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arXiv 1703.00611physics.flu-dyn
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基于混合物理论的红细胞诱导血小板转运

Transport of platelets induced by red blood cells based on mixture theory

Wei-Tao Wu, Nadine Aubry, James F. Antaki, Mehrdad Massoudi

摘要:

血栓形成是手术植入血液接触装置后的常见并发症,并且受到血小板近壁富集现象的强烈影响。本文介绍了一种多组分连续介质的方法来研究这一现象。混合理论模型用于描述血浆和红细胞(RBC)的运动以及两种成分之间的相互作用。建立了一个输运模型,研究了红细胞场对血小板的影响。该模型用于研究矩形微通道中的血液流动,突然膨胀的微通道,和含有微裂缝的通道(代表在大多数血液润湿装置中遇到的实际问题)。模拟表明,在矩形通道中,靠近壁的血小板浓度比通道中心线附近的浓度高约5倍。还注意到,在具有裂缝的通道中,非常大量的血小板聚集在裂缝的深部,并且这可以用作医疗装置中发生的血栓形成的病灶。关键词:血小板;血流;红细胞;微通道;混合物理论;双流体;血栓形成

英文摘要:

Thrombosis is a common complication following the surgical implantation of blood contacting devices, and is strongly influenced by the phenomenon of near-wall enrichment of platelets. This paper describes a multi-constituent continuum approach to study this phenomenon. A mixture-theory model is used to describe the motion of the plasma and the red blood cells (RBCs) and the interactions between the two components. A transport model is developed to study the influence of the RBC field on the platelets. The model is used to study blood flow in a rectangular micro-channel, a sudden expansion micro-channel, and a channel containing micro crevices (representing a practical problem encountered in most blood-wetted devices). The simulations show that in the rectangular channel the concentration of platelets near the walls is about five times higher than the concentration near the centerline of the channel. It is also noticed that in the channel with crevices, extremely a large number of platelets accumulate in the deep part of the crevices and this may serve as the nidus for thrombosis occurring in medical devices. Keywords: Platelets; Blood flow; RBCs; Micro-channel; Mixture theory; Two-fluids; Thrombosis

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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