A numerical study of the segregation phenomenon of lognormal particle size distributions in the rotating drum

Abstract

A numerical study of the segregation phenomenon of lognormal particle size distributions in the rotating drum

Effects of size polydispersity on segregation of spherical particles in rotating drum

“…This implies a decreasing proportion number of particles n + in the active region that shows also to be tending to a plateau (see Fig. 7(b)); this was also observed by Yang et al [10]. In the same way, we analyzed the migration of particles through the evolution of the proportion of particles in the passive-active region, we evaluated the evolution of the axial proportion of particles n a in three different zones A, B and C (see Fig.…”

“…The segregation process has been a subject of particular interest in granular materials for mainly separating material. The segregation is observed for materials having higher disparity in their properties such as size polydispersity or density when materials are flowing in a particular regime [1][2][3][4][5][6][7][8][9][10][11][12]. The segregation process is used in food, mining, pharmaceutical, or iron-ore making industry [13][14][15][16]; we also observe this process in nature for phenomena such as debris flow or landslides [17][18][19].…”

“…The particles was generated using a now well known Particle Size Distribution (PSD) [10,27,48,49,51,65] where a uniform distribution in term of particles volume by class was imposed. This approach guarantee a correct representative number of particles for each class and allow to recover the classic grading curve.…”

“…The flow in a rotating drum has several regimes [42][43][44][45][46][47]; we focus here on the rolling regime where the material flow as fluidlike. The polydisperse representative sample is generally generated using Particles Size Distribution PSD [10,27,[48][49][50][51] that consists of generating samples composed by several classes of particles where in each class, belonging particles have the same or nearly the same diameter. At a higher size ratio in diameters, the number of particles in a constant volume increases, and this increase is proportional to the simulation time.…”

DEM Study of the Effect of Impeller Design on Mixing Performance in a Vertical Mixer

“…Despite the power of the DEM, the current simulations reported in the open literature are commonly limited to simple systems with small particle numbers and dimensions, instead of the fully three-dimensional (3D) apparatuses that the industries need. Moreover, the segregation phenomenon induced by differences in density, size, and shape, is a significant factor affecting flow patterns and mixing performance in mixers. , Another critical factor is the geometry configuration of the mixer, especially the impeller design. Several computational efforts have been devoted to explore the effect of impeller design on the mixing performance of various mixers.…”