On the basis of account for special features of hydrodynamics of disperse systems with suspended particles within the framework of the dimensional theory we obtained a system of dimensionless groups (35) which describes similarity of transport processes. System (35) involves new criteria Fr-t(*) = (u - u(t)(*))/gH, (J) over bar (*)(s) = J(s)/rho (s)(u -u(t)(*)) which involve an excess superficial gas velocity u -u(t)(*) and are important generalized characteristics of convective motion of particles. Typical examples of use of system (35) for generalization of experimental data are presented.