Danker Gerrit, Vlahovska Petia M, Misbah Chaouqi
Laboratoire de Spectrométrie Physique, UMR, 140 avenue de la physique, Université Joseph Fourier Grenoble, and CNRS, 38402 Saint Martin d'Heres, France.
Phys Rev Lett. 2009 Apr 10;102(14):148102. doi: 10.1103/PhysRevLett.102.148102.
Blood microcirculation critically depends on the migration of red cells towards the flow centerline. We identify theoretically the ratio of the inner over the outer fluid viscosities lambda as a key parameter. At low lambda, the vesicle deforms into a tank-treading ellipsoid shape far away from the flow centerline. The migration is always towards the flow centerline, unlike drops. Above a critical lambda, the vesicle tumbles or breaths and migration is suppressed. A surprising coexistence of two types of shapes at the centerline, a bulletlike and a parachutelike shape, is predicted.
血液微循环严重依赖于红细胞向流动中心线的迁移。我们从理论上确定了内、外流体粘度比λ为关键参数。在低λ时，囊泡在远离流动中心线处变形为踏车状椭球体。与液滴不同，其迁移总是朝向流动中心线。在临界λ以上，囊泡翻滚或波动，迁移受到抑制。预测在中心线会出现两种形状的惊人共存，即子弹状和平伞状。
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