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We consider through simulations the behavior of elongated grains on avibrating ratchet-shaped base. We observe differences in layer velocity profileand in net grain velocity for grains that are composed of one, two, or threecolinear spheres. In the case of mixtures of different species of grains, wedemonstrate layer-by-layer variation in the average velocity as well as layersegregation of species, and show that horizontal separation of the species canbe achieved using this geometry. We also find that the addition of a smallnumber of shorter grains to a sample of long grains provides a lubricationeffect that increases the velocity of the long grains.Comment: 8 pages, 7 postscript figure

Ratchet-induced segregation and transport of nonspherical grains