Micro-swimming Without Flagella: Propulsion by Internal Structures
Micro-swimming Without Flagella: Propulsion by Internal Structures
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DOI：
10.1134/s1560354711060050
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发表时间：
2011-12-01
影响因子：
1.4
通讯作者：
Koiller, Jair
中科院分区：
文献类型：
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作者：
Ehlers, Kurt M.;Koiller, Jair
自2005年首次出现自主微型游泳设备的概念验证以来，人们对该主题产生了浓厚的兴趣。最常见的配置包括一个由外部螺旋桨驱动的细胞，由细菌（如大肠杆菌）生物启发。杆菌研究由内部机制驱动的微型机器人是否具有竞争力是很自然的。我们计算的平移和旋转速度的球体，产生一个螺旋波在其表面上，已建议为杆状蓝藻聚球藻。这种生物体在没有外部鞭毛的情况下每秒可以游到10个体长。对于数学分析，我们采用切平面近似法，这是足够的振幅，频率和波长考虑在这里。我们还提出了一个定性的讨论由内部旋转结构驱动的设备的效率。
Since a first proof-of-concept for an autonomous micro-swimming device appeared in 2005 a strong interest on the subject ensued. The most common configuration consists of a cell driven by an external propeller, bio-inspired by bacteria such as E. coli. It is natural to investigate whether micro-robots powered by internal mechanisms could be competitive. We compute the translational and rotational velocity of a spheroid that produces a helical wave on its surface, as has been suggested for the rod-shaped cyanobacterium Synechococcus. This organisms swims up to ten body lengths per second without external flagella. For the mathematical analysis we employ the tangent plane approximation method, which is adequate for amplitudes, frequencies and wave lengths considered here. We also present a qualitative discussion about the efficiency of a device driven by an internal rotating structure.