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Article: Network modeling for studying the effect of support structure on internal concentration polarization during forward osmosis: Model development and theoretical analysis with FEM

TitleNetwork modeling for studying the effect of support structure on internal concentration polarization during forward osmosis: Model development and theoretical analysis with FEM
Authors
KeywordsFinite Element Analysis
Forward Osmosis
Internal Concentration Polarization
Network Modeling
Support Structure
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. 307-321 How to Cite?
AbstractThere is growing interest in the use of forward osmosis (FO) for desalination and water reclamation. A critical problem limiting the application of the forward osmosis process is the concentration polarization within the porous support structure. The classical models usually describe the internal concentration polarization based on the assumption that the support layer could be approximated by a linear structure while the intricate morphology is lumped into the macroscopic phenomenological coefficients. Here, we propose a novel approach to study the effect of the porous support structure on the internal concentration polarization with more degrees of freedom. The support layer is approximated by a well-defined network, which provides a spatial domain of the topological structure for numerically evaluating the convective diffusion in the porous media associated with the finite element analysis. An analytical solution based on the effective network is then obtained, and the involved dimensionless groups have physical meanings indicating the relative importance of the transport mechanisms. The FO membrane performances at steady state are statistically correlated to the distinct network substructures, which are generated by controlling the blockage probability in each coordinate direction. The transportation systems for both the bulk fluid and solute in different networks are visualized based on their relative activity, and reveal that the dispersive transport of the solute has significant impact on the macroscopic structural parameters. The transient processes of FO are also quantitatively investigated in conjunction with the networks having the typical support structures. The simulation results in this work provide deeper insights into the interplay between the subtle support structures and the polarization phenomena, and the developed mathematical models offer a useful tool of optimizing the support structure for enhanced forward osmosis efficiency. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/185404
ISSN
2015 Impact Factor: 5.557
2015 SCImago Journal Rankings: 2.042
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Wen_US
dc.contributor.authorGao, Yen_US
dc.contributor.authorTang, CYen_US
dc.date.accessioned2013-07-30T07:32:19Z-
dc.date.available2013-07-30T07:32:19Z-
dc.date.issued2011en_US
dc.identifier.citationJournal Of Membrane Science, 2011, v. 379 n. 1-2, p. 307-321en_US
dc.identifier.issn0376-7388en_US
dc.identifier.urihttp://hdl.handle.net/10722/185404-
dc.description.abstractThere is growing interest in the use of forward osmosis (FO) for desalination and water reclamation. A critical problem limiting the application of the forward osmosis process is the concentration polarization within the porous support structure. The classical models usually describe the internal concentration polarization based on the assumption that the support layer could be approximated by a linear structure while the intricate morphology is lumped into the macroscopic phenomenological coefficients. Here, we propose a novel approach to study the effect of the porous support structure on the internal concentration polarization with more degrees of freedom. The support layer is approximated by a well-defined network, which provides a spatial domain of the topological structure for numerically evaluating the convective diffusion in the porous media associated with the finite element analysis. An analytical solution based on the effective network is then obtained, and the involved dimensionless groups have physical meanings indicating the relative importance of the transport mechanisms. The FO membrane performances at steady state are statistically correlated to the distinct network substructures, which are generated by controlling the blockage probability in each coordinate direction. The transportation systems for both the bulk fluid and solute in different networks are visualized based on their relative activity, and reveal that the dispersive transport of the solute has significant impact on the macroscopic structural parameters. The transient processes of FO are also quantitatively investigated in conjunction with the networks having the typical support structures. The simulation results in this work provide deeper insights into the interplay between the subtle support structures and the polarization phenomena, and the developed mathematical models offer a useful tool of optimizing the support structure for enhanced forward osmosis efficiency. © 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.subjectFinite Element Analysisen_US
dc.subjectForward Osmosisen_US
dc.subjectInternal Concentration Polarizationen_US
dc.subjectNetwork Modelingen_US
dc.subjectSupport Structureen_US
dc.titleNetwork modeling for studying the effect of support structure on internal concentration polarization during forward osmosis: Model development and theoretical analysis with FEMen_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.2011.05.074en_US
dc.identifier.scopuseid_2-s2.0-79960644187en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79960644187&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume379en_US
dc.identifier.issue1-2en_US
dc.identifier.spage307en_US
dc.identifier.epage321en_US
dc.identifier.isiWOS:000294076700033-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLi, W=46661142300en_US
dc.identifier.scopusauthoridGao, Y=55143621800en_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US

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