Lozano C, Zuriguel I, Garcimartín A, Mullin T
Departamento de Física, Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Spain.
Manchester Center for Nonlinear Dynamics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.
Phys Rev Lett. 2015 May 1;114(17):178002. doi: 10.1103/PhysRevLett.114.178002.
We report the results of an experimental study of particle-particle interactions in a horizontally shaken granular layer that undergoes a second order phase transition from a binary gas to a segregation liquid as the packing fraction C is increased. By focusing on the behavior of individual particles, the effect of C is studied on (1) the process of cluster formation, (2) cluster dynamics, and (3) cluster destruction. The outcomes indicate that the segregation is driven by two mechanisms: attraction between particles with the same properties and random motion with a characteristic length that is inversely proportional to C. All clusters investigated are found to be transient and the probability distribution functions of the separation times display a power law tail, indicating that the splitting probability decreases with time.
我们报告了一项关于水平振动颗粒层中粒子间相互作用的实验研究结果，该颗粒层在堆积分数C增加时经历从二元气体到分离液体的二级相变。通过关注单个粒子的行为，研究了C对以下方面的影响：（1）团簇形成过程；（2）团簇动力学；（3）团簇破坏。结果表明，分离由两种机制驱动：具有相同性质的粒子之间的吸引力以及具有与C成反比的特征长度的随机运动。所有研究的团簇都是瞬态的，分离时间的概率分布函数显示出幂律尾部，表明分裂概率随时间降低。
