体积分数及粒径对石油基电流变液特性的影响

The Effect of Volume Fraction and Particle Diameter on Properties of Petroleum-Based ERF

考察了石油基电流变液分散相的体积分数及粒径对电流变液特性的影响 ,发现随体积分数的增加剪切应力呈指数上升 ,电流密度变化较小 ;粒径增大 ,电流变液的零场剪切应力变小 ,电流密度变大 ;不同粒径的电流变液 ,其剪切应力与电场强度呈线性关系 ,且随电场强度的增加速率基本相等。试验中发现 ,体积分数≥ 40 % ,且有粒径较大的微粒存在 ,当电场强度超过某一临界值时 ,剪切应力随电场强度增加速率迅速提高 ,但与电场强度的线性关系不变。用郝田的逾渗理论和Hayter配分函数概念解释了这一现象。

The effects of volume fraction and particle diameter of dispersed phase on properties of ERF(electrorheological fluid) with carbonaceous particles based on FCC decant oil have been investigated.The results show that shear stress increases exponentially with volume fraction,while current density changes only slightly.In zero electrical field,shear stress decreased with increasing particle diameter,while current density increased.Shear stress of ERF,of which dispersed particle diameters are different,increased linearly with electric field. Under certain conditions,shear stress increases rapidly with eleetric field.The phenomena can be explained by Haotian's theory and Hayter's partition function concept.