:Relation between the mode of convection and the size of heat source

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Two-dimensional numerical calculations are reported for steady state natural convection of a fluid in a horizontal porous layer with a permeable upper surface and with an impermeable lower surface. Numerical results are obtained for temperature and stream-function in the porous layer characterized by two heating conditions; one is with a constant temperature lower surface and the other with a constant heat flux lower surface locally. Relations among the pattern of convective flow in the porous layer, the aspect ratio of the heat source, and the discharges of the fluid and heat from the upper surface are discussed.
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