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Experimental Investigation on Staggered Impingement Heat Transfer on a Rib Roughened Plate With Different Crossflow Schemes

[+] Author Affiliations
Yunfei Xing, Bernhard Weigand

Universität Stuttgart, Stuttgart, Germany

Paper No. GT2010-22043, pp. 1-11; 11 pages
doi:10.1115/GT2010-22043
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4399-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

A nine-by-nine staggered jet array impinging on a flat or rib roughened plate at Reynolds numbers from 15,000 to 35,000 has been studied by the transient liquid crystal method. The jet-to-plate spacings are adjusted to be 3, 4 and 5 jet diameters. Three jet-induced crossflow schemes, referred as minimum, medium and maximum crossflow correspondingly, have been measured. The local air jet temperature is measured at several positions on the impingement plate to account for an appropriate reference temperature of the heat transfer coefficient. The heat transfer results of the rib roughened plate are compared with those of the flat plate. The best heat transfer performance is obtained with the minimum crossflow and narrow jet-to-plate spacing no matter on a flat or roughened plate. The presence of rib turbulators on the target plate produce higher heat transfer coefficients than the flat plate for narrow jet-to-plate spacing by 7.5%. Note that this value is within the measurement uncertainty of 9%.

Copyright © 2010 by ASME
Topics: Heat transfer

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