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首页> 外文期刊>International Journal of Heat Exchangers >Boundary layer analysis for steam condensation in a vertical tube with noncondensable gases
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Boundary layer analysis for steam condensation in a vertical tube with noncondensable gases

机译：带有不凝性气体的垂直管中蒸汽凝结的边界层分析

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摘要

The annular filmwise condensation of vapors in a vertical tube with noncondensable gases is examined. Full set of the boundary layer governing equations for the liquid film and steam-gas mixture regions are solved by the numerical method. For the turbulent model in the gas mixture region, various simple algebraic models are used and the results are compared with experimental data. The effects of suction on van Driest type damping factor are investigated. Boundary layer thickness and dimensionless profiles for axial velocity, temperature and noncondensable gas mass fraction are investigated. Results show that Reichardt turbulent model is better than Prandtl mixing length type model. Dimensionless profiles in the boundary layer for axial velocity, temperature and noncondensable gas mass fraction are very similar. Condensation heat transfer coefficients for various experimental data are compared and the agreement between the analysis results and data is satisfactory.
机译：检查了垂直管中蒸汽与不可凝气体的环形薄膜状冷凝。通过数值方法求解了液膜和蒸汽-气体混合物区域的边界层控制方程的全套。对于混合气体区域中的湍流模型，使用了各种简单的代数模型，并将结果与​​实验数据进行了比较。研究了吸力对van Driest型阻尼系数的影响。研究了轴向速度，温度和不可凝气体质量分数的边界层厚度和无量纲分布。结果表明，Reichardt湍流模型优于Prandtl混合长度类型模型。边界层中轴向速度，温度和不可凝气体质量分数的无因次分布非常相似。比较了各种实验数据的凝结传热系数，分析结果与数据吻合良好。

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