CIESC Journal ›› 2018, Vol. 69 ›› Issue (11): 4655-4662.doi: 10.11949/j.issn.0438-1157.20180457

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CFD simulation of Dean vortex enhanced mass transfer in hollow fiber membrane pervaporation

WANG Yang1, ZHUANG Liwei1, MA Xiaohua1, XU Zhenliang1, WANG Zhi2   

  1. 1. State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R & D Laboratory, Chemical Engineering Research Center, East China University of Science and Technology, Shanghai 200237, China;
    2. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2018-05-02 Revised:2018-08-10 Online:2018-11-05 Published:2018-08-17
  • Supported by:

    supported by the National Natural Science Foundation of China (21706066, 2015BAB09B01) and the Consulting Project of Chinese Academy of Engineering(2017-XZ-08-04-02).

Abstract:

A three-dimensional CFD model of perforated vaporization mass transfer of hollow fiber membrane was established. The effect of Dean vortex on mass transfer in pervaporation process was studied. Concentration profiles and velocity distribution inside the membrane were determined and the mass transfer coefficient simulated by this model was validated by Leveque equation. The results showed that the mass transfer resistance of bounder layer in the curved membrane was influenced by Dean vortex, and the total mass transfer coefficient was improved 4 times over the straight membrane. The wall shear stress inside the curved membrane is larger than the straight membrane at different inlet velocity and concentration. When membrane resistance was much less than boundary layer resistance, inlet velocity was 0.275 m·s-1 and water concentration was 10%(mass), permeation flux in the curved membrane was 12636 g·m-2·h-1, which is 4 times higher than the one in straight membrane. It proved that the predicted data are consistent with Leveque equation, and the curved membrane has significant effect of mass transfer enhancement in pervaporation process.

Key words: membrane, pervaporation, mass transfer, Dean vortex, CFD

CLC Number: 

  • TP273

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