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Near-Field Flow Structure and Entrainment of a Round Jet at Low Exit Velocities: Implications on Microclimate Ventilation
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.ORCID iD: 0000-0002-2171-3013
2020 (English)In: Computation, E-ISSN 2079-3197, Vol. 8, no 4, article id 100Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
MDPI , 2020. Vol. 8, no 4, article id 100
Keywords [en]
jet development; near-field flow structure; entrainment; mixing; delivery capacity; dilution capacity; microclimate ventilation
National Category
Mechanical Engineering
Research subject
Sustainable Urban Development
Identifiers
URN: urn:nbn:se:hig:diva-34338DOI: 10.3390/computation8040100ISI: 000601483800001Scopus ID: 2-s2.0-85097420215OAI: oai:DiVA.org:hig-34338DiVA, id: diva2:1502875
Available from: 2020-11-23 Created: 2020-11-23 Last updated: 2021-04-01Bibliographically approved

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10.3390/computation8040100(12926 kB)321 downloads
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Kabanshi, Alan

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Citation style
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