混合气体横向冲刷水平管时对流冷凝换热的机理研究  

Mechanism research of convective condensation heat transfer for mixture gas flowing over horizontal tube

作　　者：贾力[1] 吴冬梅[1] 齐巍[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《热科学与技术》2007年第3期209-213,共5页Journal of Thermal Science and Technology

摘　　要：采用修正的膜模型与Nusselt凝结理论相结合的方法,对含湿混合气体以一定速度冲刷水平管外时对流冷凝换热进行研究,在考虑气相边界层分离的情况下讨论了液膜流动和换热的情况,同时研究了气体来流冲刷角度对总体换热的影响。结果表明,冷凝液膜是一个相当薄的膜层,液相导热热阻在整个换热的过程中基本可以忽略。The modified film model was combined with the Nusselt＇s condensation theory for the study of the convective condensation heat transfer on a horizontal tube across which moist mixed gas flows horizontally at a certain speed. A theoretical model with gas boundary layer separation was developed for the study of the liquid film flows and the heat transfers on the tube. The effects of flowing direction on condensation heat transfer were discussed. Results predict that the condensate is so thin that the liquid phase heat resistance can be ignored.

关 键 词：混合气体 凝结换热 水平单管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]