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  

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

作　　者：邱冰[1] 王立龙[1] 薛泽[1] 李华兵[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《广西师范大学学报（自然科学版）》2011年第4期7-11,共5页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(10747004;11065006)

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。A lattice Boltzmann model of two-dimensions is used to 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 tensor on the boundary of it. It is found that Segre-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 macro flow,which reveals the dynamics transition from micro flow to macro flow.

关 键 词：晶格Boltzmann方法 脉动流 微血管 Segré-Silberberg效应 

分 类 号：O540[理学—物理] O340