Turbulent Heat Transfer Augmentation and Friction in Periodic Fully Developed Channel Flows

[+] Author and Article Information
T.-M. Liou, J.-J. Hwang

Power Mechanical Engineering Department, National Tsing Hua University, Taiwan

J. Heat Transfer 114(1), 56-64 (Feb 01, 1992) (9 pages) doi:10.1115/1.2911267 History: Received July 16, 1990; Revised April 01, 1991; Online May 23, 2008


Measurements are presented of the distribution of average friction factors (f) as well as local and average (Nu ) heat transfer coefficients for fully developed channel flows with two rib-roughened opposite walls. The temperature measurements were made by using both a laser holographic interferometer and thermocouples. In addition, the reattachment length was determined by flow visualization. The Reynolds number (Re) was varied from 5.0 × 103 to 5.4 × 104 ; the rib pitch-to-height ratios (Pi/H) were 10, 15, and 20; and the rib height-to-hydraulic diameter ratios (H/De) were 0.063, 0.081, and 0.106. The detailed results allowed the peaks of heat transfer augmentation and the regions susceptible to hot spots to be located and allowed the relative contribution of the rib surface and the channel wall to the heat transfer augmentation to be determined. Moreover, relative to a smooth duct, the enhancement of both Nu and f at various Re, Pi/H, and H/De was documented in detail. Furthermore, compact correlations in terms of Re, Pi/H, and H/De were developed for both Nu and f.

Copyright © 1992 by The American Society of Mechanical Engineers
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