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SUMMARY:Joint ICTP/SISSA Statistical Physics Seminar: Granular Brownian Mo
tion
DTSTART;VALUE=DATE-TIME:20190312T100000Z
DTEND;VALUE=DATE-TIME:20190312T110000Z
DTSTAMP;VALUE=DATE-TIME:20190421T090733Z
UID:indico-event-8817@ictp.it
DESCRIPTION:\n Granular materials are made of macroscopic particles\, call
ed grains: sand\, rice\, sugar and powders are typical examples. They are
important in our everyday life\, in many industrial applications and in th
e prevention of geophysical hazards.\n In physics\, mainly in the realm of
non-equilibrium statistical mechanics\, granular systems are an inspiring
source of phenomena and questions. The simplest model of granular materia
l is a "fluid" made of inelastic hard spheres. For such a system - in the
dilute limit - the classical program of kinetic theory Boltzmann equation\
, Chapman-Enskog-based hydrodynamics\, and much more) has been developed b
y physicists and mathematicians in the last decades.\n In this seminar\, a
fter recalling a few key results of such a theoretical activity\, I will f
ocus on a series of experiments made in my laboratory in the last 5 years.
They concern the statistical properties of a massive probe immersed in a
steady state granular fluid. The fluid is obtained by vibro-fluidization o
f a large number of solid spheres of different materials\, while the probe
is a rigid rotator whose angular displacement and angular velocity are th
e key observables. In the dilute limit one conjectures a Markovian approxi
mation for the rotator's dynamics which explains many aspects of the exper
iment\, including a qualitative understanding of "motor effects" in the pr
esence of rotator's geometrical asymmetries. Further noticeable facts appe
ar when the granular fluid is no more dilute\, mainly anomalous diffusion
and non-monotonous viscosity.\n References:\n A. Gnoli\, L. de Arcangelis\
, F. Giacco\, E. Lippiello\, M. Pica Ciamarra\, A. Puglisi\, A. Sarracino
Controlled viscosity in dense granular materials Phys. Rev. Lett. 120\, 13
8001 (2018)\n C. Scalliet\, A. Gnoli\, A. Puglisi\, A. Vulpiani Cages and
anomalous diffusion in vibrated dense granular media Phys. Rev. Lett. 114\
, 198001 (2015)\n A. Gnoli\, A. Petri\, F. Dalton\, G. Gradenigo\, G. Pont
uale\, A. Sarracino\, A. Puglisi Brownian Ratchet in a Thermal Bath Driven
by Coulomb Friction Phys. Rev. Lett. 110\, 120601 (2013)\n\nhttp://indico
.ictp.it/event/8817/
LOCATION:SISSA\, Via Bonomea 265\, room 128
URL:http://indico.ictp.it/event/8817/
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