PIV measurement of the attached plane jet velocity field at a high turbulence intensity level in a room

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

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

The behaviour of an attached plane jet at high turbulence intensity (>20%) is not completely understood, especially at relatively low Reynolds numbers (<2000) in a room. This study focuses on the detailed mean and instantaneous jet flow field using the particle image velocimetry (PIV) measurement technique in a full-scale climate chamber. Three isothermal conditions at different Reynolds numbers based on the jet slot height and slot average velocity, 960, 1320 and 1680, were measured, having a turbulence intensity of 44%, 30% and 22%, respectively. The results show that the measured jet velocity was able to match the earlier empirical turbulent jet results when the turbulence intensity was of the order of 40%. Incomplete self-similarity occurs when the turbulence intensity is less than 30%. After a few slot heights downstream from the jet slot, most of the data of the jet at the Reynolds number 960 present self-similarity characteristics.
Original languageEnglish
Pages (from-to)897-908
JournalInternational Journal of Heat and Fluid Flow
Volume31
Issue number5
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed
EventSixth International Symposium on Turbulence, Heat and Mass Transfer - Rome, Italy
Duration: 14 Sep 200918 Sep 2009

Fingerprint

particle image velocimetry
Velocity measurement
rooms
Turbulence
slots
velocity distribution
turbulence
Reynolds number
turbulent jets
jet flow
low Reynolds number
climate
flow distribution
chambers
Flow fields

Keywords

  • Attached plane jet
  • Jet velocity
  • PIV
  • Turbulence intensity

Cite this

Cao, Guangyu ; Sivukari, Markku ; Kurnitski, Jarek ; Ruponen, Mika. / PIV measurement of the attached plane jet velocity field at a high turbulence intensity level in a room. In: International Journal of Heat and Fluid Flow. 2010 ; Vol. 31, No. 5. pp. 897-908.
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abstract = "The behaviour of an attached plane jet at high turbulence intensity (>20{\%}) is not completely understood, especially at relatively low Reynolds numbers (<2000) in a room. This study focuses on the detailed mean and instantaneous jet flow field using the particle image velocimetry (PIV) measurement technique in a full-scale climate chamber. Three isothermal conditions at different Reynolds numbers based on the jet slot height and slot average velocity, 960, 1320 and 1680, were measured, having a turbulence intensity of 44{\%}, 30{\%} and 22{\%}, respectively. The results show that the measured jet velocity was able to match the earlier empirical turbulent jet results when the turbulence intensity was of the order of 40{\%}. Incomplete self-similarity occurs when the turbulence intensity is less than 30{\%}. After a few slot heights downstream from the jet slot, most of the data of the jet at the Reynolds number 960 present self-similarity characteristics.",
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PIV measurement of the attached plane jet velocity field at a high turbulence intensity level in a room. / Cao, Guangyu (Corresponding Author); Sivukari, Markku; Kurnitski, Jarek; Ruponen, Mika.

In: International Journal of Heat and Fluid Flow, Vol. 31, No. 5, 2010, p. 897-908.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Kurnitski, Jarek

AU - Ruponen, Mika

PY - 2010

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AB - The behaviour of an attached plane jet at high turbulence intensity (>20%) is not completely understood, especially at relatively low Reynolds numbers (<2000) in a room. This study focuses on the detailed mean and instantaneous jet flow field using the particle image velocimetry (PIV) measurement technique in a full-scale climate chamber. Three isothermal conditions at different Reynolds numbers based on the jet slot height and slot average velocity, 960, 1320 and 1680, were measured, having a turbulence intensity of 44%, 30% and 22%, respectively. The results show that the measured jet velocity was able to match the earlier empirical turbulent jet results when the turbulence intensity was of the order of 40%. Incomplete self-similarity occurs when the turbulence intensity is less than 30%. After a few slot heights downstream from the jet slot, most of the data of the jet at the Reynolds number 960 present self-similarity characteristics.

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