Similarity criteria for processes of gravitational classification

Similarity criteria for processes such as gravitational separation of bulk materials are understood as relationships that make it possible to obtain universal curves of separation. For turbulent separation regimes, such criteria were determined earlier [E. Barsky and M. Barsky, Master Curve of Separation Processes. Phys. Sep. Sci. Engin., 13 (2004), 1-13; M.D. Barsky, Powder Fractionation, Moscow, Nedra, 1980 (in Russian)]. In the present article, on the basis of cascade and structural model, similarity criteria are developed, which make it possible to obtain universal curves of separation in all regimes of the motion of the medium. Their applicability is demonstrated on concrete experimental data.