电流变液的固态结构

电流变体系在外场作用下形成一定的固态结构,而其性能与所形成的结构密切相关.不考虑体系非静电力时,体系自由能为静电能的负值,而静电能与有效介电常数成正比.基于Maxwell-Wagner模型,推导出有效介电常数关于颗粒体积比的一系列正幂项解析表达式,计算球颗粒悬浮于介质或导电液体中构成的3种立方结构的有效介电常数.计算结果表明:电流变体系中球颗粒为介质球或是导体球构成3种立方结构中FCC结构具有最低的自由能.电流变液在由液相向固相转变的过程中,形成的固态结构为FCC结构.

Solid State Structure of Electrorheological Fluids

Under applied electric field,electrorheological fluids will form solid state structure which is correlated the performance.In the absence of nonelectrostatic forces,the free energy of system is equal to the negative value of electrostatic energy which is proportion to effective dielectric constants.Based on the Maxwell-Wagner model,an analytical formula for the effective dielectric constants is derived as a series expansion in powers of the volume fraction of spheres.Effective dielectric constants of three s cubic lattices of dielectric or conducting particles suspending in dielectric or conducting fluids are calculated.Our numerical results show that among the three cubic lattices which are formed by dielectric or conducting spheres in electrorheological fluids,the FCC one exhibits the smallest free energy,this show that during the electrorheological fluids transition process from the solid state to the liquid state,the solid state formed by the system is a FCC one.