铜泡沫冲击射流换热及流动可视化研究  

Heat Transfer and Flow Visualization Experiments of Copper Foam Under Impinging Jet

作　　者：邝九杰[1,2] 冯上升 金东范[2] 卢天健[2,3] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]多功能材料和结构教育部重点实验室,西安710049 [3]西安交通大学机械结构强度与振动国家重点实验室,西安710049

出　　处：《工程热物理学报》2015年第9期2014-2017,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51206128);国家重点基础研究发展规划资助项目(No.2011CB610305);国家"111"引智计划资助项目(No.B06024);中国博士后基金资助项目(No.2012M521766);中央高校基本科研业务费专项资金资助项目;陕西省博士后科研项目

摘　　要：本文实验研究了圆管冲击射流下通孔金属泡沫的流动换热特性,测量了10 PPI和30 PPI铜泡沫的平均努塞尔数Nu_(avg),同时采用烟线法得到冲击射流下铜泡沫的流场可视化图像。结果表明:在较高雷诺数下,存在最优冲击距离使铜泡沫的换热性能最优;在低雷诺数下,通孔铜泡沫的换热性能受冲击距离的影响较小。孔密度为10 PPI的铜泡沫较30 PPI铜泡沫的换热性能提高了约30%。通过流动可视化解释了铜泡沫的换热性能随冲击距离和PPI变化现象。This paper presents an experimental study on open-celled copper foam under circular impinging jet. Thermal performance of 10 PPI and 30 PPI copper foam were measured in terms of the average Nusselt number. The smoke wire technique was employed to obtain the impinging flow characteristics over metal foam. Experimental results showed that, under a higher Reynolds number an optimum impinging distance exists to provide the best heat transfer performance, while under a lower Reynolds number the effects of impinging distance on the heat transfer performance can be neglected. 10 PPI copper foam displays 30% higher thermal performance than that of the 30 PPI foam. The flow images can be used to explain the heat transfer behavior of metal foam.

关 键 词：金属泡沫 圆管冲击射流 烟线法 换热 流场可视化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]