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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v27.i2-4.80
pages 289-305

Dynamic Properties of Non-Dilute Magnetic Fluids

A. Yu. Zubarev
Ural State University, Ekaterinburg, Russia
A. V. Yushkov
Ural State University, Ekaterinburg, Russia

ABSTRACT

Functions of dynamic response to external magnetic field as well as rheological properties of moderately concentrated magnetic colloid consisting of identical spherical single-domain ferromagnetic particles have been derived by methods of statistical physics. Hydrodynamic and magnetodipole interactions between the particles were taken into account. The ferroparticle magnetic moment has been supposed to be constant in absolute value and to be frozen into the particle body. Our analysis has shown that the magnetodipole interaction increases both the functions of magnetic response and rheological parameters of the colloid as well as characteristic times of relaxation of both the colloid magnetization and hydrodynamic stress. We have studied some peculiarities of hydrodynamic behavior of the ferrocolloid in oscillating magnetic field. If the shear rate is large enough, the effective viscosity is nonmonotonic (with minimum) function of the field frequency w, the rotational effective viscosity is negative provided that this frequency is large enough. For the given w, the rotational viscosity is nonmonotonic function of the shear rate Ω. It is negative if Ω is small and positive if Ω. is large enough. The interparticle interaction increases the effective rotational viscosity in oscillating field.


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