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Article: Mixing of a Rosette Jet Group in a Crossflow

TitleMixing of a Rosette Jet Group in a Crossflow
Authors
KeywordsCrossflow
Jetties
Outfall sewers
Plumes
Turbulent flow
Water quality
Issue Date2011
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, 2011, v. 137 n. 8, p. 787-803 How to Cite?
AbstractPartially treated wastewater is often discharged into coastal waters through an outfall diffuser fitted with clustered ports on risers. On each riser the effluent is discharged through two to eight ports arranged circumferentially, in the form of a rosette-shaped buoyant jet group. The near field mixing of such a jet group in a tidal flow is determined by the merging and interaction of coflowing, oblique-flowing, cross-flowing, and counterflowing jets. Despite numerous studies, a general predictive method for such complex jet groups has not been reported; ocean outfall design is often based on comprehensive physical model experiments. The mixing of merging nonbuoyant and buoyant jets issuing from a rosette outfall riser into an ambient current is studied experimentally by using the laser-induced fluorescence technique. Detailed cross-sectional measurements of the scalar concentration field downstream of the bent-over jets are made. The trajectories of multiple and individual jets discharging at various angles are measured. For typical outfall designs, the dynamic interaction of adjacent jets is found to be negligible. The average dilution of the jet group can be predicted by accounting for jet merging and plume overlapping. Theoretical predictions using the Lagrangian VISJET model are in excellent agreement with the experimental data and also results of previous studies in a stratified crossflow. The model correctly predicts the changes in near field dilution as a function of the number of nozzles on a riser, or the number of risers on a diffuser, and helps to resolve observed anomalies in previous studies. © 2011 American Society of Civil Engineers.
Persistent Identifierhttp://hdl.handle.net/10722/139045
ISSN
2015 Impact Factor: 1.284
2015 SCImago Journal Rankings: 0.908
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grants CouncilHKU 7518/03
University Grants CommitteeAoE/P-04/04
Funding Information:

This work is supported by the Hong Kong Research Grants Council (Project No. HKU 7518/03), and in part by a grant from the University Grants Committee (Project No. AoE/P-04/04). The assistance of Chris Lai in the experimental investigation is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorLai, ACHen_HK
dc.contributor.authorYu, Den_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2011-09-23T05:44:34Z-
dc.date.available2011-09-23T05:44:34Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal Of Hydraulic Engineering, 2011, v. 137 n. 8, p. 787-803en_HK
dc.identifier.issn0733-9429en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139045-
dc.description.abstractPartially treated wastewater is often discharged into coastal waters through an outfall diffuser fitted with clustered ports on risers. On each riser the effluent is discharged through two to eight ports arranged circumferentially, in the form of a rosette-shaped buoyant jet group. The near field mixing of such a jet group in a tidal flow is determined by the merging and interaction of coflowing, oblique-flowing, cross-flowing, and counterflowing jets. Despite numerous studies, a general predictive method for such complex jet groups has not been reported; ocean outfall design is often based on comprehensive physical model experiments. The mixing of merging nonbuoyant and buoyant jets issuing from a rosette outfall riser into an ambient current is studied experimentally by using the laser-induced fluorescence technique. Detailed cross-sectional measurements of the scalar concentration field downstream of the bent-over jets are made. The trajectories of multiple and individual jets discharging at various angles are measured. For typical outfall designs, the dynamic interaction of adjacent jets is found to be negligible. The average dilution of the jet group can be predicted by accounting for jet merging and plume overlapping. Theoretical predictions using the Lagrangian VISJET model are in excellent agreement with the experimental data and also results of previous studies in a stratified crossflow. The model correctly predicts the changes in near field dilution as a function of the number of nozzles on a riser, or the number of risers on a diffuser, and helps to resolve observed anomalies in previous studies. © 2011 American Society of Civil Engineers.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.en_US
dc.subjectCrossflowen_HK
dc.subjectJettiesen_HK
dc.subjectOutfall sewersen_HK
dc.subjectPlumesen_HK
dc.subjectTurbulent flowen_HK
dc.subjectWater qualityen_HK
dc.titleMixing of a Rosette Jet Group in a Crossflowen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9429&volume=137&issue=8&spage=787&epage=803&date=2011&atitle=Mixing+of+a+rosette+jet+group+in+a+crossflowen_US
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1061/(ASCE)HY.1943-7900.0000359en_HK
dc.identifier.scopuseid_2-s2.0-79961069205en_HK
dc.identifier.hkuros192990en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79961069205&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume137en_HK
dc.identifier.issue8en_HK
dc.identifier.spage787en_HK
dc.identifier.epage803en_HK
dc.identifier.isiWOS:000293530300001-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLai, ACH=34971549400en_HK
dc.identifier.scopusauthoridYu, D=55481575200en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK

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