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首页> 外文期刊>International Journal of Heat Exchangers >Turbulent Mixed Convection Heat and Mass Exchanges in Evaporating Liquid Film Along a Vertical Tube
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Turbulent Mixed Convection Heat and Mass Exchanges in Evaporating Liquid Film Along a Vertical Tube

机译：垂直管中蒸发液膜中的湍流混合对流换热和传质

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摘要

A computational study is reported for analysing heat and mass exchanges in turbulent mixed convection tube flow of air and water vapour in the range of Reynolds number from 5000 to 2.10~4 within a long uniformly heated vertical tube in the presence of a turbulent falling film of water on the inside wall. A low Reynolds number κ～ε turbulence model of Launder and Sharma (1974) is used in the gas stream and a modified Van Driest mixing length model in the liquid film. A marching procedure is employed for solution of the governing equations in the two phases coupling via the gas-water interface. The effects of Reynolds number, inlet liquid temperature, wall heat flux and inlet liquid mass flow rate on the heat and mass exchanges are examined in detail. In this study two dominant mechanisms of heat transfer are identified. When the water is fed with relatively high temperature, the dominant heat removal mechanism is evaporation of water from the surface of the film. In contrast, when the water temperature at inlet is relatively low, the dominant mechanism is convective cooling by the falling film.
机译：据报道进行了计算研究，以分析在湍流降膜存在的情况下，在长且均匀加热的垂直管中，在雷诺数为5000至2.10〜4的湍流混合对流管中，空气和水蒸气的热和质量交换。内墙上的水。在气流中使用了Launder and Sharma（1974）的低雷诺数κ〜ε湍流模型，在液膜中使用了改进的Van Driest混合长度模型。采用行进程序求解通过气-水界面耦合的两相中的控制方程。详细研究了雷诺数，入口液体温度，壁热通量和入口液体质量流量对热交换和质量交换的影响。在这项研究中，确定了两种主要的传热机理。当给水提供相对较高的温度时，主要的除热机理是水从薄膜表面蒸发。相反，当入口处的水温较低时，主要机制是降膜对流冷却。

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