Rheological analysis of magnetite added carbonyl iron based magnetorheological fluid

The addition of additives to soft-magnetic carbonyl iron (CI)-based magnetorheological (MR) suspensions is a popular method for solving the intrinsic sedimentation problem. In this study, synthesized magnetite nanoparticles were added to a CI suspension and its enhanced MR properties were investigated using a rotational rheometer. Based on an analysis of the variance, two models were introduced to assess the yield stress and shear viscosity in terms of the CI concentration, additive concentration, and magnetic field strength. The validation of the model was proven statistically through a supplementary experiment. The shear stress of the CI-based MR fluid versus the shear rate could be predicted properly using the proposed models. (C) 2017 Elsevier B.V. All rights reserved.