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RESEARCH PAPERS: Forced Convection

Local Heat Transfer in Rotating Smooth and Ribbed Two-Pass Square Channels With Three Channel Orientations

[+] Author and Article Information
S. Dutta

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

J.-C. Han

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

J. Heat Transfer 118(3), 578-584 (Aug 01, 1996) (7 pages) doi:10.1115/1.2822671 History: Received September 20, 1995; Revised March 01, 1996; Online December 05, 2007

Abstract

This paper presents experimental heat transfer results in a two-pass square channel with smooth and ribbed surfaces. The ribs are placed in a staggered half-V fashion with the rotation orthogonal to the channel axis. The channel orientation varies with respect to the rotation plane. A change in the channel orientation about the rotating frame causes a change in the secondary flow structure and associated flow and turbulence distribution. Consequently, the heat transfer coefficient from the individual surfaces of the two-pass square channel changes. The effects of rotation number on local Nusselt number ratio distributions are presented. Heat transfer coefficients with ribbed surfaces show different characteristics in rotation number dependency from those with smooth surfaces. Results show that staggered half-V ribs mostly have higher heat transfer coefficients than those with 90 and 60 deg continuous ribs.

Copyright © 1996 by The American Society of Mechanical Engineers
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