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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat and mass transfer analogy applied to condensation in the presence of noncondensable gases inside inclined tubes
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Heat and mass transfer analogy applied to condensation in the presence of noncondensable gases inside inclined tubes

机译：在倾斜管内存在不可冷凝气体的情况下，将热量和质量传递类比应用于冷凝

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摘要

A theoretical and experimental investigation on steam condensation in presence of noncondensable gases within horizontal and inclined tubes is summarized in the present paper. A simple correlation mainly based on dimensionless numbers was derived and compared with previous formulations based on the diffusion layer model. The noncondensable gases presence during condensation is an important issue affecting the whole thermodynamic efficiency of the process, and for this reason highly investigated by many researchers. The experimental data obtained for condensation, inside horizontal or inclined tube(15°, 30° and 45°)with an internal diameter of 22 mm, of an air/steam mixture, at low mixture Reynolds numbers(＜6000), have been used to verify the present heat and mass transfer analogy(HMTA)formulation. In order to perform the heat and mass transfer analogy, the suction effect at the interface has been taken into account since it considerably affects temperature and concentration profiles and hence the transfer coefficients. The model of Chato is used for the condensate boundary layer since it has been identified to be the better model under the experimental condition. Finally, the experimental data have been compared with the theoretical Couette flow model with transpiration showing a quite good agreement.
机译：本文总结了在水平管和倾斜管内不凝性气体存在下蒸汽凝结的理论和实验研究。得出了一个主要基于无量纲数的简单相关性，并将其与基于扩散层模型的先前公式进行了比较。冷凝过程中不可冷凝气体的存在是影响整个过程热力学效率的重要问题，因此许多研究人员对此进行了深入研究。使用低内径雷诺数（＜6000）的空气/蒸汽混合物在内径为22 mm的水平或倾斜管（15°，30°和45°）内部冷凝时获得的实验数据验证当前的传热和传质模拟（HMTA）公式。为了进行传热和传质的类比，考虑了界面处的吸力效应，因为它会显着影响温度和浓度曲线，进而影响传热系数。 Chato模型用于凝结水边界层，因为在实验条件下已经确定它是更好的模型。最后，将实验数据与理论Couette流动模型进行了比较，结果表明蒸腾作用非常吻合。

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