Simulation of the hydrodynamics and mass transfer in a falling film wavy microchannel

被引：16
作者：
Chen, Siyuan [1 ]
Zhang, Tao [1 ]
Lv, Li [1 ]
Chen, Yanxiao [1 ]
Tang, Shengwei [1 ]
机构：
[1] Sichuan Univ, Sch Chem Engn, Low Carbon Technol & Chem React Engn Lab, Chengdu 610065, Peoples R China
来源：
CHINESE JOURNAL OF CHEMICAL ENGINEERING | 2021年 / 34卷 / 34期
基金：
中国国家自然科学基金;
关键词：
Falling film; Wavy microchannel; CFD; Mass transfer; ELEMENTAL FLUORINE; LIQUID-FILM; MICROSTRUCTURED REACTOR; CFD SIMULATION; THIN-FILM; FLOW; MICROREACTOR; CORRUGATIONS; TRANSPORT; DYNAMICS;
D O I：
10.1016/j.cjche.2020.09.014
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The flow in a liquid falling film is predominantly laminar, and the liquid-side mass transfer is limited by molecular diffusion. The effective way to enhance the mass transfer is to improve the liquid film flow behavior. The falling film behaviors of water, ethanol and ethylene glycol in nine different wavy microchannels were simulated by Computational Fluid Dynamics. The simulation results show that the falling film thickness exhibits a waveform distribution resulting in a resonance phenomenon along the wavy microchannel. The fluctuation of liquid film surface increases the gas-liquid interface area, and the internal eddy flow inside the liquid film also improves the turbulence of liquid film, the gas-liquid mass transfer in falling film microchannels is intensified. Compared with flat microchannel, the CO2 absorption efficiency in water in the wavy microchannel is improved over 41%. Prediction models of liquid film amplitude and average liquid film thickness were established respectively. (C) 2020 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.
引用
收藏
页码：97 / 105
页数：9
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