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Article: Global behaviors of a round buoyant jet in a counterflow

TitleGlobal behaviors of a round buoyant jet in a counterflow
Authors
KeywordsBuoyant jets
Concentration
Effluents
Imaging techniques
Issue Date2006
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/hy.html
Citation
Journal Of Hydraulic Engineering, 2006, v. 132 n. 6, p. 589-604 How to Cite?
AbstractSpreading of a buoyant jet into a counterflowing ambient flow stream is investigated in the laboratory with the laser-induced fluorescence (LIF) technique. The jet behaviors are found to depend on two flow parameters. The densimetric Froude number (F) characterizes the ratio between the initial buoyant force on the jet effluent and the initial jet momentum. The jet-to-current velocity ratio (R) compares the initial jet exit velocity to the speed of the counterflow. Experiments are carried out at Froude numbers F=3-11 and velocity ratios R between 2.5 and 18. Time-averaged patterns of the jet are revealed by the mean LIF concentration field of jet effluent. Global features of the jet including its trajectory, spreading, and dilution are analyzed from the mean LIF images. The buoyant jet penetrates forward into the counterflow for some distance before it is turned backwards by the counterflow. Buoyancy in the effluent results in some vertical rise of the jet in this first region of forward flow, especially at a high velocity ratio. The flow then transits into the second region of backward flow. Buoyant jet effluent is advected backwards by the counterflow and at the same time continuing to rise in a plume-like manner. Radial profiles of mean effluent concentration at successive stations along the jet centerline are found to follow reasonably well the Gaussian distribution. The predictions of the Lagrangian model JETLAG are compared with the experimental data for this complex situation of buoyant jet in counterflow. The jet trajectory data are also interpreted using a length scale analysis. © ASCE.
Persistent Identifierhttp://hdl.handle.net/10722/129121
ISSN
2015 Impact Factor: 1.284
2015 SCImago Journal Rankings: 0.908
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLam, KMen_HK
dc.contributor.authorLee, WYen_HK
dc.contributor.authorChan, CHCen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2010-12-23T08:32:50Z-
dc.date.available2010-12-23T08:32:50Z-
dc.date.issued2006en_HK
dc.identifier.citationJournal Of Hydraulic Engineering, 2006, v. 132 n. 6, p. 589-604en_HK
dc.identifier.issn0733-9429en_HK
dc.identifier.urihttp://hdl.handle.net/10722/129121-
dc.description.abstractSpreading of a buoyant jet into a counterflowing ambient flow stream is investigated in the laboratory with the laser-induced fluorescence (LIF) technique. The jet behaviors are found to depend on two flow parameters. The densimetric Froude number (F) characterizes the ratio between the initial buoyant force on the jet effluent and the initial jet momentum. The jet-to-current velocity ratio (R) compares the initial jet exit velocity to the speed of the counterflow. Experiments are carried out at Froude numbers F=3-11 and velocity ratios R between 2.5 and 18. Time-averaged patterns of the jet are revealed by the mean LIF concentration field of jet effluent. Global features of the jet including its trajectory, spreading, and dilution are analyzed from the mean LIF images. The buoyant jet penetrates forward into the counterflow for some distance before it is turned backwards by the counterflow. Buoyancy in the effluent results in some vertical rise of the jet in this first region of forward flow, especially at a high velocity ratio. The flow then transits into the second region of backward flow. Buoyant jet effluent is advected backwards by the counterflow and at the same time continuing to rise in a plume-like manner. Radial profiles of mean effluent concentration at successive stations along the jet centerline are found to follow reasonably well the Gaussian distribution. The predictions of the Lagrangian model JETLAG are compared with the experimental data for this complex situation of buoyant jet in counterflow. The jet trajectory data are also interpreted using a length scale analysis. © ASCE.en_HK
dc.languageengen_US
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/hy.htmlen_HK
dc.relation.ispartofJournal of Hydraulic Engineeringen_HK
dc.rightsJournal of Hydraulic Engineering. Copyright © American Society of Civil Engineers.-
dc.subjectBuoyant jetsen_HK
dc.subjectConcentrationen_HK
dc.subjectEffluentsen_HK
dc.subjectImaging techniquesen_HK
dc.titleGlobal behaviors of a round buoyant jet in a counterflowen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9429&volume=132&issue=6&spage=589&epage=604&date=2006&atitle=Global+behavior+of+a+round+buoyant+jet+in+a+counterflow-
dc.identifier.emailLam, KM: kmlam@hku.hken_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLam, KM=rp00134en_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1061/(ASCE)0733-9429(2006)132:6(589)en_HK
dc.identifier.scopuseid_2-s2.0-33646699133en_HK
dc.identifier.hkuros177004en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33646699133&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume132en_HK
dc.identifier.issue6en_HK
dc.identifier.spage589en_HK
dc.identifier.epage604en_HK
dc.identifier.isiWOS:000237670100006-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLam, KM=7403656958en_HK
dc.identifier.scopusauthoridLee, WY=7407088222en_HK
dc.identifier.scopusauthoridChan, CHC=55031165800en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK

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