Our model [5] was applied for the pneumatic transport in the case of fluidized bed: T = 850 [degrees]C, low density of carrier gas [rho] = 0.27 kg/[m.sup.3], high

coefficient of kinematic viscosity which is roughly 10 times larger than that in the normal conditions and the real inlet size of 2.5 m.

The Prandtl number for the nondimension parameter mentioned in the discussion of the heat transfer behavior is obtained as the ratio of the coefficient of kinematic viscosity based on the diffusion of the momentum of the fluid to the thermal diffusivity based on the thermal conductivity, as follows:

2, the coefficient of kinematic viscosity v is equal to [eta]/[rho], and the thermal diffusivity [alpha] is equal to [lambda]/[C.sub.p][rho], where [rho] is the density of the polymer.