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Article: Semianalytical Self-Similar Solution of Bent-Over Jet in Cross-Flow

TitleSemianalytical Self-Similar Solution of Bent-Over Jet in Cross-Flow
Authors
Issue Date1999
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/em.html
Citation
Journal of Engineering Mechanics, 1999, v. 125 n. 7, p. 733-746 How to Cite?
AbstractThe flow and scalar field in the cross section of a bent-over momentum jet in cross-flow has been investigated via a 2D numerical solution of the governing equations with similarity transformation. The semianalytical model employs a free shear layer model for turbulent closure and the assumption of a constant velocity in the direction of the cross-flow; the entire solution depends solely on a dimensionless turbulent mixing parameter λ that measures the relative importance of advection and diffusion. The computed streamlines and vorticity field clearly indicate a vortex-pair flow for all λ. The shape of the scalar distribution, however, grows from a circular cell to a kidney-shaped double peak structure. Using a value of λ = 55, the computed jet trajectory and spreading and the cross-sectional shape are in good agreement with the experiments, although the dilution is somewhat overpredicted. The results suggest a free shear layer model of ε = 0.0272Wml*, where ε, Wm, and l* are the eddy viscosity, maximum velocity, and half-width in the bent-over jet cross section, respectively.
Persistent Identifierhttp://hdl.handle.net/10722/70977
ISSN
2015 Impact Factor: 1.346
2015 SCImago Journal Rankings: 0.747

 

DC FieldValueLanguage
dc.contributor.authorLee, JHW-
dc.contributor.authorLi, L-
dc.contributor.authorCheung, V-
dc.date.accessioned2010-09-06T06:27:48Z-
dc.date.available2010-09-06T06:27:48Z-
dc.date.issued1999-
dc.identifier.citationJournal of Engineering Mechanics, 1999, v. 125 n. 7, p. 733-746-
dc.identifier.issn0733-9399-
dc.identifier.urihttp://hdl.handle.net/10722/70977-
dc.description.abstractThe flow and scalar field in the cross section of a bent-over momentum jet in cross-flow has been investigated via a 2D numerical solution of the governing equations with similarity transformation. The semianalytical model employs a free shear layer model for turbulent closure and the assumption of a constant velocity in the direction of the cross-flow; the entire solution depends solely on a dimensionless turbulent mixing parameter λ that measures the relative importance of advection and diffusion. The computed streamlines and vorticity field clearly indicate a vortex-pair flow for all λ. The shape of the scalar distribution, however, grows from a circular cell to a kidney-shaped double peak structure. Using a value of λ = 55, the computed jet trajectory and spreading and the cross-sectional shape are in good agreement with the experiments, although the dilution is somewhat overpredicted. The results suggest a free shear layer model of ε = 0.0272Wml*, where ε, Wm, and l* are the eddy viscosity, maximum velocity, and half-width in the bent-over jet cross section, respectively.-
dc.languageeng-
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/em.html-
dc.relation.ispartofJournal of Engineering Mechanics-
dc.rightsJournal of Engineering Mechanics. Copyright © American Society of Civil Engineers.-
dc.titleSemianalytical Self-Similar Solution of Bent-Over Jet in Cross-Flow-
dc.typeArticle-
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9399&volume=125&spage=733 &epage= 746&date=1999&atitle=A+semi-analytical+self-similar+solution+of+a+bent-over+jet+in+crossflowen_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hk-
dc.identifier.authorityLee, JHW=rp00061-
dc.identifier.doi10.1061/(ASCE)0733-9399(1999)125:7(733)-
dc.identifier.hkuros48266-
dc.identifier.volume125-
dc.identifier.issue7-
dc.identifier.spage733-
dc.identifier.epage746-
dc.publisher.placeUnited States-

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