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Article: Potential core lengths of round jets in stagnant and moving environments

TitlePotential core lengths of round jets in stagnant and moving environments
Authors
KeywordsConcentration
Jets
PIV
ZFE
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711617/description#description
Citation
Journal Of Hydro-Environment Research, 2011, v. 5 n. 2, p. 81-91 How to Cite?
AbstractThis paper investigates the change of velocity and concentration fields in the initial region of a round jet in stagnant fluid and in a moving environment of the co-flow, counter-flow or cross-flow situation. The aim was to discuss issues of flow establishment and in the initial region, to determine the potential core length, and to observe the effect of a moving ambient. Turbulent jet velocities and concentration were measured with the planar imaging techniques of particle-image velocimetry (PIV) and laser-induced fluorescence (LIF). The mean flow fields were obtained and analyzed to investigate the validity of 1/. x decay relationship for jet centerline velocity and concentration. Values for the decay constant and jet virtual origin were obtained from the data. While the results show that the decay constant is increased by a co-flow but reduced by a counter-flow or a cross-flow, the virtual origin was found to be affected as well. The overall effect is that any situation of the moving environment leads to a slight reduction of the physical length of the potential core. The paper also suggests an intermittency function for the analysis of fluctuating jet concentration field in the potential core. The mean intermittency function provides a direct and reliable estimate of the potential core length of a jet in a moving environment. © 2011 International Association of Hydro-environment Engineering and Research, Asia Pacific Division.
Persistent Identifierhttp://hdl.handle.net/10722/137248
ISSN
2015 Impact Factor: 1.971
2015 SCImago Journal Rankings: 0.641
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongHKU 7517/03E
Funding Information:

The investigation is supported by a research grant (HKU 7517/03E) awarded by the Research Grants Council of Hong Kong.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorOr, CMen_HK
dc.contributor.authorLam, KMen_HK
dc.contributor.authorLiu, Pen_HK
dc.date.accessioned2011-08-26T14:21:44Z-
dc.date.available2011-08-26T14:21:44Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal Of Hydro-Environment Research, 2011, v. 5 n. 2, p. 81-91en_HK
dc.identifier.issn1570-6443en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137248-
dc.description.abstractThis paper investigates the change of velocity and concentration fields in the initial region of a round jet in stagnant fluid and in a moving environment of the co-flow, counter-flow or cross-flow situation. The aim was to discuss issues of flow establishment and in the initial region, to determine the potential core length, and to observe the effect of a moving ambient. Turbulent jet velocities and concentration were measured with the planar imaging techniques of particle-image velocimetry (PIV) and laser-induced fluorescence (LIF). The mean flow fields were obtained and analyzed to investigate the validity of 1/. x decay relationship for jet centerline velocity and concentration. Values for the decay constant and jet virtual origin were obtained from the data. While the results show that the decay constant is increased by a co-flow but reduced by a counter-flow or a cross-flow, the virtual origin was found to be affected as well. The overall effect is that any situation of the moving environment leads to a slight reduction of the physical length of the potential core. The paper also suggests an intermittency function for the analysis of fluctuating jet concentration field in the potential core. The mean intermittency function provides a direct and reliable estimate of the potential core length of a jet in a moving environment. © 2011 International Association of Hydro-environment Engineering and Research, Asia Pacific Division.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711617/description#descriptionen_HK
dc.relation.ispartofJournal of Hydro-Environment Researchen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Hydro-Environment Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Hydro-Environment Research, 2011, v. 5 n. 2, p. 81-91. DOI: http://dx.doi.org/10.1016/j.jher.2011.01.002-
dc.subjectConcentrationen_HK
dc.subjectJetsen_HK
dc.subjectPIVen_HK
dc.subjectZFEen_HK
dc.titlePotential core lengths of round jets in stagnant and moving environmentsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1570-6443&volume=5&issue=2&spage=81&epage=91&date=2011&atitle=Potential+core+lengths+of+round+jets+in+stagnant+and+moving+environments-
dc.identifier.emailLam, KM:kmlam@hku.hken_HK
dc.identifier.authorityLam, KM=rp00134en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.jher.2011.01.002en_HK
dc.identifier.scopuseid_2-s2.0-79956066843en_HK
dc.identifier.hkuros190701en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79956066843&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume5en_HK
dc.identifier.issue2en_HK
dc.identifier.spage81en_HK
dc.identifier.epage91en_HK
dc.identifier.isiWOS:000291414800002-
dc.publisher.placeNetherlandsen_HK
dc.relation.projectExperimental investigation on the zone of flow establishment in a submerged round jet in a current-
dc.identifier.scopusauthoridOr, CM=39561342000en_HK
dc.identifier.scopusauthoridLam, KM=7403656958en_HK
dc.identifier.scopusauthoridLiu, P=35799939000en_HK

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