Pressure-driven occlusive flow of a confined red blood cell.

Pressure-driven occlusive flow of a confined red blood cell.
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压力驱动的受限红细胞闭塞流动。

DOI:
10.1039/c5sm01282a
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发表时间:
2016
期刊:
影响因子:
3.4
通讯作者:
Mahadevan,L
Mahadevan,L
中科院分区:
化学2区
文献类型:
--
作者:
Savin,Thierry;Bandi,MM;Mahadevan,L

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当红细胞(RBC)通过微循环中狭窄的毛细血管时,它们在流动时变形。在镰状细胞病和疟疾等病理生理过程中,RBC运动和流动受到严重限制。为了理解这种阻塞阈值,我们使用实验和理论相结合的方法来研究单个肿胀红细胞通过不同内径的狭窄玻璃毛细管的运动。通过跟踪运动的挤压细胞,因为它是由一个控制的压力降驱动,我们测量的RBC速度作为压力梯度的函数,以及当地的毛细血管直径,并发现,在这个制度中的有效血液粘度增加与降低RBC速度和管半径以下的幂律,取决于封闭的细胞的长度。我们的观察结果与一个简单的弹性流体动力学模型是一致的,并强调了侧向约束的作用,在封闭的压力驱动的缓慢流动的软限制对象。
When red blood cells (RBCs) move through narrow capillaries in the microcirculation, they deform as they flow. In pathophysiological processes such as sickle cell disease and malaria, RBC motion and flow are severely restricted. To understand this threshold of occlusion, we use a combination of experiment and theory to study the motion of a single swollen RBC through a narrow glass capillary of varying inner diameter. By tracking the movement of the squeezed cell as it is driven by a controlled pressure drop, we measure the RBC velocity as a function of the pressure gradient as well as the local capillary diameter, and find that the effective blood viscosity in this regime increases with both decreasing RBC velocity and tube radius by following a power-law that depends upon the length of the confined cell. Our observations are consistent with a simple elasto-hydrodynamic model and highlight the role of lateral confinement in the occluded pressure-driven slow flow of soft confined objects.
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