电流变液体的非线性的交变电流效应

Alternating Current Response of Nonlinear Electrorheological Fluids

借助于自洽平均场理论和微扰展开法,研究了非线性ER流体的交变电流效应,导出具有非线性介电响应的球形颗粒在交变电场下的平均电偶极矩以及它的谐波效应,进一步获得了高阶谐波的平均电偶极矩和局域电场.研究结果表明,当颗粒间距较小以及ER流体组分的介电常数配比较大时,必须考虑颗粒间的多极矩相互作用.

Using self-consistent mean field theory and series perturbative expansion, we investigated the nonlinear response of a nonlinear ER fluid consisting of nonlinear spherical particles and linear substrate. Under a sinusoidal (ac) field, the electrical response of a nonlinear ER fluid contains generally the contributions of higher-order harmonics. We give the dipole moment of nonlinear spherical particles its harmonic response. Further, we obtain the analytic expressions of the higher harmonics of dipole moment and the averaged local field. Our numerical results show that it is important to take the multiple image interaction into account in the case of small distance between particles and large dielectric contrast.