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Article: A time-varying diffusivity model for shear dispersion in oscillatory channel flow

TitleA time-varying diffusivity model for shear dispersion in oscillatory channel flow
Authors
KeywordsHomogenization Method
Taylor Dispersion
Time-Varying Eddy Viscosity
Issue Date2004
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/journals/fdr
Citation
Fluid Dynamics Research, 2004, v. 34 n. 6, p. 335-355 How to Cite?
AbstractAn analysis is presented of the shear dispersion in turbulent channel flow forced by a purely oscillatory pressure gradient. The flow is described by an algebraic eddy viscosity model in which the instantaneous flow and viscosity are inter-dependent. Both eddy viscosity and eddy diffusivity contain a second-harmonic time-varying component. The effective transport equation is derived using a two-time-scale perturbation analysis, which also yields a closed-form expression for the dispersion coefficient. Numerical results demonstrate that, in this problem, the time-varying component of the eddy diffusivity can have a finite effect on the dispersion coefficient, which can be as much as a 30% difference from that obtained from a time-invariant eddy viscosity model. © 2004 The Japan Society of Fluid Mechanics and Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156779
ISSN
2015 Impact Factor: 0.846
2015 SCImago Journal Rankings: 0.463
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNg, COen_US
dc.date.accessioned2012-08-08T08:43:57Z-
dc.date.available2012-08-08T08:43:57Z-
dc.date.issued2004en_US
dc.identifier.citationFluid Dynamics Research, 2004, v. 34 n. 6, p. 335-355en_US
dc.identifier.issn0169-5983en_US
dc.identifier.urihttp://hdl.handle.net/10722/156779-
dc.description.abstractAn analysis is presented of the shear dispersion in turbulent channel flow forced by a purely oscillatory pressure gradient. The flow is described by an algebraic eddy viscosity model in which the instantaneous flow and viscosity are inter-dependent. Both eddy viscosity and eddy diffusivity contain a second-harmonic time-varying component. The effective transport equation is derived using a two-time-scale perturbation analysis, which also yields a closed-form expression for the dispersion coefficient. Numerical results demonstrate that, in this problem, the time-varying component of the eddy diffusivity can have a finite effect on the dispersion coefficient, which can be as much as a 30% difference from that obtained from a time-invariant eddy viscosity model. © 2004 The Japan Society of Fluid Mechanics and Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/journals/fdren_US
dc.relation.ispartofFluid Dynamics Researchen_US
dc.rightsFluid Dynamics Research. Copyright © Elsevier BV.-
dc.subjectHomogenization Methoden_US
dc.subjectTaylor Dispersionen_US
dc.subjectTime-Varying Eddy Viscosityen_US
dc.titleA time-varying diffusivity model for shear dispersion in oscillatory channel flowen_US
dc.typeArticleen_US
dc.identifier.emailNg, CO: cong@hku.hken_US
dc.identifier.authorityNg, CO=rp00224en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.fluiddyn.2004.03.001en_US
dc.identifier.scopuseid_2-s2.0-2442461979en_US
dc.identifier.hkuros90379-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-2442461979&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume34en_US
dc.identifier.issue6en_US
dc.identifier.spage335en_US
dc.identifier.epage355en_US
dc.identifier.isiWOS:000222002100001-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridNg, CO=7401705594en_US

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