Volume 5, Issue 1, March 2019, Page: 29-36
The Research of the Flow Characteristics in Spiral Membrane Separator
Zhou Xiantao, Institute of Chemical Machinery, East China University of Science and Technology, Shanghai, China
Liu Hui, Institute of Chemical Machinery, East China University of Science and Technology, Shanghai, China
Wan Xuhui, Institute of Chemical Machinery, East China University of Science and Technology, Shanghai, China
Received: Jan. 24, 2019;       Accepted: Mar. 17, 2019;       Published: Apr. 8, 2019
DOI: 10.11648/j.ajwse.20190501.15      View  166      Downloads  18
Abstract
The spiral membrane separator is a novel module proposed for reducing the concentration polarization and membrane fouling of membrane separation process. This membrane separation process benefits from dean vortices produced by centrifugal instability in enhancing fluid mass transfer. A numerical stimulation of this membrane separation is presented and used to analyze the fluid flow characteristics and thoroughly understand the separation mechanism. The numerical model consists of a spiral flow path with rectangular sector. As the simulation with infiltration, the fluid domain of the ceramic membrane tube was as a porous medium domain. The standard momentum equation, added with the momentum equation source term which composed of the viscosity loss term and the inertia loss term, are figured out through the experimental characterization. In the simulation of spiral membrane separation, the Dean secondary flow structure is identified and found to enhance fluid mass transfer and to increase the permeate flux. The critical unstable state of spiral membrane separation is accordingly De=246 without the flow permeation and De=863 with the permeation, where Dean vortices cause collisions and the mixing of fluid particles. Then in the case of permeation, the fluid in separator at De=1232 is numerically simulated to show that the higher flow velocity and a large fluctuating trend of wall shear stress near the membrane surface (inside), which mainly contributed to alleviate concentration polarization and membrane fouling.
Keywords
Membrane Separation, Secondary Flow, Numerical Simulation
To cite this article
Zhou Xiantao, Liu Hui, Wan Xuhui, The Research of the Flow Characteristics in Spiral Membrane Separator, American Journal of Water Science and Engineering. Vol. 5, No. 1, 2019, pp. 29-36. doi: 10.11648/j.ajwse.20190501.15
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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