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Article: Experimental investigation of near-field stream-wise flow development and spatial structure in triple buoyant plumes

TitleExperimental investigation of near-field stream-wise flow development and spatial structure in triple buoyant plumes
Authors
KeywordsMerging level
Quasi-combined level
Self-similarity
Source spacing
Spatial structure
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
Citation
Building and Environment, 2019, v. 149, p. 79-89 How to Cite?
AbstractThis paper presents a systematic experimental study on stream-wise flow development and spatial structure of triple buoyant plumes. Two-dimensional Particle Image Velocimetry (2-D PIV) is employed to resolve velocity fields. Stream-wise axial velocity profiles, flow structure, flow region parameters, and self-similarity properties are analyzed at different configurations that are characterized by spacing ratios S/W (source spacing S divided by source width W). From velocity fields and axial velocity profiles, a similar stream-wise developing trend is identified in different source configurations. When near-field plumes travel downstream, axial velocities increase rapidly, off-center velocity peaks get merged with the central peak, and the number of velocity peaks reduces with the downstream distance. A compact source layout, comparing with the wide one, could enhance the near-field plumes interaction and promote the plumes deflection significantly. Fundamentally, the stream-wise spatial structure of the triple plumes initially consists of a converging region, followed by a merging region, and finally a combined region. By examining the averaged velocity fields, flow recirculation with negative axial velocities is found to scarcely exist in the converging region. Merging level Zm and quasi-combined level Zqc are analyzed quantitatively and statistically. Within the studied S/W range, the normalized Zm shows a linear increase with S/W in the formula of Zm/H=2.007(S/W)+1.173 and the normalized Zqc gives a power law increase with S/W in the formula of Zqc/H=6.035(S/W)0.4959. In addition, triple plumes are found to establish self-similarity approximately at Z = 3H with S/W of 0.2 and at Z = 4.5H with S/W of 0.5. © 2018 Elsevier Ltd
Persistent Identifierhttp://hdl.handle.net/10722/278212
ISSN
2017 Impact Factor: 4.539
2015 SCImago Journal Rankings: 2.121

 

DC FieldValueLanguage
dc.contributor.authorYIN, S-
dc.contributor.authorLi, Y-
dc.contributor.authorFAN, Y-
dc.contributor.authorSandberg, M-
dc.date.accessioned2019-10-04T08:09:38Z-
dc.date.available2019-10-04T08:09:38Z-
dc.date.issued2019-
dc.identifier.citationBuilding and Environment, 2019, v. 149, p. 79-89-
dc.identifier.issn0360-1323-
dc.identifier.urihttp://hdl.handle.net/10722/278212-
dc.description.abstractThis paper presents a systematic experimental study on stream-wise flow development and spatial structure of triple buoyant plumes. Two-dimensional Particle Image Velocimetry (2-D PIV) is employed to resolve velocity fields. Stream-wise axial velocity profiles, flow structure, flow region parameters, and self-similarity properties are analyzed at different configurations that are characterized by spacing ratios S/W (source spacing S divided by source width W). From velocity fields and axial velocity profiles, a similar stream-wise developing trend is identified in different source configurations. When near-field plumes travel downstream, axial velocities increase rapidly, off-center velocity peaks get merged with the central peak, and the number of velocity peaks reduces with the downstream distance. A compact source layout, comparing with the wide one, could enhance the near-field plumes interaction and promote the plumes deflection significantly. Fundamentally, the stream-wise spatial structure of the triple plumes initially consists of a converging region, followed by a merging region, and finally a combined region. By examining the averaged velocity fields, flow recirculation with negative axial velocities is found to scarcely exist in the converging region. Merging level Zm and quasi-combined level Zqc are analyzed quantitatively and statistically. Within the studied S/W range, the normalized Zm shows a linear increase with S/W in the formula of Zm/H=2.007(S/W)+1.173 and the normalized Zqc gives a power law increase with S/W in the formula of Zqc/H=6.035(S/W)0.4959. In addition, triple plumes are found to establish self-similarity approximately at Z = 3H with S/W of 0.2 and at Z = 4.5H with S/W of 0.5. © 2018 Elsevier Ltd-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv-
dc.relation.ispartofBuilding and Environment-
dc.subjectMerging level-
dc.subjectQuasi-combined level-
dc.subjectSelf-similarity-
dc.subjectSource spacing-
dc.subjectSpatial structure-
dc.titleExperimental investigation of near-field stream-wise flow development and spatial structure in triple buoyant plumes-
dc.typeArticle-
dc.identifier.emailLi, Y: liyg@hku.hk-
dc.identifier.authorityLi, Y=rp00151-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.buildenv.2018.11.039-
dc.identifier.scopuseid_2-s2.0-85058185482-
dc.identifier.hkuros306619-
dc.identifier.volume149-
dc.identifier.spage79-
dc.identifier.epage89-
dc.publisher.placeUnited Kingdom-

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