具有剪切稀化的节俭游泳
Thrifty swimming with shear-thinning
摘要：
微尺度推进是许多生物医学系统的组成部分，例如生物膜形成和人类生殖，其中周围的流体包括聚合物的悬浮液。这些聚合物赋予流体非牛顿流变特性，如剪切稀化和粘弹性。因此，非牛顿流体的复杂动力学提出了许多建模挑战，强烈激励实验研究。在这里，我们表明，未能占“出平面”的影响时，通过剪切稀化流体的波动游泳的实验数据分析结果在一个显着高估模型游泳者C周围的流体粘度。优雅这种对粘度的错误计算对应于高估了游泳者消耗的力量，这是一个对理解游泳者内部力学很重要的关键生物物理量。随着实验流跟踪技术的改进，使用该技术的功耗的准确实验估计将出现在类似的波动系统中，例如人类精子通过宫颈粘液的平面跳动，将需要探测内部发电，流体流变学和所得波形之间的相互作用。
英文摘要：
Microscale propulsion is integral to numerous biomedical systems, for example biofilm formation and human reproduction, where the surrounding fluids comprise suspensions of polymers. These polymers endow the fluid with non-Newtonian rheological properties, such as shear-thinning and viscoelasticity. Thus, the complex dynamics of non-Newtonian fluids presents numerous modelling challenges, strongly motivating experimental study. Here, we demonstrate that failing to account for "out-of-plane" effects when analysing experimental data of undulatory swimming through a shear-thinning fluid results in a significant overestimate of fluid viscosity around the model swimmer C. elegans. This miscalculation of viscosity corresponds with an overestimate of the power the swimmer expends, a key biophysical quantity important for understanding the internal mechanics of the swimmer. As experimental flow tracking techniques improve, accurate experimental estimates of power consumption using this technique will arise in similar undulatory systems, such as the planar beating of human sperm through cervical mucus, will be required to probe the interaction between internal power generation, fluid rheology, and the resulting waveform.
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