The impact of the fluid layer thickness on the onset of transient convection in porous media

Abstract EN

The satisfactory performance of porous media as insulation in industrial applications depends upon the thermal properties of both the fluid and solid phases.

Simulation of macroscopic of the onset of transient convection in porous media was proposed for a semi-infinite saturated porous media (glasswater) with heating from below as a boundary condition.

Effective thermal properties have been affected directly in the calculation of macroscopic model of heat transfer rate.

Through this model was simulated the onset natural convection by calculated the transient convection of heat transfer coefficient between the top surface layer of solid phase and the bulk temperature of fluid phase by two values of heat flux at different void space of fluid layer.

Also, Nusselt number and Rayleigh number of porous media were calculated at different interval times of heating.