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Mechanism of size segregation of particles in filling a hopper was theoretically analyzed on the basis of a screening or percolation model. According to the model, when mixed particles of different size are fed in the center of the hopper and flow down on solids heap surface, smaller particles within the mixture pass through interspaces of larger particles during flow and then are packed in interspaces of stationary large particles of the heap surface. By the analysis and experiments, a V-shaped zone, where smaller particles are contained as a result of segregation, was found to expand with smaller fraction of large particles in the feed, longer distance of flow along the heap surface, and larger feed rate of particles.

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