RESEARCH PAPERS: Forced Convection

Holographic Interferometry Study of Spatially Periodic Heat Transfer in a Channel With Ribs Detached From One Wall

[+] Author and Article Information
Tong-Miin Liou, Wen-Bin Wang, Yuan-Jen Chang

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 30043

J. Heat Transfer 117(1), 32-39 (Feb 01, 1995) (8 pages) doi:10.1115/1.2822319 History: Received September 01, 1993; Revised April 01, 1994; Online December 05, 2007


The effects of clearance ratio (C/H) and Reynolds number (Re) on the turbulent heat transfer and friction in a rectangular duct with ribs detached from one wall were characterized quantitatively using laser holographic interferometry and pressure measurements. The investigated flow was periodic in space both hydrodynamically and thermally. C/H and Re were varied from 0.25 to 1.5 and 5 × 103 to 5 × 104 , respectively. The obtained interferograms, local (Nu) and average (Nu ) Nusselt number, and thermal performance (Nu p /Nus * ) allowed the critical C/H characterizing different mechanisms of heat transfer augmentation to be identified and allowed a comparison of Nu, Nu , and Nu p /Nus * among the detached ribbed duct, the attached ribbed duct, and the smooth duct to be made. It was found that the detached ribbed geometry has the advantage of eliminating the hot spots behind the attached ribs. Optimal clearance ratios for heat transfer enhancement between the present periodic detached ribs and previous single detached cylinder were also compared. Furthermore, compact heat transfer and friction correlations were developed for a detached ribbed duct for the first time.

Copyright © 1995 by The American Society of Mechanical Engineers
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