Ring-like spin segregation of binary mixtures in a high-velocity rotating drum

摘要

We present molecular dynamics simulations on the segregation of binarymixtures in a high-velocity rotating drum. Depending on the ratio of particle'sradius and density, the ring-like spin segregation patterns in radial directionshow similarities to the Brazil-nut effect and its reverse form. The smallerand heavier particles are easier to accumulate towards the drum wall and thebigger and lighter ones towards the drum center. Furthermore, we quantify theeffects of particle's radius and density on the segregation states and plot thephase diagram of segregation in the ${\rho_b}/{\rho_s}$ - ${r_b}/{r_s}$ space.The observed phenomena can also be well explained by the combined actions,i.e., the percolation effect and the buoyancy effect.