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In a half-filled rotating drum, the size segregation of particles of equaldensity builds a ring pattern of the large particles, whose locationcontinuously varies from the periphery to the center depending on the sizeratio between particles [Thomas, Phys. Rev. E 62, 1 (2000) 961-974]. For smallsize ratios (typically15): large beads are close to the bottom in a reversingposition. The existence of circles with an intermediate radius shows that thesegregation at an intermediate level within a flow is possible. In this paper,we experimentally study the segregation of particles of different densities andsizes in a half-filled rotating drum and other devices (chute flow, pile). Inthe drum, the location of the segregated ring continuously varies from theperiphery to the center and is very sensitive to both the size (from 1 to 33)and density (from 0.36 to 4.8) ratios. The densest large beads segregate on acircle close to the center, the lightest large beads on a circle close to theperiphery. Consequently, we found that for any tracer, its excess of mass, dueto only a size excess, a density excess, or both, leads to a deep insidesegregation of the tracer. There is a push-away process that makes heavy beadsof any type go downwards, while the excess of size is already known to pushlarge beads towards the surface, by a dynamical sieving process. Eachsegregation at an intermediate ring corresponds to a balance between these massand geometrical effects. The segregation level in the flow is determined by theratio of the intensities of both effects.Comment: submitted to Physical Review E (february 2004

Evidence of two effects in the size segregation process in dry granular media