A novel element for gas–liquid contact, a plate with rectangular windows was designed to enhance absorption process. Coexistence and interaction of wall-bounded films and confined free films named as “twin-liquid films” were observed on the plate. Volume of fluid (VOF) method was used to simulate its flow behavior. Flow phenomena such as flow around a step-in, jet impingement, varicose waves, and sinuous waves were observed. Different from thin films flow on an unperforated plate, larger mean velocity, thinner film thickness, more intensive capillary waves, and stronger vorticity on the free surfaces were detected inside the window, and the disturbances could propagate over the whole plate. Three-dimensional simulation results generally agreed with our experimental observations and further demonstrated complex wavy structures both inside and outside the window. The results would broaden traditional knowledge of liquid films flow and clarify the mechanism of mass transfer intensification for the plate with windows. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

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开窗垂直板上双液膜流动行为的数值模拟

一种用于气液接触的新型元件，带有矩形窗口的板被设计来增强吸收过程。在板上观察到壁结合膜和被称为“双液膜”的受限自由膜的共存和相互作用。流体体积（VOF）方法用于模拟其流动行为。观察到流动现象，如绕入式流动，射流撞击，静脉曲张和正弦波。不同于在无孔板上流动的薄膜，在窗口内部检测到更大的平均速度，更薄的膜厚，更强烈的毛细波以及自由表面上的涡旋，并且扰动可能在整个板上传播。三维模拟结果总体上与我们的实验观察结果一致，并进一步证明了窗户内部和外部的复杂波浪结构。结果将拓宽传统的液膜流动知识，并阐明带窗板的传质强化机理。©2017美国化学工程师学会AIChE的Ĵ，2017年