RT Journal Article ID 5ed353c90358fd40 A1 Hassanien, I. A. A1 Omer, Gh. M. T1 Mixed-Convection Flow Adjacent to a Horizontal Surface in a Porous Medium with Variable Permeability and Surface Heat Flux JF Journal of Porous Media JO JPM YR 2005 FD 2005-04-01 VO 8 IS 2 SP 225 OP 235 AB A nonsimilarity solution for mixed convection from impermeable horizontal surfaces in a saturated porous medium incorporating variation of permeability and thermal conductivity due to packing of particles is obtained for the case of variable heat flux in the form qw(x) = bxn. To cover the entire mixed-convection regime, two different transformations are used. In the first transformation the nonsimilarity parameter ζf= Rax⁄Pex2 is found to measure the buoyancy effect in the forced-flow-dominated mixed-convection regime, and in the second transformation the nonsimilarity parameter ζn = Rax⁄Pex1⁄2 is found to measure the forced-flow effect in the buoyancy-dominated mixed-convection regime. The two solutions provide results that cover the entire mixed-convection regime from pure forced- to pure free-convection limit. Numerical results for different values of surface heat flux variation, permeability K, and thermal diffusivity α are presented. PB Begell House LK https://www.dl.begellhouse.com/journals/49dcde6d4c0809db,626bf35d4b7650f9,5ed353c90358fd40.html