R141b在矩形微尺度通道中的两相流传热特性  

Two-phase heat transfer characteristics of R141b in rectangular micro-channels

作　　者：张宗卫[1] 郑东生 张盛辉 杨祺 黄树椿 ZHANG Zongwei;ZHENG Dongsheng;ZHANG Shenghui;YANG Qi;HUANG Shuchun(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Lanzhou Institute of Physics,China Academy of Space Technology,China Aerospace Science and Technology Corporation,Lanzhou 730000,China)

机构地区：[1]中国民航大学航空工程学院,天津300300 [2]北京航空航天大学能源与动力工程学院,北京100191 [3]中国航天科技集团公司中国空间技术研究院兰州空间技术物理研究所,兰州730000

出　　处：《航空动力学报》2018年第8期1793-1800,共8页Journal of Aerospace Power

基　　金：中央高校基本科研业务费中国民航大学专项(3122014C006);中国民航大学科研启动基金(2013QD11S)

摘　　要：设计搭建水力直径分别为1mm和0.5mm的矩形微尺度通道实验台,研究了以R141b型制冷剂作为工质的两相流沸腾传热特性。实验取热流密度为1~16kW/m^2、质量流速为111.1~333.3kg/(m^2·s)和质量干度为0~1,分析了三者对平均传热系数的影响,探究影响换热的主导因素。结果表明:热流密度较高时,平均传热系数随热流密度增加而减小,流动换热主要受到沸腾传热的影响;当质量流速较大且热流密度较低时,平均传热系数随热流密度增加而有所增长;热流密度较低时,平均传热系数随质量流速变化明显,热流密度升高到一定值后,质量流速对平均传热系数的影响很小;当质量流速处于111.1~333.3kg/(m^2·s)时,平均传热系数随质量干度的增加而减小。An experimental study of two-phase flow heat transfer characteristics in rectangular micro-channels of 1 mm and 0.5 mm hydraulic diameter was conducted.R141 bwas used as the working fluid.In this experiment,the heat flux ranged from 1 to 16 kW/m2,the mass flow rate ranges from 111.1 kg/（m2·s）to 333.3 kg/（m2·s）,and the mass vapor quality ranged from 0 to 1.In order to know the main factor affecting heat transfer,the relationships of average heat transfer coefficient between heat flux,mass flow rate and mass vapor quality were analyzed.Result showed that,when the heat flux was low,the averageheat transfer coefficient decreased as heat flux increase was affected by boiling heat transfer,and the opposite trend came when the mass flow rate became large.Under the condition of low heat flux,the average heat transfer coefficient changed obviously with the mass flow rate,and the mass flow rate had weak effect on the average heat transfer coefficient after the heat flux increased to a certain value.When the mass flow rate ranged from 111.1 kg/（m2·s）to 333.3 kg/（m2·s）,the average heat transfer coefficient decreased as mass vapor quality increased.

关 键 词：R141b型制冷剂 换热特性 矩形微尺度通道 两相流 平均传热系数 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]