Rheotaxis and migration of an unsteady microswimmer
Rheotaxis and migration of an unsteady microswimmer
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DOI：
10.1017/jfm.2021.921
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发表时间：
2021-11
影响因子：
3.7
通讯作者：
T. Omori;K. Kikuchi;M. Schmitz;M. Pavlović;Cheng-Hsiu Chuang;T. Ishikawa
中科院分区：
文献类型：
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作者：
T. Omori;K. Kikuchi;M. Schmitz;M. Pavlović;Cheng-Hsiu Chuang;T. Ishikawa
摘要由于细胞在生物学、生理学和工程学中的重要作用，细胞在流场中的流变性和迁移性得到了广泛的研究。在这项研究中，首先，我们报告了我们的实验表明，微藻衣藻可以朝向渠道流并迁移到渠道中心。其次，通过边界元模拟，我们证明了观测到的流变和迁移的机制是有物理根源的。最后，利用一个简单的解析模型，我们揭示了河槽水流的流变和迁移的新的物理机制，特别是槽道水流中循环体变形和循环游动速度之间的相互作用。已发现的机制可能与趋光性和重力轴一样重要，并可能在其他自然微型游泳者和具有非互惠身体变形的人造微型机器人的运动中发挥作用。
Abstract Rheotaxis and migration of cells in a flow field have been investigated intensively owing to their importance in biology, physiology and engineering. In this study, first, we report our experiments showing that the microalgae Chlamydomonas can orient against the channel flow and migrate to the channel centre. Second, by performing boundary element simulations, we demonstrate that the mechanism of the observed rheotaxis and migration has a physical origin. Last, using a simple analytical model, we reveal the novel physical mechanisms of rheotaxis and migration, specifically the interplay between cyclic body deformation and cyclic swimming velocity in the channel flow. The discovered mechanism can be as important as phototaxis and gravitaxis, and likely plays a role in the movement of other natural microswimmers and artificial microrobots with non-reciprocal body deformation.