喷淋高度对氨喷雾相变冷却特性的影响  

EFFECTS OF SPRAY DISTANCE ON SPRAY COOLING WITH AMMONIA

作　　者：孙少鹏[1] 王宏[1] 朱恂[1] 汪舒平[1] 余勇胜[1] 廖强[1] 石泳[1] 

机构地区：[1]重庆大学工程物理研究所,重庆400030

出　　处：《工程热物理学报》2010年第4期675-678,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50906102)

摘　　要：喷雾相变冷却具有高热流密度的换热能力,本文通过建立喷雾相变冷却实验系统,以液氨为工质,使用单喷嘴,对冷却面为2.5 cm×1.2 cm的热沉进行了实验研究。结果表明:以氨为工质的喷雾相变冷却具有较高的换热能力;在热流密度达到400W/cm^2时,热沉表面的温度在15℃以下;在实验工况不变时,随喷嘴喷淋高度的降低,临界热流密度值(CHF)增大,最大换热系数可达95000 W/(m^2·K)。Spray cooling offers the ability to remove high heat fluxes.In this paper,experimental investigations on heat transfer in spray cooling with ammonia were conducted,using single pressure atomized nozzle in 2.5 cm×1.2 cm test surface.Results demonstrate that ammonia is one of the best working fluid in spray cooling.It is exhibited that the heat fluxes could exceed 400 W/cm^2 at the surface temperature of heat sink below 15°,and it is also shown that an increased CHF as the spray distance decreased.The maximum heat transfer coefficient values can reach up to 95000 W/（m^2·K）.

关 键 词：喷雾冷却 液氨 喷雾高度 表面温度 高热流密度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]