Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
The present study reports results of numerical
investigation of natural convection in a spherical annulus
filled with fluid saturated porous medium. The inner and
outer surfaces are maintained at low and high temperature
respectively. Successive Accelerated Replacement (SAR)
scheme has been employed to obtain numerical solution for
wide range of parameters i.e Rayleigh number
(100 Ra 2000) and aspect ratio (0.25 A 1.0). As Rayleigh
number and aspect ratio increase, the average Nusselt
number increases. The boundary layer formation takes place
at higher Rayleigh number. The centre of the stream lines
shift downwards as aspect ratio increases