Natural Convection and Conduction in Porous Wall, Solar Collector Systems Without Vents

[+] Author and Article Information
M. Mbaye, E. Bilgen

Ecole Polytechnique, Montreal, Quebec H3C 3A7, Canada

J. Sol. Energy Eng 114(1), 40-46 (Feb 01, 1992) (7 pages) doi:10.1115/1.2929980 History: Received December 01, 1990; Revised June 15, 1991; Online June 06, 2008


Steady natural convection heat transfer has been studied in porous wall, solar collector systems. The boundary conditions were: two isothermal walls at different temperatures, two horizontal bounding adiabatic walls, and either uniform or nonuniform heat generating porous layer without vents. The aspect ratio A was from 0.5 to 1.4. The Rayleigh number varied from 103 to 108 . The Darcy number was from 10−8 to 10−2 but the detailed studies were carried out only for 10−4 , an optimum value. The results are presented in terms of thermal parameters (θ, θmax , Nu) as a function of Ra and other nondimensional parameters (A=H/L, B=1/L, F=d/L, kr ). The isotherms and streamlines within the system are also produced. The overall results indicate that geometrical parameters are the most important parameters affecting the system performance.

Copyright © 1992 by The American Society of Mechanical Engineers
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