An Interferometric Study of Combined Free and Forced Convection in a Horizontal Isothermal Tube

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

Canadian General Electric, Peterborough, Ont., Canada K9J 7B5

J. D. Tarasuk

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

J. Heat Transfer 103(2), 249-256 (May 01, 1981) (8 pages) doi:10.1115/1.3244449 History: Received September 22, 1980; Online October 20, 2009


A Mach-Zehnder interferometer was employed to determine the three-dimensional temperature field, and the circumferential and average Nusselt numbers for laminar flow of air in the entrance region of an isothermal horizontal tube where the velocity and the temperature profiles were developing simultaneously. The influence of free convection due to buoyancy on forced convection heat transfer was investigated. 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 to 46. The free convection increases, substantially, the average Nusselt number, by up to a factor of 2.0 from the analytical predictions, which account for forced convection only, near the tube inlet. Far from the tube inlet the free convection tends to decrease the average Nusselt number below the analytical predictions.

Copyright © 1981 by ASME
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