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RESEARCH PAPERS: Heat Exchangers

A Complementary Experimental and Numerical Study of the Flow and Heat Transfer in Offset Strip-Fin Heat Exchangers

[+] Author and Article Information
N. C. DeJong, L. W. Zhang, A. M. Jacobi

Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, IL 61801

S. Balachandar

Department of Theoretical and Applied Mechanics, University of Illinois, Urbana, IL 61801

D. K. Tafti

National Center for Supercomputing Applications, University of Illinois, Urbana, IL 61801

J. Heat Transfer 120(3), 690-698 (Aug 01, 1998) (9 pages) doi:10.1115/1.2824338 History: Received August 01, 1997; Revised April 13, 1998; Online December 05, 2007

Abstract

A detailed analysis of experimental and numerical results for flow and heat transfer in similar offset strip-fin geometries is presented. Surface-average heat transfer and pressure drop, local Nusselt numbers and skin friction coefficients on the fin surface, instantaneous flow structures, and local time-averaged velocity profiles are contrasted for a range of Reynolds numbers using both prior and new experimental and numerical results. This contrast verifies that a two-dimensional unsteady numerical simulation captures the important features of the flow and heat transfer for a range of conditions. However, flow three-dimensionality appears to become important for Reynolds numbers greater than about 1300, and thermal boundary conditions are important for Reynolds numbers below 1000. The results indicate that boundary layer development, flow separation and reattachment, wake formation, and vortex shedding are all important in this complex geometry.

Copyright © 1998 by The American Society of Mechanical Engineers
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