Swinging of red blood cells under shear flow
Swinging of red blood cells under shear flow
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DOI：
10.1103/physrevlett.98.188302
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发表时间：
2007-05-04
影响因子：
8.6
通讯作者：
Viallat, Annie
中科院分区：
文献类型：
--
作者：
Abkarian, Manouk;Faivre, Magalie;Viallat, Annie
我们发现，在中等剪切应力（eta gamma 大约为 0.1 Pa）下，红细胞呈现出与长期观察到的稳定坦克踩踏（TT）运动叠加的倾斜（摆动）振荡。基于初始不受应变的粘弹性膜（形状记忆）包围的流体椭球体的模型预测了所有观察到的运动特征：随着 eta gamma 的减小，摆动幅度和周期（TT 周期的 1/2）均增加，eta gamma 触发的过渡到连续摆动和翻滚的窄 eta gamma 范围间歇状态，以及低 eta gamma 值时的纯翻滚。
We reveal that under moderate shear stress (eta gamma approximate to 0.1 Pa) red blood cells present an oscillation of their inclination (swinging) superimposed to the long-observed steady tank treading (TT) motion. A model based on a fluid ellipsoid surrounded by a viscoelastic membrane initially unstrained (shape memory) predicts all observed features of the motion: an increase of both swinging amplitude and period (1/2 the TT period) upon decreasing eta gamma, a eta gamma-triggered transition toward a narrow eta gamma range intermittent regime of successive swinging and tumbling, and a pure tumbling at low eta gamma values.