Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
J Chem Phys. 2010 Jul 21;133(3):034906. doi: 10.1063/1.3457156.
The complexity of the coupling between soft particle deformation and fluid perturbation has limited studies of soft particle hydrodynamics to dilute suspensions. A hybrid Brownian dynamics-lattice Boltzmann method is presented that models nondilute soft spherical deformable particle (DP) suspensions in flow. Dependences on particle size and density are investigated for suspensions with over 100 DP. Multi-DP interactions lead to complex dependence of particle distributions on concentration and flow rate. Flow-induced DP migration toward channel center for DP in narrow channels is found. In wide channels, off-center peaks in the center of mass distribution for DP are found. The migration of DP leads to faster average speed of DP than the flow, which can be exploited for fractionating DPs of different sizes.
软粒子变形和流体扰动之间的耦合复杂性将软粒子流体动力学的研究限制在稀悬浮液中。本文提出了一种混合布朗动力学-格子玻尔兹曼方法，用于模拟流动中不稀的软球形可变形粒子（DP）悬浮液。研究了粒径和密度对超过 100 DP 的悬浮液的依赖性。多 DP 相互作用导致 DP 分布对浓度和流速的复杂依赖性。发现 DP 在窄通道中会向通道中心迁移，而在宽通道中，DP 的质心分布的中心会出现离中心的峰值。DP 的迁移导致 DP 的平均速度比流动速度快，这可以用于分离不同大小的 DP。
