A study on the axial segregation of binary-size particles in a rotary drum
A novel drum composed of multi section cylinders with different friction coefficients was proposed to discuss the axial segregation mechanism of particles in a rotary drum.The particle parameters were ob-tained by the simulation and experiment of stacking test,and the simulation model was verified by the segre-gation experiment in a rotary drum.On this basis,the numerical simulation of the segregation of binary size particles was carried out using discrete element method(DEM).The particle distribution,repose angle,particle speed and gyration radius were adopted to analyze the flow pattern of particles,and the segregation index was used to discuss the segregation performance.The results obtained indicate that the different fric-tion coefficients of drum side wall will lead to different repose angle of particles,which results in the differ-ent particle speeds.Particles in the high friction region move faster than that in the low friction region.The difference of particle velocities results in an obvious axial segregation phenomenon for the binary size parti-cles in the novel rotary drum.Small particles will accumulate in the low friction region while large particles will gather in the high friction region.
rotary drumparticle segregationdiscrete element methodsegregation index