Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/18820
 Title: Randomly driven granular fluids: collisional statistics and short scale structure Author: Pagonabarraga Mora, IgnacioTrizac, EmmanuelVan Noije, T. P. C.Ernst, M. H. Keywords: Materials granularsTeoria cinètica dels gasosTermodinàmica del desequilibriGranular materialsKinetic theory of gasesNonequilibrium 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: http://dx.doi.org/10.1103/PhysRevE.65.011303 It is part of: Physical Review E, 2001, vol. 65, núm. 1, p. 011303-1-011303-19 Related resource: http://doi.org/10.1103/PhysRevE.65.011303 URI: http://hdl.handle.net/2445/18820 ISSN: 1063-651X Appears in Collections: Articles publicats en revistes (Física de la Matèria Condensada)

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