Velocity Fluctuations in Helical Propulsion: How Small Can a Propeller Be

被引：52

作者：

Ghosh, Arijit ^{[1
]}

Paria, Debadrita ^{[2
]}

Rangarajan, Govindan ^{[3
]}

Ghosh, Ambarish ^{[1
,2
,4
]}

机构：

[1] Indian Inst Sci, Dept Elect Commun Engn, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Ctr Nano Sci & Engn, Bangalore 560012, Karnataka, India

[3] Indian Inst Sci, Dept Math, Bangalore 560012, Karnataka, India

[4] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2014年 / 5卷 / 01期

关键词：

MOLECULES; DIFFUSION; NANOSCALE; MOTION; TORQUE;

D O I：

10.1021/jz402186w

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Helical propulsion is at the heart of locomotion strategies utilized by various natural and artificial swimmers. We used experimental observations and a numerical model to study the various fluctuation mechanisms that determine the performance of an externally driven helical propeller as the size of the helix is reduced. From causality analysis, an overwhelming effect of orientational noise at low length scales is observed, which strongly affects the average velocity and direction of motion of a propeller. For length scales smaller than a few micrometers in aqueous media, the operational frequency for the propulsion system would have to increase as the inverse cube of the size, which can be the limiting factor for a helical propeller to achieve locomotion in the desired direction.

引用

页码：62 / 68

页数：7

共 38 条

[1] SEPARATION OF MIRROR ISOMERIC MOLECULES BY RADIO-FREQUENCY ELECTRIC-FIELD OF ROTATING POLARIZATION [J].