Heat Transfer and Friction in Channels With Two Opposite Rib-Roughened Walls

[+] Author and Article Information
J. C. Han

Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843

J. Heat Transfer 106(4), 774-781 (Nov 01, 1984) (8 pages) doi:10.1115/1.3246751 History: Received April 11, 1983; Online October 20, 2009


An experimental study of fully developed turbulent air flow in square ducts with two opposite rib-roughened walls was performed to determine the effects of the rib pitch-to-height and rib height-to-equivalent diameter ratios on friction factor and heat transfer coefficients with Reynolds number varied between 7000 and 90,000. Based on the four-sided, smooth-duct correlation and the four-sided, ribbed-duct similarity law, a general prediction method for average friction factor and average Stanton number in rectangular ducts with two smooth and two opposite ribbed walls was developed. There was good agreement between prediction and measurements. The results may be useful for gas turbine blade internal cooling design.

Copyright © 1984 by ASME
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