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Size and Density Separation in Granular Materials

Published online by Cambridge University Press:  11 February 2011

Matthias MöBius,
Sidney R. Nagel and
Heinrich M. Jaeger
Matthias MöBius
Affiliation:
James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637
Sidney R. Nagel
Affiliation:
James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637
Heinrich M. Jaeger
Affiliation:
James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637
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Abstract

We review mechanisms leading to the separation of granular mixtures according to the size or density of the constituent particles. Besides a general overview, the focus of this article is on separation induced by vertical vibrations of the vessel holding the granular material, and specifically on recent results showing a density-dependence to the separation process. A convenient measure of the separation speed is the rise time of a larger “intruder particle” from some fixed initial depth to the free surface, where it will remain. Recent experiments have shown that for large intruder sizes the rise time depends on the density of the intruder particle. Furthermore, in three-dimensional systems we found that this density dependence is highly nonmonotonic. While there is no detailed theoretical understanding available yet, our experiments demonstrate that this surprising behavior is produced by interactions not only between the large intruder particle and the smaller particles of the surrounding granular bed, but also between the particles and the interstitial air.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 759: Symposium MM – Granular Material-Based Technologies , 2002, MM3.6
Copyright
Copyright © Materials Research Society 2003

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