Viscous constraints on microorganism approachand interaction
Viscous constraints on microorganism approachand interaction
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DOI：
10.1017/jfm.2018.509
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发表时间：
2018-09-25
影响因子：
3.7
通讯作者：
Fu, Henry Chien
中科院分区：
文献类型：
--
作者：
Jabbarzadeh, Mehdi;Fu, Henry Chien
在包括觅食和交配在内的一系列生命过程中，微生物必须接近其他悬浮生物或颗粒，以便与它们相互作用。微生物生活在低雷诺数，粘度占主导地位，并强烈影响游泳者和附近的细胞和物体的流体动力学。粘性流体力学使得两个表面在低雷诺数条件下难以接近。尽管如此，观察到流体中的微生物仍然能够接近足够近的相互作用或悬浮颗粒。在这里，我们研究了粘性流体力学提供的物理约束如何影响鞭毛和纤毛微生物直接接近不同大小目标的可行性。我们发现单鞭毛游泳者接近相同大小或更大的目标是可行的。另一方面，对于蠕动者来说，这种方法的可行性取决于近场流，这种近场流可以通过游泳动作的细节来控制。
Microorganisms must approach other suspended organisms or particles in order to interact with them during a host of life processes including feeding and mating. Microorganisms live at low Reynolds number where viscosity dominates and strongly affects the hydrodynamics of swimmer and nearby cells and objects. Viscous hydrodynamics makes it difficult for two surfaces to approach closely at low Reynolds numbers. Nonetheless, it is observed that microorganisms in fluid are still able to approach closely enough to interact with each other or suspended particles. Here, we study how the physical constraints provided by viscous hydrodynamics affects the feasibility of direct approach of flagellated and ciliated microorganisms to targets of different sizes. We find that it is feasible for singly flagellated swimmers to approach targets that are the same size or bigger. On the other hand, for squirmers, the feasibility of approach depends on near-field flows that can be controlled by the details of their swimming strokes.