HYDRODYNAMICS OF A CIRCULATING FLUIDIZED BED Yu. S.Teplitskii and V. I. Kovenskii UDC 533.6 Within the framework of similarity theory and using the Frt and Js criteria, which are the generalized characteristics of a circulating fluidized bed, we obtain dimensionless dependences that describe the available experimental data on the wall mass fluxes of particles and the tangential stress on riser walls. The influence of the scale factor and other parameters of the system on the Frt and Js quantities is revealed. A procedure to calculate mass fluxes of particles in the bed core is developed. JEPTER74920199912 JEPTER7492012