Dynamics of a massive intruder in a homogeneously driven granular fluid

被引：5

作者：

Puglisi, A. ^{[1
]}

Sarracino, A. ^{[1
]}

Gradenigo, G. ^{[1
]}

Villamaina, D. ^{[1
,2
]}

机构：

[1] Univ Roma La Sapienza, Dip Fis, CNR ISC, I-00185 Rome, Italy

[2] Univ Paris 11, CNRS, LPTMS, UMR 8626, F-91405 Orsay, France

来源：

GRANULAR MATTER | 2012年 / 14卷 / 02期

关键词：

Granular materials; Non-equilibrium fluctuations; BEHAVIOR;

D O I：

10.1007/s10035-012-0312-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A massive intruder in a homogeneously driven granular fluid, in dilute configurations, performs a memory-less Brownian motion with drag and temperature simply related to the average density and temperature of the fluid. At volume fraction similar to 10-50% the intruder's velocity correlates with the local fluid velocity field: such situation is approximately described by a system of coupled linear Langevin equations equivalent to a generalized Brownian motion with memory. Here one may verify the breakdown of the Fluctuation-Dissipation relation and the presence of a net entropy flux - from the fluid to the intruder-whose fluctuations satisfy the Fluctuation Relation.

引用

页码：235 / 238

页数：4

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