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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
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