Abstract
Abstract This experimental study presents the magnetoviscous effect of water based Mn-Zn Fe2O4 with C-TAB as surfactant under the influence of magnetic fields. Mn-Zn Fe2O4 magnetic nanoparticles have been synthesized and characterized using correspondingly co-precipitation method and XRD, SEM and VSM analysis. Effect of various parameters like flow shear rate (0.1–1000 1/s), nanoparticle volume concentration (0.0–0.6%), sample temperature (20–60 °C) and magnetic field (0–600 A/m), has been investigated. The results show that, for the cases without magnetic field, the viscosity behaves shear thinning, Newtonian and shear thickening at respectively low, moderate, and high shear rate values. With applying magnetic fields, the larger the field strength the larger the viscosity value. Also, with nanoparticle volume fraction augmentation as well as field increase, the two shear thinning and shear thickening behaviors have been augmented; Finally, an empirical correlation is proposed to predict magnetoviscous behavior of the ferrofluid as function of the various mentioned parameters. This correlation can be helpful in thermomagnetic convection investigations.
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