Size separation of granular particles

Matthias E. Möbius, Benjamin E. Lauderdale, Sidney R. Nagel () and Heinrich M. Jaeger
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Matthias E. Möbius: University of Chicago
Benjamin E. Lauderdale: University of Chicago
Sidney R. Nagel: University of Chicago
Heinrich M. Jaeger: University of Chicago

Nature, 2001, vol. 414, issue 6861, 270-270

Abstract: Abstract Granular media differ from other materials in their response to stirring or jostling — unlike two-fluid systems, bi-disperse granular mixtures will separate according to particle size when shaken, with large particles rising, a phenomenon termed the 'Brazil-nut effect'1,2,3,4,5,6,7,8. Mounting evidence indicates that differences in particle density affect size separation in mixtures of granular particles9,10,11. We show here that this density dependence does not follow a steady trend but is non-monotonic and sensitive to background air pressure. Our results indicate that particle density and interstitial air must both be considered in size segregation.

Date: 2001
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DOI: 10.1038/35104697

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