STRUCTURAL INHOMOGENEITY AND EFFECTS OF SEPARATION BY SIZE AND DENSITY IN GRAVITY FLOW OF GRANULAR MATERIALS

The authors have substantiated the expediency of representing the effect of separation of particles as a result of the conjugation of phenomena that are caused by the inhomogeneity of a granular medium and the spatial structural heterogeneity of a shear fl ow. With the general separation-dynamics model taking account of separation, convection, and mixing fl ows, regions of relative values of particle size and density have been determined, in which the dominance of the separation fl ows due to the local and spatial inhomogeneity of the granular-medium's rapid gravity fl ow is noted. It has been established that the boundary of the regions of dominance of separation fl ows with a fundamentally different physical nature which is determined by hydrodynamics and diffusion kinetics is near the equilibrium line of inhomogeneous-particle masses.
   
Author:  V. N. Dolgunin, A. N. Kudi, A. G. Tarakanov
Keywords:  granular material, rapid gravity fl ow, structural inhomogeneity, separation by size and density, segregation, migration, quasi-diffusion
Page:  484