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Article: Advected turbulent line thermal driven by concentration difference

TitleAdvected turbulent line thermal driven by concentration difference
Authors
KeywordsEnvironmental fluid mechanics
Thermal and plume
Issue Date2002
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cnsns
Citation
Communications In Nonlinear Science And Numerical Simulation, 2002, v. 7 n. 4, p. 175-195 How to Cite?
AbstractThe spatial evolution of an advected line thermal driven by concentration difference - a turbulent buoyant body of fluid, for which small density difference is caused by a proportional variation in scalar concentration, horizontally introduced at no excess momentum into a horizontal ambient current, is studied using the standard two-equation k-ε model with a buoyancy expansion. The numerical results show that the advected line thermal is characterized longitudinally by a flat trajectory with scalar dilution taking place essentially near the jet exit, and transversely by a vortex-pair flow and a kidney-shaped concentration structure with double peak maxima corresponding to stronger buoyancy effect; the computed flow details and scalar mixing characteristics can be described by self-similar relations beyond a dimensionless distance of around 10; the aspect ratio for the kidney-shaped sectional thermal is found to be around 1.2-1.4; the predicted flow feature and mixing rate are well supported by asymptotic dimensional analysis and related experimental data. The analogy between a steady advected line thermal and corresponding time-dependent line thermal is also found reasonable by a special exploration into the horizontal velocity distribution and the significance of horizontal diffusion effect of the advected line thermal. Only about half of the vertical momentum resulting from the buoyancy effect is found contained in the advected line thermal, corresponding to an added virtual mass coefficient of approximately 1 for the sectional thermal. © 2002 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/70825
ISSN
2015 Impact Factor: 2.834
2015 SCImago Journal Rankings: 1.575
References

 

DC FieldValueLanguage
dc.contributor.authorChen, GQen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2010-09-06T06:26:27Z-
dc.date.available2010-09-06T06:26:27Z-
dc.date.issued2002en_HK
dc.identifier.citationCommunications In Nonlinear Science And Numerical Simulation, 2002, v. 7 n. 4, p. 175-195en_HK
dc.identifier.issn1007-5704en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70825-
dc.description.abstractThe spatial evolution of an advected line thermal driven by concentration difference - a turbulent buoyant body of fluid, for which small density difference is caused by a proportional variation in scalar concentration, horizontally introduced at no excess momentum into a horizontal ambient current, is studied using the standard two-equation k-ε model with a buoyancy expansion. The numerical results show that the advected line thermal is characterized longitudinally by a flat trajectory with scalar dilution taking place essentially near the jet exit, and transversely by a vortex-pair flow and a kidney-shaped concentration structure with double peak maxima corresponding to stronger buoyancy effect; the computed flow details and scalar mixing characteristics can be described by self-similar relations beyond a dimensionless distance of around 10; the aspect ratio for the kidney-shaped sectional thermal is found to be around 1.2-1.4; the predicted flow feature and mixing rate are well supported by asymptotic dimensional analysis and related experimental data. The analogy between a steady advected line thermal and corresponding time-dependent line thermal is also found reasonable by a special exploration into the horizontal velocity distribution and the significance of horizontal diffusion effect of the advected line thermal. Only about half of the vertical momentum resulting from the buoyancy effect is found contained in the advected line thermal, corresponding to an added virtual mass coefficient of approximately 1 for the sectional thermal. © 2002 Elsevier Science B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cnsnsen_HK
dc.relation.ispartofCommunications in Nonlinear Science and Numerical Simulationen_HK
dc.rightsCommunications in Nonlinear Science and Numerical Simulation. Copyright © Elsevier BV.en_HK
dc.subjectEnvironmental fluid mechanicsen_HK
dc.subjectThermal and plumeen_HK
dc.titleAdvected turbulent line thermal driven by concentration differenceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1007-5704&volume=7&spage=175&epage=195&date=2002&atitle=Advected+turbulent+line+thermal+driven+by+concentration+differenceen_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S1007-5704(02)00004-7en_HK
dc.identifier.scopuseid_2-s2.0-15844384192en_HK
dc.identifier.hkuros82368en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-15844384192&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume7en_HK
dc.identifier.issue4en_HK
dc.identifier.spage175en_HK
dc.identifier.epage195en_HK
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridChen, GQ=25654689700en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK

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