Volume 66, Number 2, April 2004
|Page(s)||205 - 211|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 April 2004|
Band-in-band segregation of multidisperse granular mixtures
Institute for Research in Electronics and Applied Physics, University of Maryland College Park, MD 20742-3511, USA
2 Department of Applied Physics and J.M. Burgers Centre for Fluid Dynamics University of Twente - P.O. Box 217, 7500 AE Enschede, The Netherlands
Accepted: 16 February 2004
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.
PACS: 45.70.Mg – Granular flow: mixing, segregation and stratification / 64.75.+g – Solubility, segregation, and mixing; phase separation / 05.65.+b – Self-organized systems
© EDP Sciences, 2004
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