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Article: Computational fluid dynamics simulations of flow and concentration polarization in forward osmosis membrane systems

TitleComputational fluid dynamics simulations of flow and concentration polarization in forward osmosis membrane systems
Authors
KeywordsComputational Fluid Dynamics (Cfd)
Desalination
External Concentration Polarization
Forward Osmosis
Internal Concentration Polarization
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal Of Membrane Science, 2011, v. 379 n. 1-2, p. 488-495 How to Cite?
AbstractForward osmosis is an osmotically driven membrane separation process that relies on the utilization of a large osmotic pressure differential generated across a semi-permeable membrane. In recent years forward osmosis has shown great promise in the areas of wastewater treatment, seawater/brackish water desalination, and power generation. Previous analytical and experimental investigations have demonstrated how characteristics of typical asymmetric membranes, especially a porous support layer, influence the water flux performance in osmotically driven systems. In order to advance the understanding of membrane systems, models that can accurately encapsulate all significant physical processes occurring in the systems are required. The present study demonstrates a computational fluid dynamics (CFD) model capable of simulating forward osmosis systems with asymmetric membranes. The model is inspired by previously published CFD models for pressure-driven systems and the general analytical theory for flux modeling in asymmetric membranes. Simulations reveal a non-negligible external concentration polarization on the porous support, even when accounting for high cross-flow velocity and slip velocity at the porous surface. Results confirm that the common assumption of insignificant external concentration polarization on the porous surface of asymmetric membranes used in current semi-analytical approaches may not be generally valid in realistic systems under certain conditions; specifically in systems without mass-transfer promoting spacers and low cross-flow velocities. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/185403
ISSN
2015 Impact Factor: 5.557
2015 SCImago Journal Rankings: 2.042
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorGruber, MFen_US
dc.contributor.authorJohnson, CJen_US
dc.contributor.authorTang, CYen_US
dc.contributor.authorJensen, MHen_US
dc.contributor.authorYde, Len_US
dc.contributor.authorHélixNielsen, Cen_US
dc.date.accessioned2013-07-30T07:32:18Z-
dc.date.available2013-07-30T07:32:18Z-
dc.date.issued2011en_US
dc.identifier.citationJournal Of Membrane Science, 2011, v. 379 n. 1-2, p. 488-495en_US
dc.identifier.issn0376-7388en_US
dc.identifier.urihttp://hdl.handle.net/10722/185403-
dc.description.abstractForward osmosis is an osmotically driven membrane separation process that relies on the utilization of a large osmotic pressure differential generated across a semi-permeable membrane. In recent years forward osmosis has shown great promise in the areas of wastewater treatment, seawater/brackish water desalination, and power generation. Previous analytical and experimental investigations have demonstrated how characteristics of typical asymmetric membranes, especially a porous support layer, influence the water flux performance in osmotically driven systems. In order to advance the understanding of membrane systems, models that can accurately encapsulate all significant physical processes occurring in the systems are required. The present study demonstrates a computational fluid dynamics (CFD) model capable of simulating forward osmosis systems with asymmetric membranes. The model is inspired by previously published CFD models for pressure-driven systems and the general analytical theory for flux modeling in asymmetric membranes. Simulations reveal a non-negligible external concentration polarization on the porous support, even when accounting for high cross-flow velocity and slip velocity at the porous surface. Results confirm that the common assumption of insignificant external concentration polarization on the porous surface of asymmetric membranes used in current semi-analytical approaches may not be generally valid in realistic systems under certain conditions; specifically in systems without mass-transfer promoting spacers and low cross-flow velocities. © 2011 Elsevier B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memscien_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.subjectComputational Fluid Dynamics (Cfd)en_US
dc.subjectDesalinationen_US
dc.subjectExternal Concentration Polarizationen_US
dc.subjectForward Osmosisen_US
dc.subjectInternal Concentration Polarizationen_US
dc.titleComputational fluid dynamics simulations of flow and concentration polarization in forward osmosis membrane systemsen_US
dc.typeArticleen_US
dc.identifier.emailTang, CY: tangc@hku.hken_US
dc.identifier.authorityTang, CY=rp01765en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.memsci.2011.06.022en_US
dc.identifier.scopuseid_2-s2.0-79960621718en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79960621718&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume379en_US
dc.identifier.issue1-2en_US
dc.identifier.spage488en_US
dc.identifier.epage495en_US
dc.identifier.isiWOS:000294076700052-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridGruber, MF=36014765200en_US
dc.identifier.scopusauthoridJohnson, CJ=55730273500en_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US
dc.identifier.scopusauthoridJensen, MH=7401787416en_US
dc.identifier.scopusauthoridYde, L=6507055635en_US
dc.identifier.scopusauthoridHélixNielsen, C=36767484600en_US

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