Rheological Characteristics of Viscoelastic Magnetic Fluid

Abstract

Viscoelastic magnetic fluid (VMF) is a kind of a smart and functional fluid in which magnetic nano particles are uniformly suspend. The rheological behavior of VMF is investigated, in the present study, in view of effects from magnetic property in the fluid. The dynamic rheological properties of VMF in externally applied uniform magnetic fields are measured by a laboratory-made cone-plate rheometer. In particular, the effects of the magnetic field on the viscoelastic properties (the complex dynamic modulus; storage modulus G′ and loss modulus G″ ) of VMF are studied. In order to verify the gains from experimental investigation, a theoretical analysis is also presented in the present study. Experimental results indicates that the viscosity and elasticity of VMF are significantly influenced by both applied magnetic field and concentrations of the magnetic particles. Theoretical analysis qualitatively explains the findings from the experiments, indicating that VMF has dominant characteristic related to the concentration of magnetic particles associated with their network formation in the applied magnetic field.