Misbah Chaouqi
Laboratoire de Spectrométrie Physique, UMR, Université Joseph Fourier and CNRS, 140 avenue de la physique, 38402 Saint Martin d'Heres, France.
Phys Rev Lett. 2006 Jan 20;96(2):028104. doi: 10.1103/PhysRevLett.96.028104. Epub 2006 Jan 18.
The dynamics of vesicles under a shear flow are analyzed analytically in the small deformation regime. We derive two coupled nonlinear equations which describe the vesicle orientation in the flow and its shape evolution. A new type of motion is found, namely, a "vacillating-breathing" mode: the vesicle orientation undergoes an oscillation around the flow direction, while the shape executes breathing dynamics. This solution coexists with tumbling. Moreover, we provide an explicit expression for the tumbling threshold. A rheological law for a dilute vesicle suspension is outlined.
在小变形 regime 下，对剪切流作用下囊泡的动力学进行了分析。我们推导了两个耦合的非线性方程，它们描述了囊泡在流场中的取向及其形状演变。发现了一种新型运动，即“摆动 - 呼吸”模式：囊泡取向围绕流动方向进行振荡，而形状则执行呼吸动力学。该解与翻滚共存。此外，我们给出了翻滚阈值的显式表达式。概述了稀囊泡悬浮液的流变学定律。
