一种微粒相互作用及其介电泳动力学仿真新方法

A Novel Approach to Simulate Particle-Particle Interaction and Dielectrophoretic Dynamics

采用有限元法进行粒子电极化强度的计算,以此得到对应的介电泳力和次级介电泳力.粒子的极化强度依托软件COMSOL Multiphysics 5.3a的AC/DC模块计算得到,粒子追踪模块用于实现介电泳力、次级介电泳力、流体力,以及排斥力的粒子动力学仿真.AC/DC模块和粒子追踪模块的多物理场耦合新方法能够满足正、负介电泳效应的粒子运动分析和研究,且粒子轨迹与常用的粒子仿真算法的运算结果有较高的相似性.同时仿真结果还表明,为了更准确地预测实验观测结果,粒子承受金属电极形成的正、负介电泳效应需要考虑次级介电泳力.

Electrical polarization strength of a particle is calculated by finite element method to obtain the dielectrophoretic and the secondary dielectrophoretic forces.Relying on the commercial software COMSOL Multiphysics 5.3a,the electrical polarization strength can be obtained in the AC/DC module from COMSOL,and then the module of particle tracing for fluid flow(PTF)is used to realize the dynamic simulation of particles on which the dielectrophoretic force,secondary dielectrophoretic force,fluid force and repulsive force are exerted.This novel method in which AC/DC module coupled PTF module in multi-physical fields provides an insight into the particle trajectories with positive or negative dielectrophoresis,which has a good agreement in other particle simulation methods.Whatever positive or negative dielectrophoresis is,these results imply that it is essential to consider secondary dielectrophoretic effect on metal electrodes to improve the prediction of experimental observation.