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RESEARCH PAPERS

Heat Transfer Augmentation in a Rectangular Channel With Slit Rib-Turbulators on Two Opposite Walls

[+] Author and Article Information
Jenn-Jiang Hwang

Department of Mechanical Engineering, Chung-Hua Polytechnic Institute, Hsinchu, Taiwan 30067

Tong-Miin Liou

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

J. Turbomach 119(3), 617-623 (Jul 01, 1997) (7 pages) doi:10.1115/1.2841167 History: Received February 04, 1995; Online January 29, 2008

Abstract

The effect of slit ribs on heat transfer and friction in a rectangular channel is investigated experimentally. The slit ribs are arranged in-line on two opposite walls of the channel. Three rib open-area ratios (β = 24, 37, and 46 percent), three rib pitch-to-height ratios (Pi/H = 10, 20, and 30), and two rib height-to-channel hydraulic diameter ratios (H/De = 0.081, and 0.162) are examined. The Reynolds number ranges from 10,000 to 50,000. Laser holographic interferometry is employed to measure the local heat transfer coefficients of the ribbed wall quantitatively, and observe the flow over the ribbed wall qualitatively. The results show that the slit rib has an advantage of avoiding “hot spots.” In addition, the heat transfer performance of the slit-ribbed channel is much better than that of the solid-ribbed channel. Semi-empirical correlations for friction and heat transfer are developed to account for rib spacings and open-area ratios. These correlations may be used in the design of turbine blade cooling passages.

Copyright © 1997 by The American Society of Mechanical Engineers
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