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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)


Terrence W. Simon
Department of Mechanical Engineering, University of Minnesota, 111 Church St. S.E., Minneapolis, Minnesota 55455, USA

Robert J. Moffat
Thermosciences Division of Mechanical Engineering Stanford University, Stanford, CA 94305, USA

DOI: 10.1615/IHTC7.1870
pages 295-300


Wall heat transfer rates and profiles of mean velocity and temperature were measured for a turbulent boundary layer flow on a heated, isothermal, convexly curved wall of 45 cm radius of curvature. For the base case the ratio of boundary layer thickness to radius of curvature, δ(99)/R, was 0.10. Some data was also presented for a comparison case of δ(99)/R = 0.05. Curvature effects were significant. In the curved region, the Stanton numbers and skin friction coefficients were reduced by 35-40 percent below flat plate values for the same momentum or enthalpy thickness Reynolds numbers, and recovered slowly on a flat wall downstream of the curved wall. After 60 cm, Stanton numbers and skin friction coefficients were still 15-25 percent below flat-wall values. Profiles of mean velocity and temperature show a more rapid growth of the wake regions and a shortening of the log-linear region as a result of curvature. Recovery of the profiles is slow and by propagation outward from the wall. Turbulent Prandtl numbers, deduced from the mean temperature profiles assuming a thermal law of the wall, were increased 40-50 percent by this strong convex curvature.

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