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Sedimentation and redispersibility of magnetorheological suspensions while settling under gravity

机译：在重力下沉降时磁流变悬浮液的沉降和重新分配

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摘要

This work reports an investigation into the sedimentation stability and redispersibility of magnetorheological suspensions (MR suspensions). By applying a freeze sectioning method, slices of suspension layer were taken from a suspension column with minimum changes to shear history. The descent of the mudline was tracked, and the size distribution of particles contained in the suspension layer was studied using a laser scattering method. Oscillatory and steady shear was employed in studying the rheological flow behavior and viscoelasticity. Hydrodynamic force and particle interactions which have significant influence on those properties were analyzed in this study. In addition, indexes corresponding to sedimentation stability and redispersibility were put forward to make a quantitative comparison between three kinds of traditional MR suspension. The result shows that oleic acid could improve the sedimentation stability to a certain extent and hinder the formation of 'stiff cake', while nano-silica could significantly lower the sedimentation ratio but require considerable energy consumption to redisperse the suspension.
机译：这项工作报告了对磁体悬浮液（MR悬浮液）的沉降稳定性和再分散性的调查。通过施加冻结方法，将悬浮层的切片从悬浮柱中取出，以最小变化剪切历史。跟踪泥线的下降，并使用激光散射法研究悬浮层中包含的颗粒的尺寸分布。采用振荡和稳定剪切研究流变流动行为和粘弹性。在本研究中分析了对这些性质产生显着影响的流体动力学力和颗粒相互作用。此外，提出了对应于沉积稳定性和重新分散性的指标，以进行三种传统MR悬浮液之间的定量比较。结果表明，油酸可以在一定程度上改善沉降稳定性并阻碍形成“僵硬蛋白质”，而纳米二氧化硅可以显着降低沉降比，但需要相当大的能量消耗来重新分散悬浮液。

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