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Effect of Temperature Ratio on Jet Array Impingement Heat Transfer

[+] Author Affiliations
Matt Goodro, Jongmyung Park

University of Utah, Salt Lake City, UT

Phil Ligrani

University of Oxford, Oxford, Oxfordshire, UK

Mike Fox, Hee-Koo Moon

Solar Turbines, Inc., San Diego, CA

Paper No. GT2007-28293, pp. 977-989; 13 pages
doi:10.1115/GT2007-28293
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4793-4 | eISBN: 0-7918-3796-3
  • Copyright © 2006 by ASME

abstract

Considered are the effects of temperature ratio on the heat transfer from an array of jets impinging on a flat plate. At constant Reynolds number of 18000, and constant Mach number of 0.2, different ratios of target plate temperature to jet temperature are employed. The spacing between holes in the streamwise direction X is 8D, and the spanwise spacing between holes in a given streamwise row Y is also 8D. The target plate is located 3D away from the impingement hole exits. Experimental results show that local, line-averaged, and spatially-averaged Nusselt numbers decrease as the Tw/Tj temperature ratio increases. This is believed to be due to the effects of temperature-dependent fluid properties, as they affect local and global turbulent transport in the flow field created by the array of impinging jets. The effect of temperature ratio on crossflow-to-jet mass velocity ratio and discharge coefficients are also examined.

Copyright © 2006 by ASME

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