Combined Free and Forced Convection in Vertical Tubes with Radial Internal Fins

[+] Author and Article Information
C. Prakash, S. V. Patankar

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Heat Transfer 103(3), 566-572 (Aug 01, 1981) (7 pages) doi:10.1115/1.3244503 History: Received October 07, 1980; Online October 20, 2009


An analysis is made of the fully developed laminar flow and heat transfer in vertical tubes with radial internal fins to determine the influence of the buoyancy forces. The governing equations for velocity and temperature are solved by a finite difference technique which incorporates a special scheme for treating the two coupled variables. Results are presented for a range of the Rayleigh number and for various values of the fin height and the number of fins. The buoyancy force is found to increase significantly both friction and heat transfer in the finned tube; augmentation factors in the range of 5 to 10 are encountered. The effect of buoyancy is particularly strong when the number of fins is small and the fins are short.

Copyright © 1981 by ASME
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