Microstructure from simulated Brownian suspension flows at large shear rate
Microstructure from simulated Brownian suspension flows at large shear rate
复制标题
大剪切速率下模拟布朗悬浮液流动的微观结构
DOI：
10.1063/1.1476745
复制
发表时间：
2002
影响因子：
4.6
通讯作者：
B. Katyal
中科院分区：
文献类型：
--
作者：
J. Morris;B. Katyal
利用Stokesian动力学技术，通过对动态模拟的位形取样，研究了单剪切流中浓缩布朗悬浮液的微观结构。模拟的运动是三维的，具有周期性的边界条件，以模拟无限延伸的悬架。通过牛顿流体和布朗运动产生的流体动力相互作用是影响单分散硬球粒子运动的唯一物理因素。表征悬浮液的无量纲参数是颗粒体积分数和Peclet数，分别定义为φ=(4π/3)Na3，n为数密度，a为球半径，Pe=6πηγA3/kT，η为流体粘度，γ为剪切速率，KT为热能。报告的大多数结果来自Pe=1000时的模拟；在Pe=1、25和100时的模拟结果也报告了φ=0.3和φ=0.45时的结果。配对结构由配对分布函数g(R)=P_1|1(R)/n表征，其中P_1|1(R)为条件。
Pair microstructure of concentrated Brownian suspensions in simple-shear flow is studied by sampling of configurations from dynamic simulations by the Stokesian Dynamics technique. Simulated motions are three dimensional with periodic boundary conditions to mimic an infinitely extended suspension. Hydrodynamic interactions through Newtonian fluid and Brownian motion are the only physical influences upon the motion of the monodisperse hard-sphere particles. The dimensionless parameters characterizing the suspension are the particle volume fraction and Peclet number, defined, respectively, as φ=(4π/3)na3 with n the number density and a the sphere radius, and Pe=6πηγa3/kT with η the fluid viscosity, γ the shear rate, and kT the thermal energy. The majority of the results reported are from simulations at Pe=1000; results of simulations at Pe=1, 25, and 100 are also reported for φ=0.3 and φ=0.45. The pair structure is characterized by the pair distribution function, g(r)=P1|1(r)/n, where P1|1(r) is the condi...