Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.
Packed bed studies have been carried out to estimate
effective thermal conductivity and wall-to-bed
interfacial heat transfer coefficient using comparative
method. Heat transfer in packed bed has contributions
from conduction, convection from gas phase and interparticle
radiation. To separate the effect of convection,
experiments have been carried out in air as well as in
vacuum. The convective contribution to the effective
thermal conductivity has been found to vary little with
average bed temperature. The variation of convective
heat transfer coefficient with effective temperature
difference between the wall and the particle at the
vicinity of the wall found to follow a power law
relation.
