Metachronal patterns in artificial cilia for low Reynolds number fluid propulsion.

Metachronal patterns in artificial cilia for low Reynolds number fluid propulsion.
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DOI:
10.1126/sciadv.abd2508
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发表时间:
2020-12
期刊:
影响因子:
13.6
通讯作者:
Gorissen B
Gorissen B
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Milana E;Zhang R;Vetrano MR;Peerlinck S;De Volder M;Onck PR;Reynaerts D;Gorissen B

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The influence of metachronal patterns on ciliary fluid flow has been studied using a soft robotic cilia array and simulations. Cilia are hair-like organelles, present in arrays that collectively beat to generate flow. Given their small size and consequent low Reynolds numbers, asymmetric motions are necessary to create a net flow. Here, we developed an array of six soft robotic cilia, which are individually addressable, to both mimic nature’s symmetry-breaking mechanisms and control asymmetries to study their influence on fluid propulsion. Our experimental tests are corroborated with fluid dynamics simulations, where we find a good agreement between both and show how the kymographs of the flow are related to the phase shift of the metachronal waves. Compared to synchronous beating, we report a 50% increase of net flow speed when cilia move in an antiplectic wave with phase shift of −π/3 and a decrease for symplectic waves. Furthermore, we observe the formation of traveling vortices in the direction of the wave when metachrony is applied.
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