The Permeation of Particles of Different Properties in a Moving Bed

In order to clarify the effects of particle size and density on the segregation of the particles, some experiments on the permeation of the particles having different size and density from those of the bed were carried out in a moving bed by using glass beads and spherical particles of alumina with various sizes and densities.The results indicate that a simple flowing pattern of the particles exists in the moving bed and the degree of permeation can be represented by the following empirical equation, x_T/x_B = 0.8(ρ_T/ρ_B) + 1.2 (D_B/D_T)^n -1 where n = 1 at D_T ≤ D_B or n = 2 at D_T > D_B, and X_T/X_B is the quantity defined as an index of the permeation degree of the particles in a moving bed, which is independent of the moving distance of the bed. It is suggested that this index of segregation can be used to predict the amount of segregation occurring when mixtures of particles of different properties are handled in equipment where the flow pattern is more complicated