Free Convection Effects on Laminar Forced Convective Heat Transfer in a Horizontal Isothermal Tube

[+] Author and Article Information
W. W. Yousef

Nuclear Studies and Safety Department, Ontario Hydro, Toronto, Ontario, Canada M5G 1X6

J. D. Tarasuk

The University of Western Ontario, London, Ontario, Canada N6A 5B9

J. Heat Transfer 104(1), 145-152 (Feb 01, 1982) (8 pages) doi:10.1115/1.3245042 History: Received February 12, 1981; Online October 20, 2009


The influence of free convection due to buoyancy on forced laminar flow of air in the entrance region of a horizontal isothermal tube was investigated. The Graetz numbers ranged form 2.5 to 110.0, the Reynolds numbers ranged from 120 to 1200, the Grashof numbers ranged from 0.8 × 104 to 8.7 × 104 , and the ratio L/D was varied from 6 up to 46. The average Nusselt numbers based on the log-mean temperature difference, ranged from 2.0 to 25.9. The heat transfer data were correlated according to the influence of free convection which was found to have a significant effect at points close to the entrance to the tube.

Copyright © 1982 by ASME
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