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Measurement of Entrainment into an Axisymmetric Jet using Temperature as a Tracer: A Pilot Study
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem. (Energy Systems)ORCID-id: 0000-0002-2171-3013
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem. (Energy Systems)
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energisystem. (Energy Systems)
2018 (engelsk)Inngår i: Excellent Indoor Climate and High Performing Ventilation / [ed] Risto Kosonen, Mervi Ahola and Jarkko Narvanne, 2018, s. 397-402Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

The current extended abstract is a pilot study of an ongoing experimental and theoretical investigation of ambient entrainment of room air into an axisymmetric free jet using temperature as a tracer. The project aims to investigate, by revisiting the concepts and fundamentals of axisymmetric free Jets and entrainment in ventilation applications, particularly focusing on how to optimize performance of low mixing air distribution systems and to test methods of measuring entrainment in such systems. The study aims to explore a scalar field method using temperature as a tracer to estimate entrainment in axisymmetric free Jets. The results obtained show jet characteristics that slightly differ from what is reported in velocity field measurements and other scalar field studies. Thus, a call is made herein for further investigations to understand entrainment and appropriate methods to determine jet characteristics and its mixing effect. Additionally, more studies are needed to verify whether earlier results are representative of entrainment conditions for low mixing ventilation systems whose operation mode depend on near-filed characteristics of jets.

sted, utgiver, år, opplag, sider
2018. s. 397-402
Emneord [en]
Entrainment, jets, near-field, passive tracer, temperature, delivery capacity
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-26849ISBN: 978-952-5236-48-4 (digital)OAI: oai:DiVA.org:hig-26849DiVA, id: diva2:1215137
Konferanse
Roomvent and Ventilation 2018, 2-5 June 2018, Aalto University, Espoo,Finland
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Tilgjengelig fra: 2018-06-07 Laget: 2018-06-07 Sist oppdatert: 2019-12-05bibliografisk kontrollert

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