HEAT TRANSFER BY SIMULTANEOUS RADIATION-CONDUCTION AND CONVECTION IN A HIGH TEMPERATURE PACKED BED

A numerical model of a packed bed reactor for gasifying coal in mixed control using concentrated solar radiation is proposed. Case’s normal-mode expansion technique is used to obtain solutions to the radiative transfer problem for the packed bed. The comparison between the radiative heat transfer and the exchanges by conduction and forced convection is analysed. The model permits the determination of temperature profiles for both the gas and the solid phases and the evolutions of thermal flux densities in the reactor