SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 34 ›› Issue (6): 97-105.DOI: 10.1016/j.cjche.2020.09.014

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

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

Siyuan Chen, Tao Zhang, Li Lv, Yanxiao Chen, Shengwei Tang   

  1. Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • 收稿日期:2020-05-07 修回日期:2020-08-13 出版日期:2021-06-28 发布日期:2021-08-30
  • 通讯作者: Shengwei Tang
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (Grant No. 21576168).

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

Siyuan Chen, Tao Zhang, Li Lv, Yanxiao Chen, Shengwei Tang   

  1. Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • Received:2020-05-07 Revised:2020-08-13 Online:2021-06-28 Published:2021-08-30
  • Contact: Shengwei Tang
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant No. 21576168).

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.

关键词: Falling film, Wavy microchannel, CFD, Mass transfer

Abstract: 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.

Key words: Falling film, Wavy microchannel, CFD, Mass transfer