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RESEARCH PAPERS

Forced Convective Heat Transfer in Curved Diffusers

[+] Author and Article Information
J. Rojas, J. H. Whitelaw

Imperial College of Science and Technology, Mechanical Engineering Department, Fluids Section, London SW7 2BX, England

M. Yianneskis

King’s College London, Mechanical Engineering Department, London WC2R 2LS, England

J. Heat Transfer 109(4), 866-871 (Nov 01, 1987) (6 pages) doi:10.1115/1.3248196 History: Received June 30, 1986; Online October 20, 2009

Abstract

Measurements of the velocity characteristics of the flows in two curved diffusers of rectangular cross section with C and S -shaped centerlines are presented and related to measurements of wall heat transfer coefficients along the heated flat walls of the ducts. The velocity results were obtained by laser-Doppler anemometry in a water tunnel and the heat transfer results by liquid crystal thermography in a wind tunnel. The thermographic technique allowed the rapid and inexpensive measurement of wall heat transfer coefficents along flat walls of arbitrary boundary shapes with an accuracy of about 5 percent. The results show that an increase in secondary flow velocities near the heated wall causes an increase in the local wall heat transfer coefficient, and quantify the variation for maximum secondary-flow velocities in a range from 1.5 to 17 percent of the bulk flow velocity.

Copyright © 1987 by ASME
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