水平微细圆管内膜状凝结换热特性的研究  

INVESTIGATION ON FILM CONDENSATION HEAT TRANSFER CHARACTERISTICS IN HORIZONTAL MICRO/MINI TUBES

作　　者：安刚[1] 李俊明[1] 张会勇[1] 王补宣[1] 

机构地区：[1]清华大学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》2006年第4期652-654,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50276030)

摘　　要：实验研究了微细圆管内凝结换热特性,实验中采用四种不锈钢管,其内径范围为289-997μm。基于实验结果, 分析了换热温差、蒸汽进口雷诺数Rein和管径对管内膜状凝结换热系数的影响,发现温差对管内膜状凝结换热的影响很小, Nu随蒸汽进口雷诺数Rein增加而增大,随管径减小而降低,而对流换热系数随管径减小而显著增大。The heat transfer characteristics of film condensation in ainless steel micro/mini tubes with inside diameters 289-997μm was investigated experimentally. Based on the experimental results, the effect of temperature difference, inlet Re number and tube diameter on heat transfer was analyzed. The experimental results indicated that the effect of temperature difference on heat transfer can be ignored, the average Nu number increases with increasing Rein, and decreases with decreasing tube diameter, while the local average heat transfer coefficient increases obviously with decreasing tube diameter.

关 键 词：微细圆管 膜状凝结 换热 影响因素 

分 类 号：TK124[动力工程及工程热物理—工程热物理]