Propulsive force measurements and flow behavior of undulatory swimmers at low Reynolds number
Propulsive force measurements and flow behavior of undulatory swimmers at low Reynolds number
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DOI：
10.1063/1.3529236
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发表时间：
2010-12-01
影响因子：
4.6
通讯作者：
Arratia, P. E.
中科院分区：
文献类型：
--
作者：
Sznitman, J.;Shen, X.;Arratia, P. E.
本文研究了秀丽隐杆线虫在粘度递增的水溶液中的游动行为。详细的流动动力学与线虫的游泳运动，以及推进力和功率获得使用粒子跟踪和测速方法。我们发现C.秀丽线虫能提供几纳秒量级的推进力这些发现得到了使用阻力理论获得的值的支持;法向与切向阻力系数的比值估计约为1.4。在这里研究的解决方案的范围内，流动性能仍然在很大程度上独立于粘度。流远离线虫体的速度幅值迅速衰减小于一个身体的长度和崩溃到一个单一的主曲线。总的来说，我们的研究结果支持C。elegans是研究小尺度推进与低雷诺数流体动力学耦合的一个有吸引力的活体模型。(C)2010年美国物理学会。[doi：10.1063/1.3529236]
The swimming behavior of the nematode Caenorhabditis elegans is investigated in aqueous solutions of increasing viscosity. Detailed flow dynamics associated with the nematode's swimming motion as well as propulsive force and power are obtained using particle tracking and velocimetry methods. We find that C. elegans delivers propulsive thrusts on the order of a few nanonewtons. Such findings are supported by values obtained using resistive force theory; the ratio of normal to tangential drag coefficients is estimated to be approximately 1.4. Over the range of solutions investigated here, the flow properties remain largely independent of viscosity. Velocity magnitudes of the flow away from the nematode body decay rapidly within less than a body length and collapse onto a single master curve. Overall, our findings support that C. elegans is an attractive living model to study the coupling between small-scale propulsion and low Reynolds number hydrodynamics. (C) 2010 American Institute of Physics. [doi:10.1063/1.3529236]