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Near-Field Flow Structure and Entrainment of a Round Jet at Low Exit Velocities: Implications on Microclimate Ventilation
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik.ORCID-id: 0000-0002-2171-3013
2020 (engelsk)Inngår i: Computation, E-ISSN 2079-3197, Vol. 8, nr 4, artikkel-id 100Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper explores the flow structure, mean/turbulent statistical characteristics of the vector field and entrainment of round jets issued from a smooth contracting nozzle at low nozzle exit velocities (1.39–6.44 m/s). The motivation of the study was to increase understand of the near field and get insights on how to control and reduce entrainment, particularly in applications that use jets with low-medium momentum flow like microclimate ventilation systems. Additionally, the near field of free jets with low momentum flow is not extensively covered in literature. Particle image velocimetry (PIV), a whole field vector measurement method, was used for data acquisition of the flow from a 0.025 m smooth contracting nozzle. The results show that at low nozzle exit velocities the jet flow was unstable with oscillations and this increased entrainment, however, increasing the nozzle exit velocity stabilized the jet flow and reduced entrainment. This is linked to the momentum flow of the jet, the structure characteristics of the flow and the type or disintegration distance of vortices created on the shear layer. The study discusses practical implications on microclimate ventilation systems and at the same time contributes data to the development and validation of a planned computational turbulence model for microclimate ventilation.

sted, utgiver, år, opplag, sider
MDPI , 2020. Vol. 8, nr 4, artikkel-id 100
Emneord [en]
jet development; near-field flow structure; entrainment; mixing; delivery capacity; dilution capacity; microclimate ventilation
HSV kategori
Forskningsprogram
Hållbar stadsutveckling
Identifikatorer
URN: urn:nbn:se:hig:diva-34338DOI: 10.3390/computation8040100ISI: 000601483800001Scopus ID: 2-s2.0-85097420215OAI: oai:DiVA.org:hig-34338DiVA, id: diva2:1502875
Tilgjengelig fra: 2020-11-23 Laget: 2020-11-23 Sist oppdatert: 2021-04-01bibliografisk kontrollert

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10.3390/computation8040100(12926 kB)322 nedlastinger
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Kabanshi, Alan

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