Transient, Laminar, Combined Free and Forced Convection in a Duct

[+] Author and Article Information
S. L. Zeiberg

Mechanical Engineering Department, City College of New York, New York, N. Y.

W. K. Mueller

Mechanical Engineering Department, New York University, New York, N. Y.

J. Heat Transfer 84(2), 141-148 (May 01, 1962) (8 pages) doi:10.1115/1.3684314 History: Received March 14, 1961


Transient, laminar, combined free and forced convection in a duct is analyzed under the assumptions of constant fluid properties, and fully developed flow. The transient heating is taken to be a result of wall temperature variations; the wall temperatures vary linearly with the axial co-ordinate of the duct (this is shown to be the only permissible axial dependence, other than no wall temperature variation in the axial direction). Numerical results show that for certain combinations of the Prandtl and Rayleigh numbers, an oscillatory approach to steady state exists. This phenomenon can induce a large reduction of the Nusselt number (compared to steady state) during the transient period.

Copyright © 1962 by ASME
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