年間 12 号発行
ISSN 印刷: 1091-028X
ISSN オンライン: 1934-0508
Indexed in
Effect of Variable Permeability and Viscous Dissipation on a Non-Darcy Natural-Convection Regime with Thermal Dispersion
要約
The effect of variable permeability on non-Darcy natural-convection flow along an isothermal vertical wall embedded in a saturated porous medium is initiated. The flow field is divided into a non-Darcy regime G → 0, an intermediate regime G = 0(1), and a limit Darcy regime G → ∞ using the inertia buoyancy scales. Thermal dispersion effects are also taken into consideration. The effect of viscous dissipation increases as we move from a non-Darcy to a limit Darcy regime. The effect of viscous dissipation in non-Darcy, intermediate, and limit Darcy regimes is studied with and without thermal dispersion for uniform and variable permeability. The results show a significant decrease in the heat transfer rate with the inclusion of viscous effect. It is seen that as the value of the dispersion parameter increases, the effect of viscous dissipation increases in all three regimes and the percentage decrease in the value of Nu/Rax1/4 increases with the value of G.
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Nield Donald A., Bejan Adrian, External Natural Convection, in Convection in Porous Media, 2013. Crossref