Band-in-band segregation of multidisperse granular mixtures


Newey, M. and Ozik, J. and Meer, S.M. van der (2004) Band-in-band segregation of multidisperse granular mixtures. Europhysics Letters, 66 (2). pp. 205-211. ISSN 0295-5075

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Abstract: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.
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Copyright:© 2004 IOP Science
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