RESEARCH PAPERS: Forced Convection

Unsteady Heat Transfer in Baffled Channels

[+] Author and Article Information
G. Wang, K. Stone, S. P. Vanka

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

J. Heat Transfer 118(3), 585-591 (Aug 01, 1996) (7 pages) doi:10.1115/1.2822672 History: Received May 10, 1995; Revised April 22, 1996; Online December 05, 2007


In this paper, the enhancement of heat transfer due to unsteady flow in channels with in-line and staggered baffles is investigated through the numerical solution of the governing unsteady fluid flow and energy equations with periodicity in the stream wise direction. For the inline configuration, the flow becomes naturally unsteady at a critical Reynolds number (Q/v ) around 110. For the staggered case, this value is around 200. Significant increases in heat transfer rate are observed once the flow becomes unsteady. Results for several Reynolds numbers up to 500 are presented. The present results can be valuable to the design and operation of compact heat exchangers used in process industry.

Copyright © 1996 by The American Society of Mechanical Engineers
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