Abstract
Magneto-rheological properties of a magnetic particle suspension are strongly dependent on the formation of aggregates of magnetic particles. A suspension of ferromagnetic rod-like particles can be expected to exhibit strong magneto-rheological characteristics, which is a significantly important factor for application of magnetic particle suspensions to mechanical dampers and actuators. Hence, in the present study, we focus on a ferromagnetic rod-like particle suspension to discuss the magneto-rheological properties. The results were obtained by means of Brownian dynamics simulations in a simple shear flow situation. In a weak applied magnetic field, magnetic rod-like particles tend to aggregate to form raft-like clusters, and with increasing magnetic field strength, these raft-like clusters drastically dissociate into single-moving particles at a certain value of the magnetic field strength. The net viscosity and its viscosity components exhibit complex dependence on the magnetic field strength, which is mainly due to the raft-like cluster formation of magnetic particles.
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