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RESEARCH PAPERS: Forced Convection

The Investigation of Developing Flow and Heat Transfer in a Long Converging Duct

[+] Author and Article Information
K. R. Mutama, H. Iacovides

Department of Mechanical Engineering, University of Manchester Institute of Science and Technology, Manchester, M60 1QD, United Kingdom

J. Heat Transfer 115(4), 897-903 (Nov 01, 1993) (7 pages) doi:10.1115/1.2911385 History: Received March 01, 1992; Revised March 01, 1993; Online May 23, 2008

Abstract

The hydrodynamic and thermal development of turbulent boundary layers subjected to streamwise acceleration has been investigated. This was accomplished by obtaining detailed flow and temperature measurements over 52 entrance heights of a converging channel (with one wall heated) and with uniform velocity and temperature profiles at entry. Results are presented for three Reynolds numbers of 4000, 16,000, and 21,000 corresponding to acceleration parameter k levels of 2.31×10−6 , 5.78×10−7 , and 4.47×10−7 , respectively. At acceleration parameter levels of 2.3×10−6 the flow behaves in a laminarlike fashion in all respects. Even at an acceleration parameter level of 4.5×10−7 the skin friction coefficients and Stanton number values are well below those encountered in parallel channel flow at corresponding Reynolds numbers. The entry region behavior is further complicated by the combined effects of thin inlet boundary layers and streamwise acceleration. These entry effects are perhaps more obvious in the Stanton number development. The well-defined entry conditions make these detailed measurements suitable for turbulence model validation and refinement.

Copyright © 1993 by The American Society of Mechanical Engineers
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