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Article: Dispersion in open-channel flow subject to the processes of sorptive exchange on the bottom and air-water exchange on the free surface

TitleDispersion in open-channel flow subject to the processes of sorptive exchange on the bottom and air-water exchange on the free surface
Authors
KeywordsEnvironmental transport processes
Homogenization method
Taylor dispersion
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/journals/fdr
Citation
Fluid Dynamics Research, 2006, v. 38 n. 6, p. 359-385 How to Cite?
AbstractAn analytical study is presented of dispersion in steady and oscillatory open-channel flows under the combined effects due to reversible sorptive phase exchange with the bed and irreversible air-water reaction on the free surface. The free-surface reaction is assumed to be so weak that the asymptotic mean concentration can be developed well before undue substantial loss to the air occurs. The effective advection-dispersion transport equation, which is derived using a multiple-scale homogenization technique, contains formal expressions for the various components of the dispersion coefficient arising from the two chemical effects. Numerical calculations demonstrate that, as long as the bed is sorbing, the kinetics of the sorptive exchange plays a key role in controlling the overall dispersion mechanism. The otherwise weak effects of the free-surface loss can be significantly enhanced by the presence of kinetic phase exchange on the bottom. © 2006 The Japan Society of Fluid Mechanics and Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/75662
ISSN
2015 Impact Factor: 0.846
2015 SCImago Journal Rankings: 0.463
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNg, COen_HK
dc.date.accessioned2010-09-06T07:13:21Z-
dc.date.available2010-09-06T07:13:21Z-
dc.date.issued2006en_HK
dc.identifier.citationFluid Dynamics Research, 2006, v. 38 n. 6, p. 359-385en_HK
dc.identifier.issn0169-5983en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75662-
dc.description.abstractAn analytical study is presented of dispersion in steady and oscillatory open-channel flows under the combined effects due to reversible sorptive phase exchange with the bed and irreversible air-water reaction on the free surface. The free-surface reaction is assumed to be so weak that the asymptotic mean concentration can be developed well before undue substantial loss to the air occurs. The effective advection-dispersion transport equation, which is derived using a multiple-scale homogenization technique, contains formal expressions for the various components of the dispersion coefficient arising from the two chemical effects. Numerical calculations demonstrate that, as long as the bed is sorbing, the kinetics of the sorptive exchange plays a key role in controlling the overall dispersion mechanism. The otherwise weak effects of the free-surface loss can be significantly enhanced by the presence of kinetic phase exchange on the bottom. © 2006 The Japan Society of Fluid Mechanics and Elsevier B.V.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/journals/fdren_HK
dc.relation.ispartofFluid Dynamics Researchen_HK
dc.rightsFluid Dynamics Research. Copyright © Elsevier BV.en_HK
dc.subjectEnvironmental transport processesen_HK
dc.subjectHomogenization methoden_HK
dc.subjectTaylor dispersionen_HK
dc.titleDispersion in open-channel flow subject to the processes of sorptive exchange on the bottom and air-water exchange on the free surfaceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0169-5983&volume=38&issue=6&spage=359&epage=385&date=2006&atitle=Dispersion+in+open-channel+flow+subject+to+the+processes+of+sorptive+exchange+on+the+bottom+and+air-water+exchange+on+the+free+surfaceen_HK
dc.identifier.emailNg, CO:cong@hku.hken_HK
dc.identifier.authorityNg, CO=rp00224en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.fluiddyn.2006.02.002en_HK
dc.identifier.scopuseid_2-s2.0-33646191708en_HK
dc.identifier.hkuros115540en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33646191708&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue6en_HK
dc.identifier.spage359en_HK
dc.identifier.epage385en_HK
dc.identifier.isiWOS:000237987200001-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNg, CO=7401705594en_HK

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