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首页> 外文期刊>Journal of Heat Transfer >Convective Condensation Of Vapor In Laminar Flow In A Vertical Parallel Plate Channel In The Presence Of A High- Concentration Noncondensable Gas
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Convective Condensation Of Vapor In Laminar Flow In A Vertical Parallel Plate Channel In The Presence Of A High- Concentration Noncondensable Gas

机译：存在高浓度不可冷凝气体的垂直平行平板通道中层流中蒸汽的对流冷凝

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摘要

The problem of laminar film condensation of a vapor from vapor-gas mixture in laminar flow in a vertical parallel plate channel is formulated theoretically. The flowing gas-vapor mixture contains a noncondensable gas in high concentration. An example of this case is the flow of humid air, in which air is present in high concentration. Vapor condenses at the dew point temperature corresponding to mass fraction of vapor in the gas-vapor mixture and the total pressure. The rate of condensation is controlled by the diffusion of the vapor through the noncondensable gas film. Thus the problem of convective condensation is treated as a combined problem of heat and mass transfer. The problem is governed by the mass, momentum and energy balance equations for the vapor-gas mixture flowing in a channel, and the diffusion equation for the vapor species. The flow of the falling film of condensate is governed by the momentum and energy balance equations for the condensate film. The boundary conditions for the gas phase and the condensate film are considered. The temperature at the gas-to-liquid interface is estimated by making use of the equations of heat and mass balance at the interface. The local condensation Nusselt number, condensation Reynolds number, and temperature at the gas-to-liquid interface are estimated from the numerical results for different values of the system parameters at the channel inlet, such as relative humidity, temperature of vapor-gas mixture, gas phase Reynolds number, and total pressure. The condensation heat transfer coefficients computed from the present theory are compared with the experimental data available in literature, and the agreement is found to be good. The present work is an extension of the earlier work, in which the problem of in-duct condensation of humid air in turbulent flow was solved theoretically. Humid air is considered as the gas-vapor mixture, since various physical and thermal properties have to be specified during the analysis.
机译：理论上提出了在垂直平行板通道中以层流形式流动的蒸气混合物中的蒸气的层状膜冷凝问题。流动的气体-蒸汽混合物包含高浓度的不可冷凝气体。这种情况的一个例子是湿空气的流动，其中空气以高浓度存在。蒸气在露点温度冷凝，该露点温度对应于气体-蒸气混合物中蒸气的质量分数和总压力。通过蒸气通过不可凝气体膜的扩散来控制凝结速率。因此，对流冷凝问题被视为传热和传质的综合问题。该问题由通道中流动的蒸气-气体混合物的质量，动量和能量平衡方程式以及蒸气物质的扩散方程式控制。冷凝液降膜的流量受冷凝液膜的动量和能量平衡方程支配。考虑气相和冷凝膜的边界条件。气-液界面处的温度通过利用界面处的热量和质量平衡方程来估算。根据通道入口处系统参数的不同值（例如相对湿度，蒸气-气体混合物的温度）的数值结果，可以估算出局部凝结努塞尔数，凝结雷诺数和气液界面温度。气相雷诺数和总压力。将本理论计算出的冷凝水传热系数与文献中的实验数据进行比较，发现吻合良好。当前的工作是对先前工作的扩展，其中理论上解决了湿空气在湍流中的管道内凝结问题。湿空气被视为气体-蒸汽混合物，因为在分析过程中必须指定各种物理和热特性。

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