Effect of friction on dense suspension flows of hard particles.
Effect of friction on dense suspension flows of hard particles.
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DOI：
10.1103/physreve.95.012605
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
M. Trulsson;E. DeGiuli;M. Wyart
中科院分区：
文献类型：
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作者：
M. Trulsson;E. DeGiuli;M. Wyart
我们使用数值模拟来研究颗粒摩擦对非布朗硬颗粒悬浮液流动的影响。通过系统地改变微观摩擦系数 μ_{p} 和粘性数 J，我们构建了一个相图来识别三种流动状态：无摩擦、摩擦滑动和滚动。利用流动中的能量平衡，我们预测动力学可观测值之间的关系，并通过数值模拟得到证实。对于现实的摩擦系数和小粘性数（低于 J∼10^{-3}），我们表明主要的耗散机制是摩擦接触的滑动，并且我们描述了接近干扰时的渐近行为。在这个范围之外，我们的观察结果支持这样的观点，即流动属于无摩擦粒子的普遍性类别。我们在相图的背景下讨论最近的实验。
We use numerical simulations to study the effect of particle friction on suspension flows of non-Brownian hard particles. By systematically varying the microscopic friction coefficient μ_{p} and the viscous number J, we build a phase diagram that identifies three regimes of flow: frictionless, frictional sliding, and rolling. Using energy balance in flow, we predict relations between kinetic observables, confirmed by numerical simulations. For realistic friction coefficients and small viscous numbers (below J∼10^{-3}), we show that the dominating dissipative mechanism is sliding of frictional contacts, and we characterize asymptotic behaviors as jamming is approached. Outside this regime, our observations support the idea that flow belongs to the universality class of frictionless particles. We discuss recent experiments in the context of our phase diagram.