Heat transfer processes in fluidized beds
Fluidized beds - Mass and heat transfer

Heat transfer in a gas-solid medium depends primarily on the thermophysical properties of the divided solid, but also on those of the interstitial gas.

• These, i.e. the gas's density ρ_g, its mass heat capacity C_Pg, its thermal conductivity λ_g, and its dynamic viscosity µ_g, are all highly temperature-dependent.

  The mass heat capacity, thermal conductivity and dynamic viscosity of gases depend on their composition and are increasing functions of temperature. Conversely, the density of gases decreases with temperature.

  In practice, the fluidizing gas is very often air, or, for example, diluted combustion fumes that can be assimilated to...