Experimental and CFD Studies on the Performance of Microfiltration Enhanced by a Turbulence Promoter
This paper reports experimental and computational fluid dynamics （CFD） studies on the performance of microfiltration enhanced by a helical screw insert. The experimental results show that the use of turbulence pro- moter can improve the permeate flux of membrane in the crossflow microfiltration of c...
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| Published in | Chinese journal of chemical engineering Vol. 20; no. 4; pp. 617 - 624 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.08.2012
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1004-9541 2210-321X |
| DOI | 10.1016/S1004-9541(11)60226-7 |
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| Summary: | This paper reports experimental and computational fluid dynamics （CFD） studies on the performance of microfiltration enhanced by a helical screw insert. The experimental results show that the use of turbulence pro- moter can improve the permeate flux of membrane in the crossflow microfiltration of calcium carbonate suspension, and flux improvement efficiency is strongly influenced by operation conditions. The energy consumption analysis indicates that the enhanced membrane system is more energy saving at higher feed concentrations. To explore the intrinsic mechanism of flux enhancement by a helical screw insert, three-dimensional CFD simulation of fluid flow was implemented. It reveals that hydrodynamic characteristics of fluid flow inside the channel are entirely changed by the turbulence promoter. The rotational flow pattern increases the scouring effect on the tube wall, reducing theparticle deposition on the membrane surface. The absence of stagnant regions and high wall shear stress are respon- sible for the enhanced filtration performance. No secondary flow is generated in the channel, owing to the streamline shape of helical screw insert, so that theenhanced perform, ance is achieved at relatively low energy consumption. |
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| Bibliography: | membrane fouling, flux enhancement, turbulence promoter, computational fluid dynamics 11-3270/TQ LIU Yuanfa , HE Gaohong,DUNG Luhui, DOU Hong JU Jia and LI Baojun 1 State Key Laboratory of Fine Chemicals, R＆D Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China 2 Department of Biological Engineering, University of Technology of Compiegne, Compiegne 60205, France This paper reports experimental and computational fluid dynamics （CFD） studies on the performance of microfiltration enhanced by a helical screw insert. The experimental results show that the use of turbulence pro- moter can improve the permeate flux of membrane in the crossflow microfiltration of calcium carbonate suspension, and flux improvement efficiency is strongly influenced by operation conditions. The energy consumption analysis indicates that the enhanced membrane system is more energy saving at higher feed concentrations. To explore the intrinsic mechanism of flux enhancement by a helical screw insert, three-dimensional CFD simulation of fluid flow was implemented. It reveals that hydrodynamic characteristics of fluid flow inside the channel are entirely changed by the turbulence promoter. The rotational flow pattern increases the scouring effect on the tube wall, reducing theparticle deposition on the membrane surface. The absence of stagnant regions and high wall shear stress are respon- sible for the enhanced filtration performance. No secondary flow is generated in the channel, owing to the streamline shape of helical screw insert, so that theenhanced perform, ance is achieved at relatively low energy consumption. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1004-9541 2210-321X |
| DOI: | 10.1016/S1004-9541(11)60226-7 |