用晶格Boltzmann方法研究微血管脉动流中悬浮颗粒运动特征的转变

广西师范大学学报（自然科学版） ›› 2011, Vol. 29 ›› Issue (4): 7-11.

用晶格Boltzmann方法研究微血管脉动流中悬浮颗粒运动特征的转变

邱冰, 王立龙, 薛泽, 李华兵

桂林电子科技大学材料科学与工程学院,广西桂林541004

收稿日期:2011-07-02 发布日期:2018-11-16
通讯作者: 李华兵(1972—),男,广西宜州人,桂林电子科技大学教授,博士。E-mail:hbli@guet.edu.cn
基金资助:
国家自然科学基金资助项目(10747004,11065006)

Kinetics Characteristic Transitionof Suspended Particle in a Pulsating Flow in Microvessel by Lattice Boltzmann Simulation

QIU Bing, WANG Li-long, XUE Ze, LI Hua-bing

School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin Guangxi 541004,China

Received:2011-07-02 Published:2018-11-16

摘要/Abstract

摘要： 用二维晶格Boltzmann方法研究球形刚性悬浮颗粒在微血管脉动流中的迁移运动。悬浮颗粒的直径与人体正常红细胞的尺寸相当,微血管的直径是颗粒直径的四倍,血浆被看作牛顿流体,粒子边界的流体作用力用压力张量积分法计算。模拟结果显示,当液体流速与正常血液流速相当时,Segré-Silberberg效应不会出现,只有当液体流速增大到一定数值时,Segré-Silberberg效应才得以呈现。在流速逐渐增大的过程中观察悬浮粒子平衡位置的变化情况,可以看到平衡位置的变化并非连续,而是显示出类似“量子化”的特征。这与宏观流体中的颗粒迁移运动特征有着显著区别,揭示了从微流动过渡到宏观流动的过程中流体动力学特征的演化过程。

关键词: 晶格Boltzmann方法, 脉动流, 微血管, Segré-Silberberg效应

Abstract: A lattice Boltzmann model of two-dimensions is usedto simulate the movement of rigid suspended particle in a pulsating flow in micro vessel.The particle is as big as a red blood cell,and the micro vessel is four times as wide as the diameter of the particle.The plasma is viewed as Newtonian flow,and the hydrodynamic force is calculated by integrating the stress tensoron the boundary of it.It is found that Segré-Silberberg effect does not present when the flow velocity is on the same level with human blood,and it only presents when the flow velocity is increased to a rather high level.During the increase of flow velocity,the change of equilibrium position is seen to be not continuous but discrete,showing differen from the characteristic of the drift in macroflow,which reveals the dynamics transition from micro flow to macro flow.

Key words: lattice Boltzmann method, pulsating flow, microvessel, Segré-Silberberg effect

中图分类号:

O540

邱冰, 王立龙, 薛泽, 李华兵. 用晶格Boltzmann方法研究微血管脉动流中悬浮颗粒运动特征的转变[J]. 广西师范大学学报（自然科学版）, 2011, 29(4): 7-11.

QIU Bing, WANG Li-long, XUE Ze, LI Hua-bing. Kinetics Characteristic Transitionof Suspended Particle in a Pulsating Flow in Microvessel by Lattice Boltzmann Simulation[J]. Journal of Guangxi Normal University(Natural Science Edition), 2011, 29(4): 7-11.

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