物理化学学报 >> 2009, Vol. 25 >> Issue (02): 207-212.doi: 10.3866/PKU.WHXB20090202

研究论文 上一篇    下一篇

重力对溶液悬浮粒子聚集过程影响的布朗动力学模拟

李旭; 徐升华; 孙祉伟   

  1. 中国科学院力学研究所, 国家微重力实验室, 北京 100190
  • 收稿日期:2008-09-09 修回日期:2008-10-12 发布日期:2009-01-16
  • 通讯作者: 孙祉伟 E-mail:sunzw@imech.ac.cn

A Brownian Dynamics Simulation to Study the Influence of Gravity on the Process of Particle Coagulation in Suspension

LI Xu; XU Sheng-Hua; SUN Zhi-Wei   

  1. National Microgravity Laboratory (NML), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2008-09-09 Revised:2008-10-12 Published:2009-01-16
  • Contact: SUN Zhi-Wei E-mail:sunzw@imech.ac.cn

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摘要： 采用布朗动力学的计算机模拟方法, 研究重力因素对于稀溶液中悬浮粒子聚集过程的影响. 通过在计算机模拟程序中加入和排除重力因素的影响, 对不同重力条件下的粒子团数量随时间的变化曲线进行对比研究, 得到了重力对溶液中的粒子团总数和不同大小的粒子团数量随时间变化的影响规律，可以总结为: 在聚集阶段初期，重力不影响粒子的聚集; 而在聚集阶段后期, 重力加快了粒子的聚集. 同时, 从动力学分析的角度出发, 对重力如何影响悬浮溶液中粒子聚集过程的机制也进行了更加深入的探讨.

关键词: 布朗动力学方法, 重力, 悬浮粒子, 稀溶液, 聚集, 粒子聚集团

Abstract: The Brownian dynamics method was used to simulate the influence of gravity on the process of particle coagulation in a dilute solution. By including or excluding the gravitational influence in a computer simulation, the relative change in the number of aggregates with time for these two gravitational conditions could be compared. Time-dependent variations of the number and size of all aggregates under the gravitational conditions were obtained. We conclude that the influence of gravity is negligible during the earlier stage of the coagulation process and that the rate of aggregation is accelerated by the gravitational force in the latter stage. The effect of gravitational force on the process of particle aggregation in suspension is discussed by using a dynamic analysis method.

Key words: Brownian dynamics method, Gravity, Particles in suspension, Diluted solution, Coagulation, Aggregates