论文标题
惯性旋转器地毯中的两相结晶
Two-phase crystallisation in a carpet of inertial spinners
论文作者
论文摘要
我们研究了扭矩驱动的球形旋转器的动力学，该动力学定居在表面上，并证明有限雷诺数的流体动力相互作用可以导致浓度依赖于浓度和不均匀的结晶。在半稀释浓度下，我们观察到旋转器单层中均匀的六边形结构的快速形成。我们将其归因于由旋转颗粒的二次流产生的排斥流体动力相互作用。增加表面覆盖范围会导致具有两个共存的旋转器密度的状态。均匀的六边形结构偏离了高密度的晶体结构，周围是连续的较低密度的象牙状态。我们表明，由于浓度依赖于旋转频率而引起的非单调流体动力排斥，这种相分离发生。
We study the dynamics of torque driven spherical spinners settled on a surface, and demonstrate that hydrodynamic interactions at finite Reynolds numbers can lead to a concentration dependent and non-uniform crystallisation. At semi-dilute concentrations, we observe a rapid formation of a uniform hexagonal structure in the spinner monolayer. We attribute this to repulsive hydrodynamic interactions created by the secondary flow of the spinning particles. Increasing the surface coverage leads to a state with two co-existing spinner densities. The uniform hexagonal structure deviates into a high density crystalline structure surrounded by a continuous lower density hexatically ordered state. We show that this phase separation occurs due to a non-monotonic hydrodynamic repulsion, arising from a concentration dependent spinning frequency.
