者：郑开明[1] 徐荣吉[1] 王瑞祥[1] 邢美波[1] 蔡骥驰 苑亚 ZHENG Kaiming;XU Rongji;WANG Ruixiang;XING Meibo;CAI Jichi;YUAN Ya(Beijing Engineering Research Centre of Sustainable Energy and Buildings,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学北京市建筑能源高效综合利用工程技术研究中心,北京100044

出　　处：《化工进展》2017年第8期2816-2821,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金青年基金(51506004);北京市自然科学基金(3162009)项目

摘　　要：以表面活性剂全氟辛酸钾(potassium perfluorooctanoate,PFOK)为溶质,以纯水为基液,配制了质量分数为0.02%、0.05%、0.1%、0.2%、0.5%共5种溶液并进行了物性测试,发现PFOK对水的表面张力改变较大,黏度其次,比热容、密度、热导率等参数影响较小;实验研究了不同表面张力及黏度工质对内径为2.5mm的脉动热管在不同加热功率下的启动时间和传热热阻的变化规律。结果表明:加热功率对启动时间的促进作用在≤60W时较为明显;由于黏度增加的影响,表面张力对启动时间及传热热阻的变化规律都呈现W形图像;并且随着加热功率的增加,表面张力和黏度对传热热阻的影响作用下降。Thermo-physical properties of aqueous solutions of potassium perfluorooctanoate(PFOK),with mass fractions of0.02%,0.05%,0.1%,0.2%,0.5%,were tested respectively.It was found that significant changes in a little amount of PFOK could lead to surface tension of water,viscosityfollowed,while the specific heat,density,thermal conductivity and other parameters of water were less affected.An experimental study on characteristics of the pulsating heat pipe(PHP),with the inner diameter of2.5mm of copper pipe,using water of different surface tensions and viscosities was carried out.The results showed that promotion of heating power on startup time is obvious if the heating power input is no more than60W.Change laws of startup time and thermal resistance with the effect of surface tension present“W”type image due to the increment of viscosity.Besides,the effect of surface tension and viscosity on the thermal resistance is decreased with the increase of the heating power.

关 键 词：脉动热管 表面张力 黏度 启动时间 传热热阻 

分 类 号：TK172.4[动力工程及工程热物理—热能工程] TK124