流体动力学作用对粒子聚集影响的布朗动力学模拟-中国科学院力学.PDF

物理化学学报(Wuli Huaxue Xuebao) 2130 Acta Phys. -Chim. Sin., 2009, 25(10)：2130-2136 October [Article] 流体动力学作用对粒子聚集影响的布朗动力学模拟 李 旭 徐升华 孙祉伟* (中国科学院微重力重点实验室, 中国科学院力学研究所, 北京 100190) 摘要：采用布朗动力学模拟方法, 研究了流体动力学作用对稀溶液中悬浮粒子聚集过程的影响. 模拟中忽略了 一个粒子同时与多个粒子碰撞聚集的可能, 引入了前人有关两粒子间流体动力学作用影响的研究成果. 模拟结 果证实了流体动力学的作用在比较大的幅度上减缓了粒子的聚集过程, 是导致粒子聚集速率的实验值低于 Smoluchowski 理论值的重要原因之一. 另外, 在分别加入和排除重力作用, 以及考虑和忽略粒子间流体动力学作 用在内的各种条件下模拟了粒子的聚集过程, 得到了两种因素相互耦合作用时各因素对粒子聚集过程影响的结 果, 并从动力学的角度对这些因素的影响机制进行了相应的讨论. 关键词：布朗动力学方法; 流体动力学作用; 悬浮粒子; 稀溶液; 聚集 中图分类号： O641; O648 Brownian Dynamics Simulation of the Influence of Hydrodynamic Interaction on Particle Coagulation LI Xu XU Sheng-Hua SUN Zhi-Wei * (Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P. R. China) Abstract ： Brownian dynamics method was used to simulate the influence of hydrodynamic interaction on the suspension particle coagulation process in a dilute solution. In the simulation, the possibility of one particle colliding simultaneously with more than two particles was ignored and results from previous studies concerned with the hydrodynamic interaction between two particles were used. Our simulations confirm that the hydrodynamic interaction slows the coagulation process down greatly and this is an important reason for the experimental values of the coagulation rate being sig