0
RESEARCH PAPERS

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

Abstract

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
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In