Shape transition and propulsive force of an elastic rod rotating in a viscous fluid.
Shape transition and propulsive force of an elastic rod rotating in a viscous fluid.
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粘性流体中旋转的弹性杆的形状转变和推进力。
DOI：
10.1103/physrevlett.100.078101
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发表时间：
2007
影响因子：
8.6
通讯作者：
K. Breuer
中科院分区：
文献类型：
--
作者：
B. Qian;T. Powers;K. Breuer
被认为是在粘性流体中旋转的弹性杆的变形，与鞭毛运动的应用程序。杆相对于旋转轴倾斜，并且实验和理论被用来研究在恒定转矩或恒定速度驱动时的形状转变。在低施加扭矩，杆轻轻弯曲，并产生小的推进力。在临界扭矩下，旋转速度突然增加，并且杆形成螺旋形状，具有增加的推进力。我们发现理论和实验之间的良好协议。一个简单的物理模型来捕捉和解释的基本行为。
The deformation of an elastic rod rotating in a viscous fluid is considered, with applications related to flagellar motility. The rod is tilted relative to the rotation axis, and experiments and theory are used to study the shape transition when driven either at constant torque or at constant speed. At low applied torque, the rod bends gently and generates small propulsive force. At a critical torque, the rotation speed increases abruptly, and the rod forms a helical shape with increased propulsive force. We find good agreement between theory and experiment. A simple physical model is presented to capture and explain the essential behavior.