Band-in-band segregation of multidisperse granular mixtures

M. Newey, J. Ozik, S.M. van der Meer

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Radial and axial segregation is investigated experimentally in polydisperse mixtures of granular materials rotated in a long, partly filled, horizontal cylinder. Radial segregation by size is observed in all polydisperse mixtures. Axial segregation, with smaller-size particles forming bands within bands of larger-size particles, is observed for mixtures of 3 sizes. In addition, bands in ternary mixtures oscillate axially under some conditions. It is observed that the surface flow speeds depend on the particle size, both in the mixed and segregated case. A simple microscopic model based solely on different frictional properties of three particles yields qualitatively similar results.
Original languageUndefined
Pages (from-to)205-211
JournalEurophysics letters
Issue number2
Publication statusPublished - 2004


  • IR-61311

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