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Experimental study on contaminant entrainment in air distribution systems with free jets
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering. (Energy Systems)ORCID iD: 0000-0002-2171-3013
School of Technology and Business Studies, Dalarna University, Sweden. (Building technology)
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering. (Energy Systems)
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2017 (English)Conference paper, (Refereed)
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.

Place, publisher, year, edition, pages
2017.
Keyword [en]
Ambient entrainment, Jet development, PIV, Reynolds numbers.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hig:diva-24672OAI: oai:DiVA.org:hig-24672DiVA: diva2:1119553
Conference
Healthy Buildings 2017 EU
Available from: 2017-07-04 Created: 2017-07-04 Last updated: 2017-07-04

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf