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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

CONVEX CURVATURE EFFECTS ON THE HEATED TURBULENT BOUNDARY LAYER

Get access (open in a dialog) DOI: 10.1615/IHTC7.1870
pages 295-300

Résumé

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.