Flow rule, self-channelization, and levees in unconfined granular flows
Flow rule, self-channelization, and levees in unconfined granular flows
复制标题
DOI：
10.1103/physrevlett.97.158303
复制
发表时间：
2006-10-13
影响因子：
8.6
通讯作者：
Andreotti, B.
中科院分区：
文献类型：
--
作者：
Deboeuf, S.;Lajeunesse, E.;Andreotti, B.
对无约束颗粒沿着斜面流动进行了实验研究。在一个长的瞬态，流量得到限制准静态银行，但仍然横向传播到一个定义明确的渐近状态以下的非平凡的过程。足够远的银行的深度平均速度的缩放得到，这扩展了均匀稳定流得到的。接近堵塞时，它表现出一种向非局部流变学的交叉。我们发现，堤坝，通常观察到沿着两侧的存款中断后的流量，消失了很长的流量持续时间。我们证明了存款的形态建立在流动过程中，在一个基本的静态层，这可以推导出从表面速度剖面的形式，通过施加相同的流动规则无处不在的流动。
Unconfined granular flows along an inclined plane are investigated experimentally. During a long transient, the flow gets confined by quasistatic banks but still spreads laterally towards a well-defined asymptotic state following a nontrivial process. Far enough from the banks a scaling for the depth averaged velocity is obtained, which extends the one obtained for homogeneous steady flows. Close to jamming it exhibits a crossover towards a nonlocal rheology. We show that the levees, commonly observed along the sides of the deposit upon interruption of the flow, disappear for long flow durations. We demonstrate that the morphology of the deposit builds up during the flow, in the form of an underlying static layer, which can be deduced from surface velocity profiles, by imposing the same flow rule everywhere in the flow.