In many industrial units such as packing columns, falling film reactors, etc., the liquid phase is designed as a falling film. It is well known that the mass and heat transfer in laminar wavy film flows is significantly enhanced compared to flat films. The kinetic phenomena underlying the increase in mass and heat transfer are, however, still not fully understood. For an efficient design of falling film units, computational models that account for these enhanced transport mechanisms are of key importance. In this article, we present a reduced modeling approach based on a long‐wave approximation to the fluid dynamics of the film. Furthermore, we introduce a new two‐dimensional (2D) high‐resolution laser‐induced luminescence measurement technique. Both in the numerical simulation results and in the high‐resolution 2D‐concentration measurements obtained in the experiments we observe similar patterns of high concentrations locally, especially in the areas close to the wave hump. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2265–2276, 2018

中文翻译：

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关于波浪状下降膜中传质的简化建模

在许多工业装置中，例如填料塔，降膜反应器等，液相被设计为降膜。众所周知，与平膜相比，层状波浪膜流中的质量和热传递得到了显着增强。然而，仍然没有完全理解质量和热传递增加的动力学现象。对于降膜单元的高效设计，考虑这些增强的传输机制的计算模型至关重要。在本文中，我们提出了一种基于长波近似于薄膜流体动力学的简化建模方法。此外，我们介绍了一种新的二维（2D）高分辨率激光诱导发光测量技术。在数值模拟结果和在实验中获得的高分辨率2D浓度测量中，我们都在局部观察到类似的高浓度模式，尤其是在靠近波峰的区域。©2018美国化学工程师学会AIChE J，64：2265-2276，2018年