Turbulent Heat Transport in a Circular Duct With a Narrow Strip Heat Flux Boundary Condition

[+] Author and Article Information
J. W. Baughn, C. A. Dingus, M. A. Hoffman

University of California, Davis, CA 95616

B. E. Launder

University of Manchester, Manchester, United Kingdom

J. Heat Transfer 111(4), 864-869 (Nov 01, 1989) (6 pages) doi:10.1115/1.3250798 History: Received November 23, 1987; Revised December 21, 1988; Online October 20, 2009


Experiments and computations have been performed for turbulent air flow in a circular duct in which uniform heating is applied over a 60 deg arc of the circumference. The results are compared to those for both a uniform heat flux around the full circumference of the duct and for a uniform heat flux around half the circumference. The flow was hydrodynamically fully developed at the start of heating and there were negligible buoyancy effects. Both the experimental results and the computations show that the local heat transfer coefficients for the narrow strip (60 deg wide) are less than the values for uniform heating around the full circumference but greater than the values for uniform heating around half the circumference (180 deg). This rather surprising result is a consequence of the temperature distribution in the fluid and the definition of the local heat transfer coefficient, which is based on the bulk temperature.

Copyright © 1989 by ASME
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