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 language | English |
|---|---|
| Pages (from-to) | 897-908 |
| Journal | International Journal of Heat and Fluid Flow |
| Volume | 31 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2010 |
| MoE publication type | A1 Journal article-refereed |
| Event | Sixth International Symposium on Turbulence, Heat and Mass Transfer - Rome, Italy Duration: 14 Sept 2009 → 18 Sept 2009 |
Keywords
- Attached plane jet
- Jet velocity
- PIV
- Turbulence intensity