摘要
基于偶极近似 ,运用电极化方法 ,定量研究了电流变液中悬浮颗粒在外电场作用下其体积和形状的变化 ,并计算了其体积和形状的相对变化率 .研究结果表明 :悬浮颗粒的体积和形状的相对变化率均与电场强度的平方成正比 ,并与ER本身的性质有关 .一般情况下 ,颗粒的体积和形状的相对变化率分别为 8.4 %和 12 .5 % ,对总体积变化率的贡献为 1.6 8% .这种变化对于ER系统的电涨和电热都作出了贡献 ,仅当将颗粒当作刚性球时 ,其自由能才与电场强度的平方成正比 .
Based on the dipolar approximation, the change of volume and shape of particles suspended in electro-rheological fluids (ER) are investigated by using the electric polarization method. The relative variational rate is calculated for the volume and shape of particles. The results of computation show that the relative variational rate of the volume and shape of particles is in direct proportion to the square of electric field intensity, and relates to the character of ER. The relative variational rate of the volume and shape of particles is 8.4% and 12.5%, and the contribution to integral volume is 1.68% under the general condition. The contribution is devised by the change for electrodilatancy and electric heating of ER. The free energy is in direct proportion to the square of electric field intensity when particles are imagined as rigid balls.
基金
湖南省教育厅自然科学基金资助课题 (0 2C30 7)
湖南省教育厅项目自然科学基金资助课题 (0 1C30 8)
