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首页> 外文期刊>International Journal of Heat and Mass Transfer >Convective Condensation Of Vapor In The Presence Of A Non-condensable Gas Of High Concentration In Laminar Flow In A Vertical Pipe
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Convective Condensation Of Vapor In The Presence Of A Non-condensable Gas Of High Concentration In Laminar Flow In A Vertical Pipe

机译：垂直管层流中高浓度不可冷凝气体存在下的蒸汽对流冷凝

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摘要

The problem of laminar film condensation of vapor in the presence of high concentration non-condensable gas such as humid air flowing in a vertical pipe under laminar forced convection conditions is formulated theoretically. The vapor condensing at dew point temperature releases both sensible and latent heats and diffuses on to the surface of the pipe through a non-condensable gas film. Thus it is treated as combined heat and mass transfer problem governed by mass, momentum and energy balance equations for the vapor-gas mixture and diffusion equation for the vapor species. The flow of the falling condensate film is governed by the momentum and energy balance equations. The temperature at the gas-to-liquid interface, at which the condensation takes place, is estimated with the help of the heat balance and mass balance equations at the interface. The local and average values of the condensation Nus-selt number, condensate Reynolds number, gas-liquid interface temperature and pressure drop are estimated from the numerical results for different values of the system parameters at inlet, such as relative humidity, temperature of vapor-gas mixture, gas phase Reynolds number and total pressure. The gas phase convection Nusselt and Sherwood numbers are also computed from numerical results. The predictions of the present study are compared with the experimental data available in literature, and the agreement is found to be reasonably good. An implicit pressure correction method developed by the authors is used in solving the momentum balance equation for the gas phase.
机译：理论上提出了在层流强制对流条件下，在垂直管中流动的高浓度不可凝气体（例如湿空气）存在下，蒸汽的层流膜冷凝问题。在露点温度下冷凝的蒸气释放出显热和潜热，并通过不可冷凝的气体膜扩散到管道表面。因此，它被视为传热和传质的综合问题，受蒸汽-气体混合物的质量，动量和能量平衡方程式和蒸汽物质的扩散方程式控制。下降的冷凝膜的流动受动量和能量平衡方程支配。借助冷凝界面处的热量平衡和质量平衡方程，可以估算出发生冷凝的气液界面温度。根据入口处系统参数的不同值（例如相对湿度，蒸气温度）的数值结果，可以估算出冷凝Nus-selt数，冷凝物雷诺数，气液界面温度和压降的局部和平均值。混合气体，气相雷诺数和总压力。气相对流Nusselt和Sherwood数也从数值结果计算得出。将本研究的预测结果与文献中提供的实验数据进行比较，发现一致性相当好。作者开发的隐式压力校正方法用于求解气相的动量平衡方程。

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