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Structure factors in granular experiments with homogeneous fluidization (Articolo in rivista)
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- Structure factors in granular experiments with homogeneous fluidization (Articolo in rivista) (literal)
- Anno
- 2012-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.3673876 (literal)
- Alternative label
Andrea Puglisi (1); Andrea Gnoli (1,2); Giacomo Gradenigo (1); Alessandro Sarracino (1); Dario Villamaina (1,3) (2012)
Structure factors in granular experiments with homogeneous fluidization
in The Journal of chemical physics
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Andrea Puglisi (1); Andrea Gnoli (1,2); Giacomo Gradenigo (1); Alessandro Sarracino (1); Dario Villamaina (1,3) (literal)
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- http://jcp.aip.org/resource/1/jcpsa6/v136/i1/p014704_s1 (literal)
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- 1) Istituto dei Sistemi Complessi - CNR and Dipartimento di Fisica, Università \"Sapienza,\" p.le A. Moro 2,
00185 Rome, Italy
2) Istituto dei Sistemi Complessi - CNR, via del Fosso del Cavaliere 100, 00133 Rome, Italy
3) Université Paris Sud - CNRS - LPTMS, UMR 8626, Orsay 91405, France (literal)
- Titolo
- Structure factors in granular experiments with homogeneous fluidization (literal)
- Abstract
- Velocity and density structure factors are measured over a hydrodynamic range of scales in a horizontal quasi-2D fluidized granular experiment, with packing fractions \phi\in[10%,40%]. The fluidization is realized by vertically vibrating a rough plate, on top of which particles perform a Brownian-like horizontal motion in addition to inelastic collisions. On one hand, the density structure factor is equal to that of elastic hard spheres, except in the limit of large length-scales, as it occurs in the presence of an effective interaction. On the other hand, the velocity field shows a more complex structure which is a genuine expression of a non-equilibrium steady state and which can be compared to a recent fluctuating hydrodynamic theory with non-equilibrium noise. The temporal decay of velocity modes autocorrelations is compatible with linear hydrodynamic equations with rates dictated by viscous momentum diffusion, corrected by a typical interaction time with the thermostat. Equal-time velocity structure factors display a peculiar shape with a plateau at large length-scales and another one at small scales, marking two different temperatures: the \"bath\" temperature Tb, depending on shaking parameters, and the \"granular\" temperature Tg < Tb, which is affected by collisions. The two ranges of scales are separated by a correlation length which grows with \phi, after proper rescaling with the mean free path. c (literal)
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