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RESEARCH PAPERS

Analysis of Buoyancy Effect on Fully Developed Laminar Heat Transfer in a Rotating Tube

[+] Author and Article Information
R. Siegel

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

J. Heat Transfer 107(2), 338-344 (May 01, 1985) (7 pages) doi:10.1115/1.3247420 History: Received June 21, 1984; Online October 20, 2009

Abstract

Laminar heat transfer is analyzed in a tube rotating about an axis perpendicular to the tube axis. The solution applies for flow that is either radially outward from the axis of rotation, or radially inward toward the axis of rotation. The conditions are fully developed, and there is uniform heat addition at the tube wall. The analysis is performed by expanding velocities and temperature in power series using the Taylor number as a perturbation parameter. Coriolis and buoyancy forces caused by tube rotation are included, and the solution is calculated through second-order terms. The secondary flow induced by the Coriolis terms always tends to increase the heat transfer coefficient; this effect can dominate for small wall heating. For radial inflow, buoyancy also tends to improve heat transfer. For radial outflow, however, buoyancy tends to reduce heat transfer; for large wall heating this effect can dominate, and there is a net reduction in heat transfer coefficient.

Copyright © 1985 by ASME
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