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Direct Observation of Size Segregation: Convection and Arching Effect

Published online by Cambridge University Press:  03 September 2012

J. Duran ,
T. Mazozi ,
E. Clement  and
J. Rajchenbach
J. Duran
Affiliation:
Laboratoire d' Acoustique et d'Optique de la Matière Condensée, Université Pierre et Marie Curie, 4 place Jussieu, 75252 PARIS, FRANCE.
T. Mazozi
Affiliation:
Laboratoire d' Acoustique et d'Optique de la Matière Condensée, Université Pierre et Marie Curie, 4 place Jussieu, 75252 PARIS, FRANCE.
E. Clement
Affiliation:
Laboratoire d' Acoustique et d'Optique de la Matière Condensée, Université Pierre et Marie Curie, 4 place Jussieu, 75252 PARIS, FRANCE.
J. Rajchenbach
Affiliation:
Laboratoire d' Acoustique et d'Optique de la Matière Condensée, Université Pierre et Marie Curie, 4 place Jussieu, 75252 PARIS, FRANCE.
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Abstract

We report an experimental study of the ascent of a large disc imbedded in a 2D packing ofsmall beads vertically vibrated. Two distinct mechanisms leading to size segregation are observed in situ. At high acceleration, the convection process associated with surface trapping is predominates. At low acceleration, we examine the effect of the size ratio on the dynamics of the segregation which is either intermittent or continuous. This isdue to the successive formation and destruction of arches.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 367: Symposium P – Fractal Aspects of Materials , 1994 , 491
Copyright
Copyright © Materials Research Society 1995

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References

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