Abstract: A numerical method is propose for studing the condensation mechanism of specially shaped fin tubes, which include the radially ridged fin tube(R. tube) and the saw-tooth shaped fin tube(S. T. Tube). The results show that the effects of surface tension and fin roughness differ with peripheral position, and can be related to the structural parameters of the tube, the properties of the condensate and the magnitude of the heat flux. In general, both surface tension and fin roughness play important roles in condensation heat transfer for the S. T. tube, while two-dimensional surface tension play a leading role for the R. tube.

摘要： 本文首次提出用数值方法从微观上研究异形翅片管强化冷凝传热的机理.揭示了:对于不同级构参数的异形翅片管、不同工质、在不同的热流率下、在管的不同周向位置上,表而张力作用和粗糙度促进对流传热作用的效果不同.总而言之,在中等热流率下,R管以二维表面张力作用为主,对于ST管,两者作用相当.