Coarsening dynamics in a vibrofluidized compartmentalized granulas gas
Coarsening dynamics in a vibrofluidized compartmentalized granulas gas
复制标题
振动流化分区颗粒气体中的粗化动力学
DOI：
10.1088/1742-5468/2004/04/p04004
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
D. Lohse
中科院分区：
文献类型：
--
作者：
D. Meer;K. Weele;D. Lohse
研究了垂直驱动、初始均匀分布的颗粒状气体在容器内的粗化过程，该容器被分成许多相连的隔间。在实验中观察到，聚类发生在两个阶段的过程中：首先，粒子聚集在几个隔室中。随后，这些星团以不断增加的时间尺度一个接一个地坍塌，直到最后只剩下一个大的星团。我们在分子动力学模拟中发现了同样的一系列事件。为了定量地解释粗化，我们采用了通量模型。它揭示了过程的自相似特征，并允许我们计算竞争集群的平均寿命。发现幸存的簇的大小异常缓慢地增长为[log(t)]1/2。
Coarsening is studied in a vertically driven, initially uniformly distributed granular gas within a container divided into many connected compartments. The clustering is experimentally observed to occur in a two-stage process: first, the particles cluster in a few of the compartments. Subsequently, the clusters collapse one by one, at ever increasing timescales, until eventually only one large cluster remains. We find the same series of events in molecular dynamics simulations. To quantitatively account for the coarsening, we apply a flux model. It reveals the self-similar features of the process and allows us to calculate the mean lifetime of the competing clusters. The size of the surviving clusters is found to grow anomalously slowly as [log(t)]1/2.