Abstract
The main objective of this present paper is to measure the apparent viscosity of a magnetic suspension in the presence of particle agglomerates of different sizes for several applied magnetic fields, shear rates and particle volume fractions. A secondary goal is to investigate suspension microstructure transition, when subjected to a magnetic field. We show that an employed like virial expansion of two empirical coefficients based only on the experimental data gives a good quantitative description of the magnetorheological suspension effective viscosity up to particle volume fraction less than 0.01. The observed shear rate dependence viscosity is a direct consequence of the stretching, breaking particle structures of different sizes and shapes formed by the action of magnetic attractive force between the polarized particles as observed previously in the context of dense ferrofluids. We have identified even in the limit of a very small particle volume fraction a strong non-linear behavior of the examined suspension due to formation of suspended blobs-like aggregates of different sizes and anisotropic chains of particles. These structures are induced by the presence of an external magnetic field and particle–particle magnetic interactions. A histogram of the structure size distribution is also examined. The results of this paper are important to those who are interested on the magnetorheological suspensions.
Published Version
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