Red blood cells and other nonspherical capsules in shear flow: Oscillatory dynamics and the tank-treading-to-tumbling transition
Red blood cells and other nonspherical capsules in shear flow: Oscillatory dynamics and the tank-treading-to-tumbling transition
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DOI：
10.1103/physrevlett.98.078301
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发表时间：
2007-02-16
影响因子：
8.6
通讯作者：
Secomb, T. W.
中科院分区：
文献类型：
--
作者：
Skotheim, J. M.;Secomb, T. W.
我们考虑红细胞和其他非球形微胶囊稀悬浮在一个简单的剪切流的运动。我们的分析表明，取决于粘度，膜的弹性，几何形状和剪切速率，颗粒表现出翻滚，坦克踩踏的膜的粘性内部与周期性振荡的取向角，或间歇性的行为，其中两种模式交替发生。对于红细胞，我们计算出完整的相图，并确定了一个新的坦克踩踏翻滚过渡的剪切速率降低。对这种运动的观测加上我们的理论框架，可能会提供一种评估胶囊特性的敏感手段。
We consider the motion of red blood cells and other nonspherical microcapsules dilutely suspended in a simple shear flow. Our analysis indicates that depending on the viscosity, membrane elasticity, geometry, and shear rate, the particle exhibits either tumbling, tank-treading of the membrane about the viscous interior with periodic oscillations of the orientation angle, or intermittent behavior in which the two modes occur alternately. For red blood cells, we compute the complete phase diagram and identify a novel tank-treading-to-tumbling transition as the shear rate decreases. Observations of such motions coupled with our theoretical framework may provide a sensitive means of assessing capsule properties.