论文标题
纤毛结构检测粒子检测的弯曲波动机制
A bending fluctuation-based mechanism for particle detection by ciliated structures
论文作者
论文摘要
为了模仿被动生物纤毛在复杂流体中的机械响应，我们研究了提交给剪切下稀释颗粒悬浮液的锚固弹性纤维的弯曲动力学。我们表明，纤维的弯曲波动准确编码了颗粒悬浮液浓度的微小变化。实际上，除了连续相流动引起的固定弯曲外，每个粒子的通过还会引起额外的偏转。我们证明，主要的颗粒/纤维相互作用来自颗粒与纤维的直接接触，我们提出了一个简单的弹性水力动力学模型来预测其振幅。我们的结果阐明了生物纤毛的极端机械灵敏度，以检测其附近固体颗粒的存在，并带来一个物理框架来描述其在颗粒流中的动态。
To mimic the mechanical response of passive biological cilia in complex fluids, we study the bending dynamics of an anchored elastic fiber submitted to a dilute granular suspension under shear. We show that the bending fluctuations of the fiber accurately encode minute variations of the granular suspension concentration. Indeed, besides the stationary bending induced by the continuous phase flow, the passage of each single particle induces an additional deflection. We demonstrate that the dominant particle/fiber interaction arises from direct contacts of the particles with the fiber and we propose a simple elastohydrodynamics model to predict their amplitude. Our results shed light on the extreme mechanical sensitivity of biological cilia to detect the presence of solid particles in their vicinity and bring a physical framework to describe their dynamics in particulate flows.
