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Effective temperature and fluctuation-dissipation theorem in athermal granular systems:A review 下载免费PDF全文
The definition and the previous measurements of a dynamics-relevant temperature-like quantity in granular media are reviewed for slow and fast particle systems. Especially, the validity of the fluctuation-dissipation theorem in such an athermal system is explored. Experimental evidences for the fluctuation-dissipation theorem relevant effect temperature support the athermal statistical mechanics, which has been widely explored in recent years by physicists. Difficulties encountered in defining temperature or establishing thermodynamics or statistical mechanics in non-equilibrium situations are discussed. 相似文献
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采用实验、模拟及理论的分析方法, 研究了在圆形混合器、椭圆形混合器、正方形混合器中, 不同转速和填充率条件下, 容器形状对二元颗粒体系分聚与混合的影响. 实验中通过改变转速与填充率, 可获得不同的颗粒分聚与混合图样, 对示踪颗粒运动轨迹的分析发现, 在圆形混合器中, 随着混合器转速的增大, 颗粒在径向的随机性减少;在正方形混合器中, 随着混合器转速的增大, 颗粒在径向的随机性增大.模拟结果发现颗粒流动分为两个区域, 在表面的快速流动和在整体的旋转运动. 通过理论分析发现颗粒分聚在圆形混合器中最明显, 在正方形混合器中最弱, 椭圆形混合器介于二者之间. 相似文献
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In this paper,granular segregation in a two-compartment cell in zero gravity is studied numerically by DEM simulation.In the simulation using a virtual window method we find a non-monotonic flux,a function which governs the segregation.A parameter is used to quantify the segregation.The effect of three parameters:the total number of particles N,the excitation strength F,and the position of the window coupling the two compartments,on the segregation and the waiting time%are investigated.It is found that the segregation observed in zero gravity exists and does not depend on the excitation strength F.The waiting time T,however,depends strongly on F:the higher the F,the lower the waiting time V,The simulation results are important in guiding the SJ-10 satellite microgravity experiments. 相似文献