Jet-crossflow experiments were performed in a water channel to determine the Reynolds number effects on the plume trajectory and entrainment coefficient. The purpose was to establish a lower limit down to which small scale laboratory experiments are accurate models of large scale atmospheric scenarios. Two models of a turbulent vertical surface jet (diameters and ) were designed and tested over a range of jet exit Reynolds numbers up to . The results show that from Reynolds number 200–4000 there is about a 40% increase in the entrainment coefficient, whereas from Reynolds number 4000–10,000, the increase in entrainment coefficient is only 2%. The conclusion is that Reynolds numbers significantly affect plume trajectories when the model Reynolds numbers are below 4000. Changing the initial turbulence in the exit flow from 12% to 2% without changing its mean velocity profile caused a less than one source diameter increase in the final plume rise.
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March 2007
Technical Papers
Small Scale Modeling of Vertical Surface Jets in Cross-Flow: Reynolds Number and Downwash Effects
K. Shahzad,
K. Shahzad
Department of Mechanical Engineering,
University of Alberta
, Edmonton, Alberta, Canada T6G 2G8
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B. A. Fleck,
B. A. Fleck
Department of Mechanical Engineering,
e-mail: brian.fleck@ualberta.ca
University of Alberta
, Edmonton, Alberta, Canada T6G 2G8
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D. J. Wilson
D. J. Wilson
Department of Mechanical Engineering,
University of Alberta
, Edmonton, Alberta, Canada T6G 2G8
Search for other works by this author on:
K. Shahzad
Department of Mechanical Engineering,
University of Alberta
, Edmonton, Alberta, Canada T6G 2G8
B. A. Fleck
Department of Mechanical Engineering,
University of Alberta
, Edmonton, Alberta, Canada T6G 2G8e-mail: brian.fleck@ualberta.ca
D. J. Wilson
Department of Mechanical Engineering,
University of Alberta
, Edmonton, Alberta, Canada T6G 2G8J. Fluids Eng. Mar 2007, 129(3): 311-318 (8 pages)
Published Online: August 3, 2006
Article history
Received:
February 8, 2006
Revised:
August 3, 2006
Citation
Shahzad, K., Fleck, B. A., and Wilson, D. J. (August 3, 2006). "Small Scale Modeling of Vertical Surface Jets in Cross-Flow: Reynolds Number and Downwash Effects." ASME. J. Fluids Eng. March 2007; 129(3): 311–318. https://doi.org/10.1115/1.2427084
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