TY - JOUR
T1 - PIV measurement of the attached plane jet velocity field at a high turbulence intensity level in a room
AU - Cao, Guangyu
AU - Sivukari, Markku
AU - Kurnitski, Jarek
AU - Ruponen, Mika
PY - 2010/10
Y1 - 2010/10
N2 - 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.
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.
KW - Attached plane jet
KW - Jet velocity
KW - PIV
KW - Turbulence intensity
UR - http://www.scopus.com/inward/record.url?scp=77956060847&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatfluidflow.2010.04.008
DO - 10.1016/j.ijheatfluidflow.2010.04.008
M3 - Article
AN - SCOPUS:77956060847
VL - 31
SP - 897
EP - 908
JO - International Journal of Heat and Fluid Flow
JF - International Journal of Heat and Fluid Flow
SN - 0142-727X
IS - 5
ER -