论文标题
球形旋转器的惯性聚类和新兴相位分离
Inertial clustering and emergent phase separation of spherical spinners
论文作者
论文摘要
我们研究了惯性状态下牛顿流体中悬浮的球形旋转器的流体动力学。我们在低但有限的粒子雷诺数和体积分数下观察到旋转器自发凝结到富含粒子的区域。粒子簇具有连贯的内部动力学。旋转器形成胶体涡旋，周围是颗粒耗尽的流体。在周期性的模拟框中和旋转器局限于两个扁平壁之间时都观察到涡流的形成。观察到的状态的稳定仅依赖于旋转器之间的流体动力相互作用，并且需要有限的惯性。观察结果为实现3维旋转材料的道路铺平了道路，其中相干结构和集体动力学仅来自成分的旋转运动。
We study the hydrodynamics of spherical spinners suspended in a Newtonian fluid at inertial regime. We observe a spontaneous condensation of the spinners into particle rich regions, at low but finite particle Reynolds numbers and volume fractions. The particle clusters have a coherent internal dynamics. The spinners form colloidal vortices surrounded by the fluid depleted of the particles. The formation of vortices is observed both in periodic simulation box and when the spinners are confined between two flat walls. The stabilisation of the observed states relies only on hydrodynamic interactions between the spinners and requires a finite amount of inertia. The observations pave the way for the realisation of 3-dimensional spinner materials, where coherent structures and collective dynamics arise only from the rotational motion of the constituents.
