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RESEARCH PAPERS: Natural and Mixed Convection

Mixing Structure of Plane Self-Preserving Buoyant Turbulent Plumes

[+] Author and Article Information
R. Sangras, Z. Dai, G. M. Faeth

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

J. Heat Transfer 120(4), 1033-1041 (Nov 01, 1998) (9 pages) doi:10.1115/1.2825887 History: Received October 09, 1997; Revised June 26, 1998; Online December 05, 2007

Abstract

Measurements of the structure of plane buoyant turbulent plumes are described, emphasizing conditions in the fully developed (self-preserving) portion of the flow. Plumes were simulated using helium/air sources in a still and unstratified air environment. Mean and fluctuating mixture fractions were measured using laser-induced iodine fluorescence. Present measurements extended farther from the source (up to 155 source widths) and had more accurate specifications of plume buoyancy fluxes than past measurements and yielded narrower plume widths and different scaled mean and fluctuating mixture fractions near the plane of symmetry than previously thought. Measurements of probability density functions, temporal power spectra, and temporal integral scales of mixture fraction fluctuations are also reported.

Copyright © 1998 by The American Society of Mechanical Engineers
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