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Segregation in granular matter under horizontal swirling excitation S. Auma tre, C. A. Kruelle, and I. Rehberg
 

Summary: Segregation in granular matter under horizontal swirling excitation
S. Auma “ tre, C. A. Kruelle, and I. Rehberg
Experimentalphysik V, Universita ˜ t Bayreuth, D­95440 Bayreuth, Germany
#Received 19 December 2000; published 26 September 2001#
A segregation phenomenon in a horizontally vibrated monolayer of granular matter is studied experimen­
tally. In a binary mixture of small spheres and larger disks, the collapse speed of the disks increases dramati­
cally with increasing granular temperature. The scaling behavior can be understood by applying arguments
from kinetic gas theory.
DOI: 10.1103/PhysRevE.64.041305 PACS number#s#: 45.70.Mg, 05.20.#y, 64.75.#g
Solid particles of different sizes tend to demix when
moved. This effect occurs in Nature in rock avalanches #1#,
for example, and is of tremendous importance in industrial
powder processing #2#. Recently, a particular impressive
phenomenon of size segregation became known under the
name Brazil nut effect #3,4#.
Experimental investigations of related phenomena include
an inclined plane where the binary mixture flows under grav­
ity. Larger particles accumulate at the front of the avalanche,
which then shows a remarkable fingering instability #5#. A
half­filled rotating drum is often used to study this phenom­

  

Source: Aumaître, Sébastien - Laboratoire de Physique Statistique, Département de Physique, École Normale Supérieure

 

Collections: Physics