Natural Convection in Open-Ended Inclined Channels

[+] Author and Article Information
L. F. A. Azevedo, E. M. Sparrow

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

J. Heat Transfer 107(4), 893-901 (Nov 01, 1985) (9 pages) doi:10.1115/1.3247518 History: Received August 24, 1984; Online October 20, 2009


Heat transfer and flow visualization experiments were carried out in water to investigate the effect of inclination on natural convection in a parallel-walled channel. Parametric variations were also made of the dimensionless interwall spacing S/H , the mode of heating, and the wall-to-ambient temperature difference (i.e., the Rayleigh number Ras ). The heating modes included: (I) both walls heated and maintained at the same uniform temperature, (II) heating only from above, and (III) heating only from below. The Nusselt number results for top-heated channels inclined at an angle θ and for the vertical one-sided heated channel were perfectly correlated by the single parameter (S/H )Ras cosθ. On the other hand, the results for bottom-heated channels displayed a separate dependence on S/H , Ras , and θ. The Nusselt numbers for two-sided heating exceeded those for one-sided heating for vertical and moderately inclined channels, with a mixed trend at high inclinations. The global correlation Nus = 0.645[(S/H )Ras ]1/4 represented all the results within ±10 percent. Recirculation zones were present adjacent to the unheated wall of top-heated and one-sided heated channels. In the presence of heating from below, secondary flows in the form of longitudinal vortices existed above a threshold Rayleigh number.

Copyright © 1985 by ASME
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