竖直矩形微槽内的特殊干涸与换热行为  

SPECIAL BEHAVIORS OF DRYOUT AND HEAT TRANSFER IN VERTICAL RECTANGULAR MICROGROOVES

作　　者：胡学功[1] 唐大伟[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100080

出　　处：《工程热物理学报》2007年第5期820-822,共3页Journal of Engineering Thermophysics

基　　金：国家高技术研究发展专项经费资助项目(No.2006AA05Z225)

摘　　要：利用宽视场体视显微镜、高速摄影仪以及CCD摄像系统对纯蒸发和沸腾换热情形下竖直矩形毛细微槽内液体的特殊干涸行为进行了观察,对液体沿微槽槽道方向的润湿高度进行了观察测量,并对液体沿微槽槽道方向的相变换热特性进行了实验研究。实验结果表明:竖直矩形毛细微槽群是一种高性能的相变换热强化表面,微槽中液体的蒸发与沸腾对干涸点高度的变化有着复杂的影响,热流密度和相变换热系数沿槽道方向的分布不均匀。Using a wide field stereo-microscope, a high-speed camera and a CCD video camera, liquid dryout behaviors and axial wetting height in vertical rectangular capillary microgrooves were observed and measured under the conditions of pure evaporation and boiling heat transfer. An experimental study of axial phase-change heat transfer characteristics in the microgrooves was conducted. The results show that the surface with vertical rectangular capillary microgrooves has a high performance of phase-change heat transfer. Evaporation and boiling heat transfer have complicated effects on wetting height. There exist nonuniform distributions of heat flux and phasechange heat transfer coefficient along the axial direction of the microgrooves.

关 键 词：体视显微镜 毛细微槽群 干涸 相变换热系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]