摇动和搅拌：随机组织可降低颗粒悬浮液的粘度和耗散
Shaken and stirred: Random organization reduces viscosity and dissipation in granular suspensions
摘要：
大（$\geq10{μm}$）颗粒的悬浮液的粘度在高固体分数下由于摩擦颗粒接触的扩散而发散。减少摩擦，以允许或改善流动性，通常通过调整组合物，改变颗粒尺寸和形状或通过添加润滑分子来实现。我们提出了数值模拟，证明了一种互补的方法，即粘度发散转移驱动流调谐，在各种配置中使用叠加剪切振荡，以促进主流。振荡驱动悬浮液朝向不平衡的吸收状态相变，其中主导粘度的摩擦颗粒接触以自组织方式减少。该方法可以允许其他堵塞状态流动;即使对于未堵塞状态，它也可以显著降低每单位应变耗散的能量。这创造了一种可行的途径，以在成分调整不可取或有问题的广泛悬浮液中增强流动。
英文摘要：
The viscosity of suspensions of large ($\geq10{μm}$) particles diverges at high solid fractions due to proliferation of frictional particle contacts. Reducing friction, to allow or improve flowability, is usually achieved by tuning the composition, either changing particle sizes and shapes or by adding lubricating molecules. We present numerical simulations that demonstrate a complementary approach whereby the viscosity divergence is shifted by driven flow tuning, using superimposed shear oscillations in various configurations to facilitate a primary flow. The oscillations drive the suspension towards an out-of-equilibrium, absorbing state phase transition, where frictional particle contacts that dominate the viscosity are reduced in a self-organizing manner. The method can allow otherwise jammed states to flow; even for unjammed states, it can substantially decrease the energy dissipated per unit strain. This creates a practicable route to flow enhancement across a broad range of suspensions where compositional tuning is undesirable or problematic.
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