Microfluidic propulsion by the metachronal beating of magnetic artificial cilia: a numerical analysis
Microfluidic propulsion by the metachronal beating of magnetic artificial cilia: a numerical analysis
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DOI：
10.1017/jfm.2011.355
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发表时间：
2011-12-01
影响因子：
3.7
通讯作者：
Onck, P. R.
中科院分区：
文献类型：
--
作者：
Khaderi, S. N.;den Toonder, J. M. J.;Onck, P. R.
在这项工作中，我们使用数值模拟研究了异时波对微通道中磁驱动板状人工纤毛产生的流动的影响。使用耦合磁力固体流体计算模型进行模拟，该模型捕获流体流动、纤毛变形和施加磁场之间的物理相互作用。当旋转磁场应用于超顺磁人工纤毛时，它们会模仿天然纤毛的不对称运动，包括有效和恢复行程。当相邻纤毛之间存在相位差时，就会产生异时波。由于纤毛的离散性质，当相位差变得足够大时，异时波会改变方向，从而导致反波和辛异时性。我们表明，在存在异时波的情况下，人工纤毛产生的流体流动显着增强，并且流体流动变得单向。当纤毛间距较小时，与辛异时性相比，抗皱异时性被观察到导致流动显着增强。在辛异时性的情况下，有效行程方向上的流动阻碍被发现是控制这种效应的关键机制。
In this work we study the effect of metachronal waves on the flow created by magnetically driven plate-like artificial cilia in microchannels using numerical simulations. The simulations are performed using a coupled magneto-mechanical solid fluid computational model that captures the physical interactions between the fluid flow, ciliary deformation and applied magnetic field. When a rotating magnetic field is applied to super-paramagnetic artificial cilia, they mimic the asymmetric motion of natural cilia, consisting of an effective and recovery stroke. When a phase difference is prescribed between neighbouring cilia, metachronal waves develop. Due to the discrete nature of the cilia, the metachronal waves change direction when the phase difference becomes sufficiently large, resulting in antiplectic as well as symplectic metachrony. We show that the fluid flow created by the artificial cilia is significantly enhanced in the presence of metachronal waves and that the fluid flow becomes unidirectional. Antiplectic metachrony is observed to lead to a considerable enhancement in flow compared to symplectic metachrony, when the cilia spacing is small. Obstruction of flow in the direction of the effective stroke for the case of symplectic metachrony was found to be the key mechanism that governs this effect.