摘要
Condensation of humid air along a vertical plate was numerically investigated, with the mathematical model built on the full boundary layer equations and the film-wise condensation assumption. The velocity, heat and mass transfer characteristics at the gas-liquid interface were numerical analyzed and the results indicated that it was not reasonable to neglect the condensate film from the point of its thickness only. The condensate film thickness, interface temperature drop and the interface tangential velocity affect the physical fields weakly. However, the subcooling and the interface normal velocity were important factors to be considered before the simplification was made. For higher wall temperature, the advective mass transfer contributed much to the total mass transfer. Therefore, the boundary conditions were the key to judge the rationality of neglecting the condensate film for numerical solutions. The numerical results were checked by comparing with experiments and correlations.
沿着一个垂直盘子的潮湿的空气的冷凝作用数字地被调查，与在完整的边界层方程和电影明智的冷凝作用假设上造的数学模型一起。在煤气液体的接口的速度，热和集体转移特征是数字的分析，结果显示仅仅从它的厚度的点忽视冷凝物电影不是合理的。冷凝物电影厚度，接口温度落下和接口正切的速度微弱地影响物理地。然而，在简化被做以前，使过冷和接口正常速度是要考虑的重要因素。为更高的墙温度，移流的集体转移贡献了大部分到全部的集体转移。因此，边界条件是钥匙判定为数字答案忽视冷凝物电影的合理性。数字结果被与实验和关联作比较检查。
基金
Supported by the National Basic Research Program of China （2011CB706904） and Beijing Natural Science Foundation （3071001）
