Aouane Othmane, Thiébaud Marine, Benyoussef Abdelilah, Wagner Christian, Misbah Chaouqi
Department of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany and Université Grenoble Alpes, LIPHY, F-38000 Grenoble, France and LMPHE, URAC 12, Faculté des Sciences, Université Mohammed V-Agdal, Rabat, Morocco.
Université Grenoble Alpes, LIPHY, F-38000 Grenoble, France.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Sep;90(3):033011. doi: 10.1103/PhysRevE.90.033011. Epub 2014 Sep 18.
Red blood cells (RBCs) are the major component of blood, and the flow of blood is dictated by that of RBCs. We employ vesicles, which consist of closed bilayer membranes enclosing a fluid, as a model system to study the behavior of RBCs under a confined Poiseuille flow. We extensively explore two main parameters: (i) the degree of confinement of vesicles within the channel and (ii) the flow strength. Rich and complex dynamics for vesicles are revealed, ranging from steady-state shapes (in the form of parachute and slipper shapes) to chaotic dynamics of shape. Chaos occurs through a cascade of multiple periodic oscillations of the vesicle shape. We summarize our results in a phase diagram in the parameter plane (degree of confinement and flow strength). This finding highlights the level of complexity of a flowing vesicle in the small Reynolds number where the flow is laminar in the absence of vesicles and can be rendered turbulent due to elasticity of vesicles.
红细胞（RBCs）是血液的主要成分，血液流动由红细胞流动决定。我们使用由封闭双层膜包裹流体组成的囊泡作为模型系统，来研究受限泊肃叶流作用下红细胞的行为。我们广泛探究两个主要参数：（i）囊泡在通道内的受限程度和（ii）流动强度。揭示了囊泡丰富而复杂的动力学，范围从稳态形状（降落伞和拖鞋形状）到形状的混沌动力学。混沌通过囊泡形状的一系列多次周期性振荡产生。我们在参数平面（受限程度和流动强度）的相图中总结了我们的结果。这一发现突出了在小雷诺数下流动囊泡的复杂程度，在没有囊泡时流动是层流，而由于囊泡的弹性可变为湍流。
