Effectiveness and Heat Transfer for a Turbulent Boundary Layer With Tangential Injection and Variable Free-Stream Velocity

[+] Author and Article Information
R. A. Seban

Mechanical Engineering, University of California, Berkeley, Calif.

L. H. Back

University of California, Berkeley, Calif.

J. Heat Transfer 84(3), 235-242 (Aug 01, 1962) (8 pages) doi:10.1115/1.3684348 History: Received July 27, 1961


The effectiveness and the heat transfer have been measured in a system involving the tangential injection of air from a single spanwise slot into the turbulent boundary layer of an external air stream, with the velocity of the external stream increasing in a way that concentrated the acceleration in a region downstream of the initial mixing zone. The effectiveness was changed but little from the value that would have existed had the free-stream velocity remained at its initial value and both temperature profiles and analytical considerations show that this invariability of the effectiveness is associated with thermal boundary-layer thicknesses that are much larger than the hydrodynamic thicknesses. Heat-transfer coefficients are shown to be predictable from existing information provided that the momentum thickness Reynolds number is large enough.

Copyright © 1962 by ASME
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