Convective heat transfer to an impinging air jet is known to yield high local and area averaged heat transfer coefficients. Such jets are of interest in the cooling of electronic components and of turbine blades and in manufacturing processes such as grinding. The current research is concerned with the measurement of heat transfer to an impinging air jet over a wide range of test parameters. These include Reynolds numbers, Re, from 10000 to 30000 and nozzle to impingement surface distance, H/D, from 0.5 to 8. The current research reports both mean and fluctuating heat transfer distributions up to 6 diameters from the geometric centre of the jet. The heat transfer results are compared to local velocity data. At low nozzle to impingement surface spacings the heat transfer distributions exhibit peaks at a radial location that varies with both Re and H/D. These peaks are shown to be due to an abrupt increase in turbulence in the wall jet boundary layer. At certain test configurations vortices that initiate in the shear layer impinge on the surface and move along the wall jet before being broken down into smaller scale turbulence. The effects of the vortical flow on the heat transfer mechanisms in an impinging jet flow are discussed.
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ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
July 17–22, 2005
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division and Electronic and Photonic Packaging Division
ISBN:
0-7918-4731-4
PROCEEDINGS PAPER
Impinging Jet Heat Transfer in the Transitional Wall Jet Region
Tadhg S. O’Donovan,
Tadhg S. O’Donovan
University of Dublin, Dublin, Ireland
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Darina B. Murray,
Darina B. Murray
University of Dublin, Dublin, Ireland
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Andrew A. Torrance
Andrew A. Torrance
University of Dublin, Dublin, Ireland
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Tadhg S. O’Donovan
University of Dublin, Dublin, Ireland
Darina B. Murray
University of Dublin, Dublin, Ireland
Andrew A. Torrance
University of Dublin, Dublin, Ireland
Paper No:
HT2005-72451, pp. 585-594; 10 pages
Published Online:
March 9, 2009
Citation
O’Donovan, TS, Murray, DB, & Torrance, AA. "Impinging Jet Heat Transfer in the Transitional Wall Jet Region." Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. Heat Transfer: Volume 1. San Francisco, California, USA. July 17–22, 2005. pp. 585-594. ASME. https://doi.org/10.1115/HT2005-72451
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