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RESEARCH PAPERS

Wall Temperature and Prandtl Number Effects on Turbulent Boundary Layer Thicknesses and Shape Factors for Subsonic Compressible Gas Flow Over a Flat Plate

[+] Author and Article Information
W. J. Kelnhofer

The Catholic University of America, Department of Mechanical Engineering, Washington, D. C.

J. Eng. Power 91(4), 281-289 (Oct 01, 1969) (9 pages) doi:10.1115/1.3574748 History: Received December 31, 1968; Online August 25, 2011

Abstract

Based on n-power velocity and temperature profiles a method of computing various turbulent boundary layer thicknesses and shape factors affected by wall temperature and Prandtl number for fully developed subsonic gas flow over a flat plate is presented. Density variation in the boundary layer is given main consideration. Numerical computations include both heating and cooling of the gas. Boundary layer thicknesses and shape factors are shown to be significantly affected by wall temperature and to a lesser degree by Prandtl number. An experiment is described which involved air flow up to 30 m/sec over a flat plate maintained at constant wall temperatures up to 250 C. Comparisons between theory and experiment are good.

Copyright © 1969 by ASME
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