Effect of metachronal waves
نویسنده
چکیده
In this chapter we study the effect of metachronal waves on the flow created by magnetically-driven artificial cilia in microchannels. We use a coupled magnetomechanical solid-fluid 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. Two ways of generating a metachronal motion of cilia are considered; by prescribing an external phase difference and by applying a non-uniform magnetic field. 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.
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