剪切流中主动转子的出现条纹
Emergent Stripes of Active Rotors in Shear Flows
摘要：
通过数值模拟研究了主动转子剪切诱导自组织成条状聚集体的过程。的转子，建模单层的摩擦球，只有当他们相对于施加的剪切流的涡反向旋转时，发展成条纹状的微观结构。条纹的平均宽度被证明是线性依赖于相对强度的主动扭矩的剪切速率。通过洞察三种集体粒子行为，即，剪切诱导的扩散，旋转诱导的重排，和边缘流，我们解释的颗粒条纹的形成机制。此外，流变学的结果显示的依赖性的剪切和旋转粘度上的主动扭矩方向和奇异的法向应力响应。通过展示一种主动转子的集体现象，我们的研究为理解手性活性物质铺平了道路。
英文摘要：
The shear-induced self-organization of active rotors into stripy aggregates is studied by carrying out computational simulations. The rotors, modeled by monolayers of frictional spheres, develop to stripy microstructures only when they counterrotate with respect to the vorticity of the imposed shear flow. The average width of the stripes is demonstrated to be linearly dependent on the relative intensity of active torque to the shear rate. By giving insight into three collective particle behaviors, i.e., shear-induced diffusion, rotation-induced rearrangement, and edge flows, we explain the mechanisms of formation of the particle stripes. Additionally, the rheological result shows the dependence of shear and rotational viscosities on the active torque direction and the oddness of the normal stress response. By exhibiting a collective phenomenon of active rotors, our study paves the way to understanding chiral active matter.
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