Free-Stream Turbulence From a Circular Wall Jet on a Flat Plate Heat Transfer and Boundary Layer Flow

[+] Author and Article Information
R. MacMullin, W. Elrod

Air Force Institute of Technology, Wright-Patterson AFB, OH 45433

R. Rivir

Aero Propulsion Laboratory, Wright-Patterson AFB, OH 45433

J. Turbomach 111(1), 78-86 (Jan 01, 1989) (9 pages) doi:10.1115/1.3262240 History: Received July 15, 1987; Online November 09, 2009


The effects of the longitudinal turbulence intensity parameter of free-stream turbulence (FST) on heat transfer were studied using the aggressive flow characteristics of a circular tangential wall jet over a constant heat flux surface. Profile measurements of velocity, temperature, integral length scale, and spectra were obtained at downstream locations (2 to 20 x /D ) and turbulence intensities (7 to 18 percent). The results indicated that the Stanton number (St) and friction factor (C f ) increased with increasing turbulence intensity. The Reynolds analogy factor (2St/C f ) increased up to turbulence intensities of 12 percent, then became constant, and decreased after 15 percent. This factor was also found to be dependent on the Reynolds number (Rex ) and plate configuration. The influence of length scale, as found by previous researchers, was inconclusive at the conditions tested.

Copyright © 1989 by ASME
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