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Article: Effect of lateral confinement on initial dilution of vertical round buoyant jet

TitleEffect of lateral confinement on initial dilution of vertical round buoyant jet
Authors
Issue Date1998
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, 1998, v. 124 n. 3, p. 263-278 How to Cite?
AbstractIn relatively shallow coastal waters, a submarine outfall pipeline is often laid in a dredged trench and the wastewater jet discharges inside a concentric enclosure (a protective riser tube) before release at the seabed. The effect of such lateral confinement over a finite vertical length on the mixing of a buoyant jet is studied experimentally for a wide range of geometries. A confinement index β = Hr/(Dr - D) is proposed to categorize the confined buoyant jet, where Hr and Dr are the height and diameter of the confinement, respectively, and D is the jet diameter. Compared to the dilution of the corresponding free buoyant jet, it is found that mixing is impaired for β ≥ 3. For β » 1, the jet is highly confined and there is virtually no dilution within the riser. For β ≤ 1.5, the confinement has no effect. For 1.5 ≤ β ≤ 3, a wall-attached swirling plume with enhanced dilution is observed, and the mixing behavior is complex. Simple relations for predicting the initial dilution of a laterally confined plume are presented.
Persistent Identifierhttp://hdl.handle.net/10722/71205
ISSN
2015 Impact Factor: 1.284
2015 SCImago Journal Rankings: 0.908
References

 

DC FieldValueLanguage
dc.contributor.authorLee, AWTen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2010-09-06T06:29:53Z-
dc.date.available2010-09-06T06:29:53Z-
dc.date.issued1998en_HK
dc.identifier.citationJournal Of Hydraulic Engineering, 1998, v. 124 n. 3, p. 263-278en_HK
dc.identifier.issn0733-9429en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71205-
dc.description.abstractIn relatively shallow coastal waters, a submarine outfall pipeline is often laid in a dredged trench and the wastewater jet discharges inside a concentric enclosure (a protective riser tube) before release at the seabed. The effect of such lateral confinement over a finite vertical length on the mixing of a buoyant jet is studied experimentally for a wide range of geometries. A confinement index β = Hr/(Dr - D) is proposed to categorize the confined buoyant jet, where Hr and Dr are the height and diameter of the confinement, respectively, and D is the jet diameter. Compared to the dilution of the corresponding free buoyant jet, it is found that mixing is impaired for β ≥ 3. For β » 1, the jet is highly confined and there is virtually no dilution within the riser. For β ≤ 1.5, the confinement has no effect. For 1.5 ≤ β ≤ 3, a wall-attached swirling plume with enhanced dilution is observed, and the mixing behavior is complex. Simple relations for predicting the initial dilution of a laterally confined plume are presented.en_HK
dc.languageengen_HK
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_HK
dc.titleEffect of lateral confinement on initial dilution of vertical round buoyant jeten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9429&volume=124 &issue=3&spage=263 &epage= 279&date=1998&atitle=Effect+of+lateral+confinement+on+initial+dilution+of+vertical+round+buoyant+jeten_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0032029675en_HK
dc.identifier.hkuros36641en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032029675&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume124en_HK
dc.identifier.issue3en_HK
dc.identifier.spage263en_HK
dc.identifier.epage278en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLee, AWT=7405629827en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK

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