Numerical simulation of heat and mass transfer characteristics of finned tubes with wing under wet conditions
The condensation heat transfer model was established by using the principle of wall reaction,and the moist air flow and heat and mass transfer characteristics in the channels of plain finned tubes,rectangular wing finned tubes and bow wing finned tubes were simulated.The results show that when the inlet temperature of moist air is 328 K and the water vapor mass fraction is 11.2％,the heat transfer factors of rectangular wing finned tubes and bow wing finned tubes increase respectively by 24.9％-35.7％and 26.7％-36.4％,and the mass transfer factors increase respectively by 24.1％-35.4％and 25.9％-38.3％,but the flow resistance coefficients of the working fluid in the channel of rectangular wing finned tubes and bow wing finned tubes increase respectively by 19.4％-25.3％and 16.8％-22.9％.It is shown that both rectangular and bow wings can improve the heat and mass transfer characteristics of finned tubes,but also increase the drag loss.Through the analysis of comprehensive heat transfer performance evaluation factors,the evaluation factors of rectangular wing finned tubes and bow wing finned tubes are greater than 1,and their comprehensive heat transfer performance is better than that of plain finned tubes,and the comprehensive heat transfer performance of bow wing finned tubes is the best.
principle of wall reactionheat transfermass transferrectangular wing and bow wingcomprehensive heat transfer performance
国家科技期刊平台
NSTL
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