Locomotion of active matter over a circular cylinder in a microchannel

IF 3.8 2区工程技术 Q1 ENGINEERING, MECHANICAL Acta Mechanica Sinica Pub Date : 2024-09-02 DOI:10.1007/s10409-024-24154-x

Xiao Hu (, ), Longfei Yu (, ), Jianzhong Lin (, ), Deming Nie (, ), Zuchao Zhu (, )

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Abstract

This study numerically investigates the locomotion of active matter over a circular cylinder in a confined microchannel. We consider the effects of cylinder size, swimming Reynolds number on the motion characteristic of three kinds of swimmers. The swimmer’s motion over a cylinder in a microchannel can be classified into seven modes. The cylinder diameter and swimming Reynolds number have no impact on the motion mode of neutral swimmers. When approaching the cylinder, pullers mainly perform periodic motion near the left side of cylinder, the pushers primarily perform periodic motion near the right side of cylinder. The mechanism of the periodic motion is mainly induced by the hydrodynamic interaction between the cylinder, channel walls, and the pressure near the swimmer. As cylinder diameter increases, pushers are more likely to exhibit periodic motion on the surface of cylinder than the pullers. Puller is unable to stabilize on the surface of cylinder at low Reynolds number, it migrates to the right side of cylinder at high Reynolds number, showing a pattern opposite to that observed for pushers. The results provide a possible new path for controlling active matter in microfluidic devices.

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活性物质在微通道圆柱体上的运动

本研究以数值方法研究了活性物质在密闭微通道中的圆柱体上的运动。我们考虑了圆柱体尺寸、游泳雷诺数对三种游泳者运动特性的影响。游泳者在微通道中圆柱体上的运动可分为七种模式。圆筒直径和游泳雷诺数对中性游泳者的运动模式没有影响。接近圆筒时，拉动者主要在靠近圆筒左侧的地方做周期性运动，推动者主要在靠近圆筒右侧的地方做周期性运动。周期性运动的机理主要是由圆筒、通道壁和游泳者附近的压力之间的流体动力学相互作用引起的。随着圆筒直径的增大，推动者比拉动者更容易在圆筒表面表现出周期性运动。在低雷诺数时，牵引器无法稳定在圆柱体表面，而在高雷诺数时，它会迁移到圆柱体的右侧，呈现出与推力器相反的模式。这些结果为控制微流体设备中的活性物质提供了一条可能的新途径。

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来源期刊

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics