Particle diffusion in slow granular bulk flows
Particle diffusion in slow granular bulk flows
复制标题
缓慢颗粒整体流中的颗粒扩散
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Hecke
中科院分区：
文献类型：
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作者：
E. Wandersman;J. Dijksman;M. Hecke
本文研究了在缓慢剪切的三维颗粒悬浮液中颗粒的扩散运动。对于足够大的应变，粒子动力学表现出扩散高斯统计，扩散率与局部应变率成比例-与局部准静态图像一致。令人惊讶的是，扩散率也与颗粒表面以下的颗粒深度成反比-在其自由表面处，扩散率因此似乎发散并且不明确。我们发现，交叉高斯位移统计是由相同的深度依赖性，证明了一个非平凡的应变尺度在三维颗粒流。
We probe the diffusive motion of particles in slowly sheared three-dimensional granular suspensions. For sufficiently large strains, the particle dynamics exhibits diffusive Gaussian statistics, with the diffusivity proportional to the local strain rate —consistent with a local, quasi-static picture. Surprisingly, the diffusivity is also inversely proportional to the depth of the particles below the granular surface —at their free surface, the diffusivity thus appears to diverge and is ill defined. We find that the crossover to Gaussian displacement statistics is governed by the same depth dependence, evidencing a non-trivial strain scale in three-dimensional granular flows.
影响因子：
8.6
作者：
Besseling, R.;Weeks, Eric R.;Poon, W. C. K.
通讯作者：
Poon, W. C. K.