Structure and Dynamics of Force Clusters and Networks in Shear Thickening Suspensions
Structure and Dynamics of Force Clusters and Networks in Shear Thickening Suspensions
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DOI：
10.1103/physrevlett.129.068001
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发表时间：
2022-08-02
影响因子：
8.6
通讯作者：
Jamali, Safa
中科院分区：
文献类型：
--
作者：
Nabizadeh, Mohammad;Singh, Abhinendra;Jamali, Safa
致密悬浮液可响应于大变形而表现出剪切增稠。在过去的几年里，人们已经就力网络的形成达成了共识，力网络跨越整个系统的大小，导致运动阻力增加。然而，这些网络的特点在很大程度上知之甚少。在这里，力网络形成连续和不连续的剪切增稠稠密悬浮液（CST和DST，分别）进行了研究。我们首先展示了网络形成的演变及其拓扑异质性，作为所施加的应力增加。随后，我们确定力社区和粗粒悬浮成一个集群网络，并表明集群级动力学是负责CST和DST行为之间的明显差异。我们的研究结果表明，在DST制度中形成的力集群是相当多的限制，在他们的运动，而CST集群松散地连接到他们周围的集群。
Dense suspensions can exhibit shear thickening in response to large deformation. A consensus has emerged over the past few years on the formation of force networks, that span the entire system size, that lead to increased resistance to motion. Nonetheless, the characteristics of these networks are to a large extent poorly understood. Here, force networks formed in continuous and discontinuous shear thickening dense suspensions (CST and DST, respectively) are studied. We first show the evolution of the network formation and its topological heterogeneities as the applied stress increases. Subsequently, we identify force communities and coarse grain the suspension into a cluster network, and show that cluster-level dynamics are responsible for stark differences between the CST and DST behavior. Our results suggest that the force clusters formed in the DST regime are considerably more constrained in their motion, while CST clusters are loosely connected to their surrounding clusters.