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Analytical model for multicomponent wall film evaporation with non-unity Lewis number

机译：非团结lewis数的多组分壁膜蒸发分析模型

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Analytical expressions for the external heat flux from ambient to the wallfilm liquid-vapor interface and the phase change rates at the interface are derived from first principles using the governing equations. This is done in two models. The first assumes the unity Lewis number condition and the second, relaxes the unity Lewis number assumption with a simplifying assumption for the specific heat to obtain an analytical expression. A correction factor is obtained from these two models, which is used to derive the final expression. The model was coded into a computer program and applied to simulate transient evaporation of liquid wallfilms placed on the bottom wall of a square channel. Normal evaporation and flash boiling conditions were considered for various liquid composition of the wallfilms, including single component light (n-heptane, iso-octane) and heavy (tetradecane) alkanes and a multicomponent case of 50% n-heptane 50% iso-octane. Computation results for all these cases are presented and the phase change behavior simulated is discussed.
机译：从环境对壁液 - 蒸汽接口的外部热通量的分析表达和界面处的相变速率源自使用控制方程的第一原理。这是在两个模型中完成的。第一个假设Unity Lewis号码条件和第二，通过简化特定热量来获得统一的lewis数字假设以获得分析表达。从这两个模型获得校正因子，其用于导出最终表达式。该模型被编码为计算机程序，并应用于在方形通道底壁上模拟液体壁玻璃的瞬时蒸发。考虑正常蒸发和闪蒸沸点条件，用于壁式的各种液体组合物，包括单组分光（正庚烷，异辛烷）和重（四烷）烷烃和50％正庚烷50％异辛烷的多组分壳体。提出了所有这些情况的计算结果，并讨论了模拟的相变行为。

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