Fluid transport at low Reynolds number with magnetically actuated artificial cilia |
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Authors: | E M Gauger M T Downton and H Stark |
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Institution: | 1.Department of Materials,University of Oxford,Oxford,UK;2.Institut für Theoretische Physik,Technische Universit?t Berlin,Berlin,Germany |
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Abstract: | 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. |
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Keywords: | PACS" target="_blank">PACS 87 19 rh Fluid transport and rheology 87 16 A- Theory modeling and simulations 87 16 Qp Pseudopods lamellipods cilia and flagella |
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