The condensation heat transfer on the external surface of a vertical slender tube in the steam-air mixture environment was investigated. The condensation heat transfer was analyzed using various open experimental datasets. A new model for the steam condensation with noncondensable gases applicable to the tubular configuration was developed. The proposed model is based on the analogy between heat and mass transfer; in particular, the correlation incorporates the effects of tube curvature under turbulent free convection conditions together with the wavy film effect. In addition, the film-vapor interfacial temperature was used to calculate the heat transfer coefficient and various physical properties, through an iterative technique instead of the wall temperature, which is commonly used in experimental correlations for convenience. Thereafter, the effects of three correction factors were individually investigated. The wavy film effect considerably changed the condensation heat transfer, about 20% on average. The curvature effect was also found to make a meaningful effect according to the convection conditions. And, the adoption of interfacial temperature was found to make a maximum 7% adjustment, but it would make a more significant effect in high heat transfer conditions. Overall, the proposed model predicted the experimental datasets reasonably well, i.e., within ±30% accuracy.

研究了在蒸汽-空气混合物环境中垂直细长管的外表面上的冷凝传热。使用各种开放式实验数据集分析了凝结传热。开发了一种适用于管状结构的采用不凝性气体进行蒸汽凝结的新模型。所提出的模型基于传热和传质之间的类比。特别地，该相关性将湍流自由对流条件下的管曲率效应与波浪膜效应结合在一起。此外，薄膜-蒸汽界面温度通过迭代技术代替壁温来计算传热系数和各种物理性能，壁温是为了方便起见在实验相关中常用的方法。之后，分别研究了三个校正因子的影响。波浪状的薄膜效应极大地改变了冷凝传热，平均约为20％。根据对流条件，还发现曲率效应产生了有意义的效果。并且，发现采用界面温度最多可调节7％，但在高传热条件下效果会更显着。总体而言，所提出的模型可以很好地预测实验数据集，即准确度在±30％以内。发现采用界面温度最多可调节7％，但在高传热条件下效果会更显着。总体而言，所提出的模型可以很好地预测实验数据集，即准确度在±30％以内。发现采用界面温度最多可调节7％，但在高传热条件下效果会更显着。总体而言，所提出的模型可以很好地预测实验数据集，即准确度在±30％以内。