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Article: A unified model for quantification of concentration polarization (CP) of particles during cross-flow membrane filtration

TitleA unified model for quantification of concentration polarization (CP) of particles during cross-flow membrane filtration
Authors
KeywordsConcentration polarization (CP)
Critical flux
Hydrodynamic lift force
Inter-particle interactions
Particle diffusion
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/colsurfa
Citation
Colloids And Surfaces A: Physicochemical And Engineering Aspects, 2012, v. 407, p. 99-107 How to Cite?
AbstractBrownian diffusion, inter-particle interactions, shear-induced diffusion and hydrodynamic lift forces all contribute to restricting the formation of concentration polarization (CP) during cross-flow membrane filtration of particles. In this study, a unified CP model was developed for the quantification of the CP formation of colloidal particles. The basic methods adopted in previous models such as mass balance equation accounting for particle diffusion and convection, disintegration of the solid pressure and osmotic pressure and derivation of particle drift velocity are kept. In the new model, the hydrodynamic lift force is taken into account in the force balance equations and shear-induced diffusion is included in the particle transport process. The simulation results show that the inter-particle interactions and the hydrodynamic lift force are predominant for relatively small and large particles, respectively. More specifically, while the inter-particle interactions are important for relatively small (e.g. 2. a=. 10. nm) particles, the hydrodynamic lift force dominates for relatively large particles (e.g. 2. a=. 1. μm). Neither inter-particle interactions nor hydrodynamic lift forces play a significant role in CP formation of sub-micro particles (e.g. 2. a=. 100. nm), for which the solid fraction buildup within the CP formation is most severe. For filtration of relatively large particles under a fixed hydrodynamic condition, it appears that there is a critical flux, over which the particle deposition rate will increase dramatically. Similarly, at a fixed filtration flux, there exists a critical shear stress induced by the cross-flow, over which the membrane fouling rate will decrease sharply. Use of a higher shear intensity can effectively alleviate membrane fouling caused by particles of all size ranges. © 2012 Elsevier B.V..
Persistent Identifierhttp://hdl.handle.net/10722/163879
ISSN
2015 Impact Factor: 2.76
2015 SCImago Journal Rankings: 0.831
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, XMen_HK
dc.contributor.authorLi, XYen_HK
dc.date.accessioned2012-09-20T07:52:43Z-
dc.date.available2012-09-20T07:52:43Z-
dc.date.issued2012en_HK
dc.identifier.citationColloids And Surfaces A: Physicochemical And Engineering Aspects, 2012, v. 407, p. 99-107en_HK
dc.identifier.issn0927-7757en_HK
dc.identifier.urihttp://hdl.handle.net/10722/163879-
dc.description.abstractBrownian diffusion, inter-particle interactions, shear-induced diffusion and hydrodynamic lift forces all contribute to restricting the formation of concentration polarization (CP) during cross-flow membrane filtration of particles. In this study, a unified CP model was developed for the quantification of the CP formation of colloidal particles. The basic methods adopted in previous models such as mass balance equation accounting for particle diffusion and convection, disintegration of the solid pressure and osmotic pressure and derivation of particle drift velocity are kept. In the new model, the hydrodynamic lift force is taken into account in the force balance equations and shear-induced diffusion is included in the particle transport process. The simulation results show that the inter-particle interactions and the hydrodynamic lift force are predominant for relatively small and large particles, respectively. More specifically, while the inter-particle interactions are important for relatively small (e.g. 2. a=. 10. nm) particles, the hydrodynamic lift force dominates for relatively large particles (e.g. 2. a=. 1. μm). Neither inter-particle interactions nor hydrodynamic lift forces play a significant role in CP formation of sub-micro particles (e.g. 2. a=. 100. nm), for which the solid fraction buildup within the CP formation is most severe. For filtration of relatively large particles under a fixed hydrodynamic condition, it appears that there is a critical flux, over which the particle deposition rate will increase dramatically. Similarly, at a fixed filtration flux, there exists a critical shear stress induced by the cross-flow, over which the membrane fouling rate will decrease sharply. Use of a higher shear intensity can effectively alleviate membrane fouling caused by particles of all size ranges. © 2012 Elsevier B.V..en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/colsurfaen_HK
dc.relation.ispartofColloids and Surfaces A: Physicochemical and Engineering Aspectsen_HK
dc.subjectConcentration polarization (CP)en_HK
dc.subjectCritical fluxen_HK
dc.subjectHydrodynamic lift forceen_HK
dc.subjectInter-particle interactionsen_HK
dc.subjectParticle diffusionen_HK
dc.titleA unified model for quantification of concentration polarization (CP) of particles during cross-flow membrane filtrationen_HK
dc.typeArticleen_HK
dc.identifier.emailWang, XM: wangxm@hku.hken_HK
dc.identifier.authorityWang, XM=rp01452en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.colsurfa.2012.05.014en_HK
dc.identifier.scopuseid_2-s2.0-84862754660en_HK
dc.identifier.hkuros209078en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84862754660&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume407en_HK
dc.identifier.spage99en_HK
dc.identifier.epage107en_HK
dc.identifier.isiWOS:000306890200014-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, XM=23092524200en_HK
dc.identifier.scopusauthoridLi, XY=55240469000en_HK
dc.identifier.citeulike10824549-

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