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Evaporation Heat Transfer of Falling Films on Horizontal Tube-Part 1, Analytical Study

机译：水平管上降膜的蒸发传热-第1部分，分析研究

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摘要

Evaporation heat transfer of a saturated falling film on a horizontal tube was studied analytically. For laminar flow, a model comprised of the developing, transitional, and developed regions is proposed. The boundary layer integral method was used to reach a closed-form solution. A third-order polynomial temperature profile was assumed in the developing region, and a linear profile in the developed region. Both profiles join smoothly in the transition region. From this analysis, the Nusselt number was presented as a function of film Reynolds number, Prandtl number, and dimensionless tube radius. A similar correlation was developed for turbulent flow using the eddy viscosity model, where the Nusselt number was obtained as a function bf film Reynolds number and Prandtl number.
机译：分析研究了水平管上饱和降膜的蒸发传热。对于层流，提出了一个由发育，过渡和发育区域组成的模型。边界层积分法用于得出封闭形式的解。在显影区域中假定了三次多项式温度曲线，在显影区域中假定了线性曲线。两个配置文件在过渡区域中均平滑连接。通过该分析，将努塞尔数表示为胶片雷诺数，普朗特数和无因次管半径的函数。使用涡流粘度模型开发了湍流相似的相关性，其中，努塞尔数是薄膜雷诺数和普朗特数的函数。

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