Turbulent Boundary Layer Heat Transfer Experiments: A Separate Effects Study on a Convexly Curved Wall

[+] Author and Article Information
T. W. Simon

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn. 55455

R. J. Moffat

Department of Mechanical Engineering, Stanford University, Stanford, Calif.

J. Heat Transfer 105(4), 835-840 (Nov 01, 1983) (6 pages) doi:10.1115/1.3245670 History: Received February 16, 1982; Online October 20, 2009


Measured heat transfer rates through turbulent and transitional boundary layers on an isothermal, convexly curved wall show Stanton numbers 20–50 percent below flat wall values. Recovery is slow on a flat wall downstream of the curve; after 60 cm, Stanton numbers were 15–20 percent below flat wall values. Five secondary effects were studied: (i) initial boundary layer thickness, (ii) free-stream velocity, (iii) free-stream acceleration, (iv) unheated starting length, and (v) transition. Regardless of the initial state, curvature without acceleration eventually forced the boundary layer into an asymptotic condition: StαRe Δ2 −1 . Strong acceleration with curvature brought the exponent on ReΔ2 to −2.

Copyright © 1983 by ASME
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