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Article: Turbulent transport of passive scalar behind line sources in an unstably stratified open channel flow

TitleTurbulent transport of passive scalar behind line sources in an unstably stratified open channel flow
Authors
KeywordsAtmospheric boundary layer (ABL)
Direct numerical simulation (DNS)
Line sources
Open channel flow
Unstable stratification
Vertical plume meandering
Issue Date2006
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmt
Citation
International Journal Of Heat And Mass Transfer, 2006, v. 49 n. 23-24, p. 4305-4324 How to Cite?
AbstractThis study employs a direct numerical simulation (DNS) technique to study the flow, turbulence structure, and passive scalar plume transport behind line sources in an unstably stratified open channel flow. The scalar transport behaviors for five emission heights (zs = 0, 0.25H, 0.5H, 0.75H, and H, where H is the channel height) at a Reynolds number of 3000, a Prandtl number and a Schmidt number of 0.72, and a Richardson number of -0.2 are investigated. The vertically meandering mean plume heights and dispersion coefficients calculated by the current DNS model agree well with laboratory results and field measurements in literature. It is found that the plume meandering is due to the movement of the positive and negative vertical turbulent scalar fluxes above and below the mean plume heights, respectively. These findings help explaining the plume meandering mechanism in the unstably stratified atmospheric boundary layer. © 2006 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/75839
ISSN
2015 Impact Factor: 2.857
2015 SCImago Journal Rankings: 1.749
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, CHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-09-06T07:15:04Z-
dc.date.available2010-09-06T07:15:04Z-
dc.date.issued2006en_HK
dc.identifier.citationInternational Journal Of Heat And Mass Transfer, 2006, v. 49 n. 23-24, p. 4305-4324en_HK
dc.identifier.issn0017-9310en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75839-
dc.description.abstractThis study employs a direct numerical simulation (DNS) technique to study the flow, turbulence structure, and passive scalar plume transport behind line sources in an unstably stratified open channel flow. The scalar transport behaviors for five emission heights (zs = 0, 0.25H, 0.5H, 0.75H, and H, where H is the channel height) at a Reynolds number of 3000, a Prandtl number and a Schmidt number of 0.72, and a Richardson number of -0.2 are investigated. The vertically meandering mean plume heights and dispersion coefficients calculated by the current DNS model agree well with laboratory results and field measurements in literature. It is found that the plume meandering is due to the movement of the positive and negative vertical turbulent scalar fluxes above and below the mean plume heights, respectively. These findings help explaining the plume meandering mechanism in the unstably stratified atmospheric boundary layer. © 2006 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmten_HK
dc.relation.ispartofInternational Journal of Heat and Mass Transferen_HK
dc.subjectAtmospheric boundary layer (ABL)en_HK
dc.subjectDirect numerical simulation (DNS)en_HK
dc.subjectLine sourcesen_HK
dc.subjectOpen channel flowen_HK
dc.subjectUnstable stratificationen_HK
dc.subjectVertical plume meanderingen_HK
dc.titleTurbulent transport of passive scalar behind line sources in an unstably stratified open channel flowen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0017-9310&volume=49&spage=4305&epage=4324&date=2006&atitle=Turbulent+transport+of+passive+scalar+behind+line+sources+in+an+unstably+stratified+open+channel+flowen_HK
dc.identifier.emailLiu, CH:chliu@hkucc.hku.hken_HK
dc.identifier.emailLeung, DYC:ycleung@hku.hken_HK
dc.identifier.authorityLiu, CH=rp00152en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ijheatmasstransfer.2006.05.026en_HK
dc.identifier.scopuseid_2-s2.0-33746904376en_HK
dc.identifier.hkuros129409en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33746904376&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume49en_HK
dc.identifier.issue23-24en_HK
dc.identifier.spage4305en_HK
dc.identifier.epage4324en_HK
dc.identifier.isiWOS:000241138500004-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLiu, CH=36065161300en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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