Gas supply during fluidization of spherical particles in FBR

Calculations of gas flow requirements and of other related parameters in the fluidized-bed process used to coat nuclear fuel particles are presented. These data include: volumes and surfaces of spheres for diameters of 50 to 500μm: number of theses spheres in 1 g for densities of 2 to 11 g/cm3: overall densities of coated spheres for initial particle diameters of 50 to 500μm, initial densities of 8 to 11 g/cm3, coating densities of 1.0 to 2.2 g/cm3, and final particle diameters of 100 to 1000μm: viscosities of Ar, CO2, He, and H2 for temperatures up to 2200 .deg. C: minimum flows of He and Ar necessary to fluidized nuclear fuel particles at 20 .deg. C: coefficients for converting the 20 .deg. C minimum fluidization gas flows to high-temperature flows (up to 2200 .deg. C): variation of particle diameter with time for constant weight deposition rate: variation of coating gas flow for constant linear growth of the coating: comparison of coating time at constant weight deposition rate and at constant coating growth rate