Abstract
The Christiansen filter concept is used to visualize natural convection in porous media. Studies are conducted with both permeable and impermeable upper boundaries. The experimental results agree well with the numerical calculations which are based upon Darcy's law. Three different permeabilities as well as different test section aspect ratios (width/height) are examined. It is found that the aspect ratio of the cells does not vary with modified Rayleigh number for the impermeable upper boundary but this ratio increases significantly with modified Rayleigh number for the permeable upper boundary.
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