颗粒质量导致的电流变液结构演化特征

考虑电流变液颗粒质量的影响及多粒子近程相互作用,利用等效平板电导模型,由分子动力学方法模拟了泊肃叶流动状态下电流变液结构的演化过程特征;设计制作了实验装置,观测了泊肃叶流动行为,并与模拟结果进行比较.研究表明:在外电场作用下,计及颗粒质量效应后,电流变液结构演化中跃迁区速度变化的峰值减小,进入柱塞区状态的时间延长,柱塞区的宽度加大,且颗粒质量越大,效应越显著.实验观测的泊肃叶流动行为与模拟结果基本相符,且观察到极板壁上的颗粒静止不动,证明了“极板壁上颗粒静止不动”这一假设的正确性 关键词： 电流变液 泊肃叶流动 等效平板电导模型 结构演化

Structure evolution features of electro-rheological fluids induced by particles' mass

Considering the mass effect and the short-range interaction of multi-particles, we conducted a molecular dynamic simulation of the structural evolution features of electro-rheological (ER) fluids based upon the equivalent conduction model. We also devised and constructed an equipment, then observed the Poiseuille flow. The results of the experiment were compared with those of simulation. The conclusion is that, when the mass effect is considered, the peak-value of the changing velocity in transition zone decreases, and the period to form the plug zone prolongs. The effect becomes remarkable with the increasing particles' mass and the width of the plug zone. The Poiseuille flow observed in the experiment is in accord with the simulation. The particles clinging to the electrodes are stationary, which testifies the prophecy (particles clinging to the electrodes are stationary).