Optimal Hydrodynamic Synchronization of Colloidal Rotors
Optimal Hydrodynamic Synchronization of Colloidal Rotors
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DOI：
10.1103/physrevlett.111.228103
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发表时间：
2013-11-27
影响因子：
8.6
通讯作者：
Cicuta, Pietro
中科院分区：
文献类型：
--
作者：
Kotar, Jurij;Debono, Luke;Cicuta, Pietro
驱动振荡器的同步是人工和生物细丝（如纤毛）中产生流动的一个关键方面。先前的理论和数值研究已经考虑了纤毛的“转子”模型，其中细丝粗粒成一个胶体球，在给定的力定律的驱动下沿着预定的轨迹来表示纤毛的振荡运动。这些研究指出了同步出现的两个重要因素：轨道周围驱动力的调制和轨迹的可变形性。在这项工作中，通过数值模拟和理论支持的实验表明，这两个因素都很重要，即使在存在热噪声的情况下，也可以结合起来产生强同步（在几个周期内）。
Synchronization of driven oscillators is a key aspect of flow generation in artificial and biological filaments such as cilia. Previous theoretical and numerical studies have considered the "rotor'' model of a cilium in which the filament is coarse grained into a colloidal sphere driven with a given force law along a predefined trajectory to represent the oscillating motion of the cilium. These studies pointed to the importance of two factors in the emergence of synchronization: the modulation of the driving force around the orbit and the deformability of the trajectory. In this work it is shown via experiments, supported by numerical simulations and theory, that both of these factors are important and can be combined to produce strong synchronization (within a few cycles) even in the presence of thermal noise.