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含不凝性气体冷凝对流换热过程是核能及其它能源领域中的重要物理现象。目前对含不凝性气体冷凝对流换热的研究多局限于实验方法,且实验结果差别较大。本文用数值计算方法模拟了管内含不凝性气体冷凝对流换热过程,并与实验结果进行了对比,误差约为30%～40%。对对流传热传质过程的数值分析表明,纯对流换热约占总换热量的15%,冷凝换热约占总换热量的85%。由于壁面凝结的抽吸作用,在壁面附近产生了垂直于壁面的速度分量,使对流换热增强约100%～200%。
Non-condensable gases Condensing Convection Heat transfer is an important physical phenomenon in nuclear energy and other energy fields. At present, the research on the condensation and convection heat transfer of noncondensable gas is mostly limited to the experimental method, and the experimental results vary greatly. In this paper, numerical simulation is used to simulate the convective heat transfer of non-condensable gas in the tube. Compared with the experimental results, the error is about 30% -40%. The numerical analysis of the convective heat and mass transfer process shows that pure convective heat transfer accounts for about 15% of the total heat exchange and condensation heat transfer accounts for about 85% of the total heat transfer. Due to the condensation of the wall, the velocity component perpendicular to the wall is generated in the vicinity of the wall to enhance the convective heat transfer by about 100% to 200%.