Particle Image Velocimetry (PIV) application in the measurement of indoor air distribution by an active chilled beam

Guangyu Cao (Corresponding Author), Markku Sivukari, Jarek Kurnitski, Mika Ruponen, Olli Seppänen

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)


We study the turbulent air flow behaviours of the attached plane jet discharged from an active chilled beam in a room using Particle Image Velocimetry (PIV). PIV is an innovative technology to study indoor air flow which began in the eighties of the last century for the measurement of whole air flow fields in fractions of a second. Here an experimental PIV system was built to reveal the structure of a turbulent attached plane jet in the entrainment process of the ambient air downstream from the jet slot. For the particle seeding in the PIV experiments, a few different particles were tested with the attached jet PIV application in a room. The results presented in this paper show the clear structure of the turbulent attached plane jet in the entrainment process after issuing from the chilled beam slot. The PIV visualisation results proved that the jet will attach to the ceiling and become fully turbulent a short distance downstream from the slot. The jet velocity vector fields show that the volume flow rate of the attached plane jet increases because of the large vortex mixing mechanism in the outer region of the jet. In three measurement cases, the air jet grows faster at a Reynolds number of 960 than at Reynolds numbers of 1320 and 1680. The calculated spreading angles in the cases with lower Reynolds numbers have similar values compared with the visualisation results.
Original languageEnglish
Pages (from-to)1932-1940
JournalBuilding and Environment
Issue number9
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed
EventROOMVENT 2009 - Busan, Korea, Republic of
Duration: 24 May 200927 May 2009
Conference number: 11



  • Attached plane jet
  • Particle image velocimetry
  • Reynolds number
  • Turbulent flow
  • Vector field
  • Visualisation

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