Free-Stream Turbulence and Pressure Gradient Effects on Heat Transfer and Boundary Layer Development on Highly Cooled Surfaces

[+] Author and Article Information
K. Rued, S. Wittig

Lehrstuhl und Institut für Thermische Strömungsmaschinen, Universität Karlsruhe (T.H.), D-7500 Karlsruhe 1, West Germany

J. Eng. Gas Turbines Power 107(1), 54-59 (Jan 01, 1985) (6 pages) doi:10.1115/1.3239697 History: Received January 12, 1984; Online October 15, 2009


Heat transfer and boundary layer measurements were derived from flows over a cooled flat plate with various free-stream turbulence intensities (Tu = 1.6–11 percent), favorable pressure gradients (k = νe /ue 2 •due /dx = 0÷6•10−6 ) and cooling intensities (Tw /Te = 1.0–0.53). Special interest is directed towards the effects of the dominant parameters, including the influence on laminar to turbulent boundary layer transition. It is shown, that free-stream turbulence and pressure gradients are of primary importance. The increase of heat transfer due to wall cooling can be explained primarily by property variations as transition, and the influence of free-stream parameters are not affected.

Copyright © 1985 by ASME
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