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Using discrete element methods, we study numerically the dynamics of the sizesegregation process of binary particle mixtures in three-dimensional rotatingdrums, operated in the continuous flow regime. Particle rotations are includedand we focus on different volume filling fractions of the drum to study theinterplay between the competing phenomena of mixing and segregation. It isfound that segregation is best for a more than half-filled drum due to thenon-zero width of the fluidized layer. For different particle size ratios, itis found that radial segregation occurs for any arbitrary small particle sizedifference and the final amount of segregation shows a linear dependence on thesize ratio of the two particle species. To quantify the interplay betweensegregation and mixing, we investigate the dynamics of the center of masspositions for each particle component. Starting with initially separatedparticle groups we find that no mixing of the component is necessary in orderto obtain a radially segregated core.Comment: 9 pages, 12 figures (EPIC/EEPIC & EPS, macros included), submitted to  Physics of Fluid

Competition of mixing and segregation in rotating cylinders