Please use this identifier to cite or link to this item:
Title: Randomly driven granular fluids: collisional statistics and short scale structure
Author: Pagonabarraga Mora, Ignacio
Trizac, Emmanuel
Van Noije, T. P. C.
Ernst, M. H.
Keywords: Materials granulars
Teoria cinètica dels gasos
Termodinàmica del desequilibri
Granular materials
Kinetic theory of gases
Nonequilibrium thermodynamics
Issue Date: 2001
Publisher: The American Physical Society
Abstract: We present a molecular dynamics and kinetic theory study of granular material, modeled by inelastic hard disks, fluidized by a random driving force. The focus is on collisional averages and short distance correlations in the non-equilibrium steady state, in order to analyze in a quantitative manner the breakdown of molecular chaos, i.e. factorization of the two-particle distribution function, $f^{(2)}(x_1,x_2) \simeq \chi f^(1)(x_1) f^{(1)}(x_2)$ in a product of single particle ones, where $x_i = \{{\bf r}_i, {\bf v}_i \}$ with $i=1,2$ and $\chi$ represents the position correlation. We have found that molecular chaos is only violated in a small region of the two-particle phase space $\{x_1,x_2\}$, where there is a predominance of grazing collisions. The size of this singular region grows with increasing inelasticity. The existence of particle- and noise-induced recollisions magnifies the departure from mean field behavior. The implications of this breakdown in several physical quantities are explored.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2001, vol. 65, núm. 1, p. 011303-1-011303-19
Related resource:
ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

Files in This Item:
File Description SizeFormat 
507898.pdf715.69 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.