Propulsion kinematics of achiral microswimmers in viscous fluids
Propulsion kinematics of achiral microswimmers in viscous fluids
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DOI：
10.1063/5.0048277
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发表时间：
2021-05-17
影响因子：
4
通讯作者：
Ali, Jamel
中科院分区：
文献类型：
--
作者：
Benhal, Prateek;Quashie, David, Jr.;Ali, Jamel
本文研究了粘性介质中自组装无手游泳体的动力学行为。研究了两种不同几何形状的磁驱动游泳器在不同均匀旋转场频率和振幅下的响应。从跟踪游泳运动中获得的运动学特征，包括速度，进动角（摆动角）和重新定向时间（转弯速率），确定并揭示了无手游泳者的动态响应与流体粘度之间的非线性关系，流体粘度会产生阻力，从而降低推进速度和转弯速率。我们还发现游泳者运动的不同制度，这取决于流体粘度和游泳者的几何形状。类似的粘度和几何依赖观察到游泳者的转身率时，经历快速变化的领域方向。微游泳者在粘性流体中运动的特征结果将有助于开发具有两个或多个对称平面的其他简单游泳者的控制策略。特征推进运动学将有助于优化游泳器的设计和驱动方法，这对未来的低雷诺数应用至关重要。
Here we investigate the dynamic behavior of self-assembling achiral swimmers in viscous media. The response of magnetically actuated swimmers of two differing geometries is explored under various uniform rotational field frequencies and amplitudes. Kinematic characteristics obtained from tracked swimming motion, including speed, precession angle (wobbling angle), and re-orientation time (turning rate), are determined and reveal nonlinear relationships between the dynamic response of the achiral swimmers and fluid viscosity, which induces drag forces that reduce the speed of propulsion and turning rates. We also find distinct regimes of swimmer motion that are dependent on both fluid viscosity and swimmer geometry. Similar viscosity and geometric dependence is observed for turning rates of swimmers when undergoing rapid changes in field orientation. The characteristic results obtained for microswimmer motion in viscous fluids will contribute to the development of control strategies for propelling other simple swimmers with two or more planes of symmetry. Characterized propulsion kinematics will aid in the optimization of swimmer designs and actuation approaches, critical for future low Reynolds number applications.