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Experimental study on contaminant entrainment in air distribution systems with free jets
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem.ORCID-id: 0000-0002-2171-3013
School of Technology and Business Studies, Dalarna University, Sweden. (Building technology)
Högskolan i Gävle, Akademin för teknik och miljö, BMG-labbet.
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Healthy Buildings Europe 2017, ISIAQ , 2017, artikkel-id 0040Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

This is a preliminary study to an ongoing experimental and theoretical study of ambient entrainment of room air into axisymmetric free jets. The study herein aims to understanding characteristic behaviour of free jets, especially in low mixing ventilation technologies in order to get the best of such applications. In this paper, we explore the interaction of a free jet and its ambient, the effect on jet development, characteristics and behaviour at different Reynold numbers. Measurements were done with Particle Image Velocimetry (PIV) under isothermal conditions. As shown, at lower Reynolds numbers the jet is mostly laminar but is unstable consequently shortening the penetration distance into the ambient. As the Reynolds numbers increase the instability reduces and the penetration distance increases, but entrainment increases as vortices are generated closer to the nozzle exit. The current study suggests that’s further investigation is needed to define limits within which low and high mixing can be achieved with free jets, as this will have practical implications on optimization and implementation of free jets.

sted, utgiver, år, opplag, sider
ISIAQ , 2017. artikkel-id 0040
Emneord [en]
Ambient entrainment, Jet development, PIV, Reynolds numbers
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-24672Scopus ID: 2-s2.0-85053896607ISBN: 978-83-7947-232-1 (digital)OAI: oai:DiVA.org:hig-24672DiVA, id: diva2:1119553
Konferanse
HB2017-Europe, Healthy Buildings Europe 2017, 2-5 July 2017, Lublin, Poland
Merknad

Digital conference proceedings distributed to participants on USB.

Tilgjengelig fra: 2017-07-04 Laget: 2017-07-04 Sist oppdatert: 2018-10-15bibliografisk kontrollert

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Kabanshi, AlanLinden, ElisabetWigö, HansSandberg, Mats

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