水平管外蒸气轴向库特流动时的凝结换热

Condensation heat transfer of steam in Coutte flow outside horizontal tube

根据蒸气在管束间和套管环形流道内流动特性，建立了适应该种流动凝结换热的物理及数学模型；通过数值求解，得到了蒸气流速对液膜厚度的影响区域及其随雷诺数、雅可比数及普朗特数的变化关系。

Based on the characteristics of steam flowing in the duct along tubes sheet and in the annular tunnel of casing tube, a physical and mathematical model is built up to describe condensation heat transfer process of this flow pattern. By means of the numerical solution, the influence area of steam velocity on the thickness of condensation film as well as its relation with Re, Ja and Pr are presented. The results reveal that this flow pattern could enhance condensation heat transfer.