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Experimental invest...
Experimental investigation of near-field stream-wise flow development and spatial structure in triple buoyant plumes
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- Yin, Shi (författare)
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR, China
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- Li, Yuguo (författare)
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR, China
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- Fan, Yifan (författare)
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR, China
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- Sandberg, Mats, 1945- (författare)
- Högskolan i Gävle,Energisystem och byggnadsteknik
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(creator_code:org_t)
- Elsevier Ltd, 2019
- 2019
- Engelska.
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Ingår i: Building and Environment. - : Elsevier Ltd. - 0360-1323 .- 1873-684X. ; 149, s. 79-89
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- This 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Nyckelord
- Merging level
- Quasi-combined level
- Self-similarity
- Source spacing
- Spatial structure
- Stream-wise flow development
- Merging
- Velocity
- Velocity measurement
- Flow development
- Self-similarities
- Buoyancy
- Hållbar stadsutveckling
- Sustainable Urban Development
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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