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RESEARCH PAPERS

Surface Curvature Effect on Slot-Air-Jet Impingement Cooling Flow and Heat Transfer Process

[+] Author and Article Information
C. Gau, C. M. Chung

Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 700

J. Heat Transfer 113(4), 858-864 (Nov 01, 1991) (7 pages) doi:10.1115/1.2911214 History: Received August 06, 1990; Revised March 07, 1991; Online May 23, 2008

Abstract

Experiments are performed to study surface curvature effects on the impingement cooling flow and the heat transfer processes over a concave and a convex surface. A single air jet issuing from different size slots continuously impinges normally on the concave side or the convexside of a heated semicylindrical surface. An electrical resistance wire is used to generate smoke, which allows us to visualize the impinging flow structure. The local heat transfer Nusselt number along the surfaces is measured. For impingement on a convex surface, three-dimensional counterrotating vortices on the stagnation point are initiated, which result in the enhancement of the heat transfer process. For impingement on a concave surface, the heat transfer Nusselt number increases with increasing surface curvature, which suggests the initiation of Taylor–Görtler vortices along the surface. In the experiment, the Reynolds number ranges from 6000 to 350,000, the slot-to-plate spacing from 2 to 16, and the diameter-to-slot-width ratio D/b from 8 to 45.7. Correlations of both the stagnation point and the average Nusselt number over the curved surface, which account for the surface curvature effect, are presented.

Copyright © 1991 by The American Society of Mechanical Engineers
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