Numerical simulation of mass transfer during gas injected air gap membrane distillation

被引：0
|
作者：
Li H. [1 ]
Pan Y.-Q. [1 ]
Yu L. [1 ]
He D.-M. [1 ]
机构：
[1] School of Chemical Engineering, Dalian University of Technology, Dalian
来源：
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2019年 / 33卷 / 04期
关键词：
Conputational fluid dynamic (CFD); Mass transfer coefficient; Membrane distillation; Process enhancement; Two-phase flow;
D O I：
10.3969/j.issn.1003-9015.2019.04.007
中图分类号：
学科分类号：
摘要：
Numerical simulation of mass transfer during gas injected air gap membrane distillation was studied by computational fluid dynamic (CFD) and the intensification mechanism was discussed. Gas-liquid two-phase flow in membrane tubes was used as the object and simulation was performed with FLUENT software based on volume of fluid (VOF) model. Sodium chloride aqueous solution was employed as the separation medium and nitrogen gas as the intensifying medium. The results show that the simulated permeation flux data are consistent with the experimental data. Gas injection is beneficial to membrane distillation processes, which can increase permeation flux(J) and mass transfer coefficient (k), and decrease concentration polarization coefficient (CPC). Simulated sodium chloride concentration distribution can be used to predict local concentration polarization effects. According to the mass transfer coefficient correlations, the Knudsen-Molecular diffusion-Poiseuille flow transition mechanism is better matched with the real mass transfer process than Knudsen-molecular diffusion mechanism. Affecting factors (i.e. gas holdup) of intensification can be studied by reasonable modeling and setting of simulation parameters. This method can also be applied to study enhanced membrane distillation mass transfer processes with multi-factors. © 2019, Editorial Board of "Journal of Chemical Engineering of Chinese Universities". All right reserved.
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页码：824 / 831
页数：7
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