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RESEARCH PAPERS: Forced Convection

Influence of Turbulence Parameters, Reynolds Number, and Body Shape on Stagnation-Region Heat Transfer

[+] Author and Article Information
G. J. Van Fossen, R. J. Simoneau

NASA Lewis Research Center, Cleveland, OH 44135

C. Y. Ching

Syracuse University, Syracuse, NY

J. Heat Transfer 117(3), 597-603 (Aug 01, 1995) (7 pages) doi:10.1115/1.2822619 History: Received April 01, 1994; Revised November 01, 1994; Online December 05, 2007

Abstract

This experiment investigated the effects of free-stream turbulence intensity, length scale, Reynolds number, and leading-edge velocity gradient on stagnation-region heat transfer. Heat transfer was measured in the stagnation region of four models with elliptical leading edges downstream of five turbulence-generating grids. Stagnation-region heat transfer augmentation increased with decreasing length scale but ann optimum scale was not found. A correlation was developed that fit heat transfer data for isotropic turbulence to within ±4 percent but did not predict data for anisotropic turbulence. Stagnation heat transfer augmentation caused by turbulence was unaffected by the velocity gradient. The data of other researchers compared well with the correlation. A method of predicting heat transfer downstream of the stagnation point was developed.

Copyright © 1995 by The American Society of Mechanical Engineers
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