A computer simulation study of multiphase squeezing flows
A computer simulation study of multiphase squeezing flows
复制标题
多相挤压流的计算机模拟研究
DOI：
10.1063/1.1461372
复制
发表时间：
2002
影响因子：
4.6
通讯作者：
A. Ladd
中科院分区：
文献类型：
--
作者：
Jonghoon Lee;A. Ladd
稠密胶体悬浮液的流变性对颗粒表面性质的改变很敏感。我们正在使用格子Boltzmann模拟来研究聚合物涂层对平行板之间挤压流动的影响。在这项研究中，我们使用固定和移动颗粒的随机阵列作为聚合物涂层的最简单模型。计算了缝隙内的流场和板间的作用力，并与基于Stokes方程和Brinkman方程的解析解进行了比较。我们的模型跨越了聚合物涂层的极限特性，即粘性悬浮液和多孔介质。我们发现，即使在涂层厚度只有几个布林克曼屏蔽长度的情况下，模拟结果和解析解之间也有很好的一致性。
The rheology of dense colloidal suspensions is sensitive to modifications in the surface properties of the particles. We are using lattice Boltzmann simulations to investigate the effects of polymer coatings on the squeezing flow between parallel plates. In this study, we used random arrays of stationary and mobile particles as the simplest models of the polymer coat. We have calculated the flow field in the gap and the force between the plates, and have compared the simulation results with analytic solutions based on the Stokes and Brinkman equations. Our models span the limiting characteristics of a polymer coated layer; namely a viscous suspension and a porous medium. We find good agreement between simulations and analytic solutions, even when the coat thickness is only a few Brinkman screening lengths.