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Particle sedimentation in magnetorheological fluid and its effect

Particle sedimentation is one of the main issues affecting magnetorheological fluids (MRF). Though short-term testing methods are useful for their development, such methods have not looked into the effect of sedimentation. In this study, we use an ordinary angle rotor as a centrifugal accelerator, and experimentally compare the sedimentation ratio achieved by it with ratios obtained under gravity. The Stokes' viscosity model was used to discuss the differences between the two. We also found that the parameter that relates the viscosity of a solvent was several tens of times larger in the centrifugal acceleration condition than for the gravity condition. We also investigated the effect of the sedimentation in the mechanical properties of the MRFs. The yield stresses of a MRF are decreased by 30 % after the sedimentation.