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RESEARCH PAPERS

Structure of Turbulent Adiabatic Wall Plumes

[+] Author and Article Information
M.-C. Lai, S.-M. Jeng, G. M. Faeth

Department of Aerospace Engineering, The University of Michigan, Ann Arbor, MI 48109-2140

J. Heat Transfer 108(4), 827-834 (Nov 01, 1986) (8 pages) doi:10.1115/1.3247019 History: Received March 15, 1985; Online October 20, 2009

Abstract

Weakly buoyant turbulent wall plumes were studied for surfaces inclined 0–62 deg from the vertical (stable orientation). The source of buoyancy was carbon dioxide/air mixtures in still air, assuring conserved buoyancy flux. Profiles of mean and fluctuating concentrations and streamwise velocities were measured at several stations along the wall. Flow structure was also observed by Mie scattering from a laser light sheet. Tests with inclined walls showed that low levels of ambient stratification caused the wall plumes to entrain fluid in the horizontal direction, rather than normal to the wall. Structure predictions were made for vertical wall plumes, considering Favre-averaged mixing-length and k –ε–g models of turbulence. Both methods yielded encouraging predictions of flow structure, in spite of the presence of large-scale coherent turbulent structures observed in the flow visualization.

Copyright © 1986 by ASME
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