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首页> 外文期刊>The European physical journal, E. Soft matter >Fluid transport at low Reynolds number with agnetically actuated artificial cilia
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Fluid transport at low Reynolds number with agnetically actuated artificial cilia

机译：具有人工致动纤毛的低雷诺数流体传输

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摘要

By numerical modeling we investigate fluid transport in low-Reynolds-number flow achieved with a special elastic filament or artifical cilium attached to a planar surface. The filament is made of superparamagnetic particles linked together by DNA double strands. An external magnetic field induces dipolar interactions between the beads of the filament which provides a convenient way of actuating the cilium in a well-controlled manner. The filament has recently been used to successfully construct the first artificial micro-swimmer (R. Dreyfus et al., Nature 437, 862 (2005)). In our numerical study we introduce a measure, which we call pumping performance, to quantify the fluid transport induced by the magnetically actuated cilium and identify an optimum stroke pattern of the filament. It consists of a slow transport stroke and a fast recovery stroke. Our detailed parameter study also reveals that for sufficiently large magnetic fields the artificial cilium is mainly governed by the Mason number that compares frictional to magnetic forces. Initial studies on multi-cilia systems show that the pumping performance is very sensitive to the imposed phase lag between neighboring cilia, i.e., to the details of the initiated metachronal wave.
机译：通过数值模型，我们研究了通过附着在平面上的特殊弹性细丝或人造纤毛在低雷诺数流中的流体传输。细丝由通过DNA双链连接在一起的超顺磁性颗粒制成。外部磁场在细丝的小珠之间感应出偶极相互作用，从而提供了以良好控制的方式激活纤毛的便捷方法。细丝最近已被用于成功地构建第一台人造微游泳机（R. Dreyfus等人，Nature 437，862（2005））。在我们的数值研究中，我们引入了一种称为抽运性能的测量方法，以量化由磁驱动纤毛诱导的流体传输并确定灯丝的最佳行程模式。它由慢速运输冲程和快速恢复冲程组成。我们详细的参数研究还表明，对于足够大的磁场，人造纤毛主要由将摩擦力与磁力进行比较的梅森数决定。对多纤毛系统的初步研究表明，泵浦性能对相邻纤毛之间施加的相位滞后非常敏感，即对所引发的次同步波的细节非常敏感。

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