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Viscoelastic properties of magnetic fluids with fiber-like particles
M. T. Lopez-Lopez1 - A. Yu. Zubarev2 - D. Chirikov2, 3 - A. Radionov4
1 Departamento de Fisica Aplicada, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva, 18071 Granada, Spain
2 Urals Federal University, 51 Lenin Ave., 620083, Ekaterinburg, Russia
3 Ozyorsk Engineering Institute, Moscow Engineering Physical State University, Ozyorsk, Russia
4 Ferrogidrodinamika, Nikolayev, Ukraine
Abstract
The paper deals with theoretical study of the viscoelastic phenomena in magnetic suspensions of fiber-like ferromagnetic particles. Formation of the particles in bulk net-like aggregates strongly elongated along the applied magnetic field is considered. Contact friction between the particles in the aggregates affects the aggregate dynamics in a shear flowing suspension. Finite time of the aggregate orientation change after the change in shear rate gives rise to a macroscopic viscoelastic phenomena. Estimates show that the mechanism of the aggregates’ reorientation induces viscoelastic effects with a characteristic relaxation time of 0.1--1\,sec. Figs 2, Refs 17.