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arXiv 1602.07044physics.bio-phcond-mat.softphysics.flu-dyn
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红细胞通过对称和非对称分叉血管的微观模拟

A micro-scale simulation of red blood cell passage through symmetric and asymmetric bifurcated vessels

Tong Wang, Uwitije Rongin, Zhongwen Xing

摘要:

血液在微毛细管中表现出血细胞比容、流速和有效粘度的异质性。微血管分叉对血细胞的分布和血液流动行为有重要影响。本文对具有发散分叉和会聚分叉的微血管中多个红细胞的二维运动和变形进行了模拟研究。结合流体动力学和膜力学。本文研究了红细胞形状、红细胞压积和细胞膜变形能力对红细胞流变行为和血液动力学的影响。结果表明,以较高流速进入子分支的血液倾向于接受更多的细胞。结果还表明,红细胞在微血管经历了横向迁移的母通道和钝化的速度分布在直段和子分支,这种效果受到影响的形状和初始位置的细胞,红细胞压积,和膜变形能力。此外,观察到汇合尖端周围的无细胞区域。模拟结果与现有的实验结果定性一致。本研究为更好地理解微尺度血流动力学行为提供了基础知识。

英文摘要:

Blood exhibits a heterogeneous nature of hematocrit, velocity, and effective viscosity in microcapillaries. Microvascular bifurcations have a significant influence on the distribution of the blood cells and blood flow behavior. This paper presents a simulation study performed on the two-dimensionalmotions and deformation of multiple red blood cells in microvessels with diverging and converging bifurcations. Fluid dynamics and membrane mechanics were incorporated. Effects of cell shape, hematocrit, and deformability of the cell membrane on rheological behavior of the red blood cells and the hemodynamics have been investigated. It was shown that the blood entering the daughter branch with a higher flow rate tended to receive disproportionally more cells. The results also demonstrate that red blood cells in microvessels experienced lateral migration in the parent channel and blunted velocity profiles in both straight section and daughter branches, and this effect was influenced by the shape and the initial position of the cells, the hematocrit, and the membrane deformability. In addition, a cell free region around the tip of the confluence was observed. The simulation results are qualitatively consistent with existing experimental findings. This study may provide fundamental knowledge for a better understanding of hemodynamic behavior of micro-scale blood flow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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