An autonomous system for thermal convection of viscoelastic fluids in a porous layer using a thermal nonequilibrium model

Abstract

Thermal convection of viscoelastic fluids saturating a horizontal porous layer heated from below is analyzed using a thermal nonequilibrium model to take account of the interphase heat transfer between the fluid and the solid. The viscoelastic character of the flow is considered by a modified Darcy’s law. An autonomous system with five differential equations is deduced by applying the truncated Galerkin expansion to the momentum and heat transfer equations. The effects of interphase heat transfer H on the thermal convection of viscoelastic fluids in a porous medium are analyzed and discussed. The results show that the weak interphase heat transfer tends to stabilize the steady convection.

Keywords

thermal convection / porous media / viscoelastic fluid / thermal nonequilibrium model

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Higher Education Press and Springer-Verlag Berlin Heidelberg