论文标题
摩擦细长谷物的流动和流变学
Flow and rheology of frictional elongated grains
论文作者
论文摘要
通过离散元素模型（DEM）计算研究了由摩擦延长颗粒组成的三维颗粒系统的流变学。模拟了摩擦球状球体的同质剪切流，并计算了许多流变量。在$μ（i）$流变学的框架中，发现有效的摩擦是颗粒间摩擦系数$μ_p\ lyssim 0.4 $的纵横比的非单调功能，而对于较大的$μ_p$来说，这是增加的功能。我们揭示了这种特殊的非单调行为的微观起源。我们显示了速度波动对耗散状态的非平凡依赖性，并追溯了正常应力差异与粒子水平量的行为。
The rheology of a 3-dimensional granular system consisting of frictional elongated particles was investigated by means of discrete element model (DEM) calculations. A homogenous shear flow of frictional spherocyliders was simulated, and a number of rheological quantities were calculated. In the framework of the $μ(I)$ rheology, the effective friction was found to be a non-monotonic function of the aspect ratio for interparticle friction coefficient $μ_p \lesssim 0.4$, while it was an increasing function for larger $μ_p$. We reveal the microscopic origin of this peculiar non-monotonic behavior. We show the non-trivial dependence of the velocity fluctuations on the dissipation regime, and trace back the behavior of the normal stress differences to particle-level quantities.
