光滑表面与切槽表面喷雾冷却的实验研究  

SPRAY COOLING OF FLAT SURFACE AND ENHANCED SURFACES

作　　者：李佳[1] 张震[1] 姜培学[1] 雷树业[1] 

机构地区：[1]热科学与动力工程教育部重点实验室,清华大学热能工程系,北京100084

出　　处：《工程热物理学报》2010年第11期1889-1892,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学重点基金项目(No.50736003);973项目(No.2007CB210107)

摘　　要：本文通过改变喷雾的流量(压力)、喷射高度和喷射倾斜角对平板和切槽表面喷雾冷却进行了实验研究。实验用的强化表面是将表面切割出0.2mm高、0.2 mm宽的方形翅块。实验结果表明:流量、喷射高度均存在最优值,大的喷射倾角会削弱冷却性能;对比同样条件下的平板表面,切槽表面显著强化了喷雾冷却的性能,对流换热系数提高约30%。Spray cooling of enhanced surface was investigated experimentally for various spray parameters,such as the spray flow rate（pressure）,spray height and spray angle.The enhanced surface had an array of 0.2 mm tall by 0.2 mm wide square pin fins covering the enhanced surface.The results show optimal flat rate and jet heights to maximize the heat transfer,while larger jet inclination angles weaken the cooling.Compared with a flat surface,enhanced surface significantly improves the spray cooling heat transfer with the convective heat transfer coefficient increased by about 30%.

关 键 词：喷雾冷却 高热流密度 切槽表面 临界热流密度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]