Multifractional Separation of Polydisperse Particles Varying in Shape and Density

Kudi, A. N.; Fedosov, N. A.; Sergeev, Vitaly; Tarakanov, A. G.; Pronin, V. A.; Goncharova, A. E.

doi:10.17277/vestnik.2021.02.pp.285-293

Cited by 1 publication

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“…The effects of segregation and quasi-diffusion separation have principally different physical nature and are caused by the action of principally different driving forces [7,14,16]. The segregation mechanism consists in relaxation of excess stresses generated by nonuniform particles in shear flow [11,21,22]. The excess stresses are calculated with respect to the stresses generated by particles of a conventionally uniform granular medium under identical flow conditions [23].…”

Section: Introductionmentioning

confidence: 99%

Mechanism and kinetics of separation of impurity particles with different densities in a rapid gravity flow of granular material

Ivanov,

Dolgunin,

Tarakanov

et al. 2023

JAMT

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The efficiency of the separation process of impurity particles with different densities in a rapid gravity flow of monodisperse granular material has been studied. The study was carried out by mathematical modeling of particle concentration distribution dynamics on a rough chute using a mathematical model that takes into account the kinetics of convection, mixing, segregation and quasi-diffusion separation effects. During the research process, the relative density of impurity particles in the range of 0.2-4.0 was varied with respect to the base component particle density, and this confirms the defining role of the quasi-diffusive separation effect. It was found that the concentration distribution profiles of lowand high-density particles have a shape similar to the shape of the profiles of the volume fractions of voids and solids, respectively. With the same degree of difference between the light and heavy impurity particles from the base component particles, the light particles have a higher tendency to separate. The tendency to separation with increasing degree of difference between the density of the impurity particles and the density of the base component particles increases more intensively for the impurity particles with low density. It is found that with decreasing concentration of impurity particles in the flow, the intensity of their separation increases for particles with low density and decreases for particles with high density. A binary mixture of homogeneous particles with the minimum volume content of low density particles is characterized by the highest tendency to particle density separation.

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