Magnetophoresis, sedimentation, and diffusion of particles in concentrated magnetic fluids / Pshenichnikov A.F., Elfimova E.A., Ivanov A.O. // Journal of Chemical Physics. - 2011. - V. 134, l. 18.

ISSN:

00219606

Type:

Article

Abstract:

A dynamic mass transfer equation for describing magnetophoresis, sedimentation, and gradient diffusion of colloidal particles in concentrated magnetic fluids has been derived. This equation takes into account steric, magnetodipole, and hydrodynamic interparticle interactions. Steric interactions have been investigated using the Carnahan-Starling approximation for a hard-sphere system. In order to study the effective interparticle attraction, the free energy of the dipolar hard-sphere system is represented as a virial expansion with accuracy to the terms quadratic in particle concentration. The virial expansion gives an interpolation formula that fits well the results of computer simulation in a wide range of particle concentrations and interparticle interaction energies. The diffusion coefficient of colloidal particles is written with regard to steric, magnetodipole and hydrodynamic interactions. We thereby laid the foundation for the formulation of boundary-value problems and for calculation of concentration and magnetic fields in the devices (for example, magnetic fluid seals and acceleration sensors), which use a concentrated magnetic fluid as a working fluid. The Monte-Carlo methods and the analytical approach are employed to study the magnetic fluid stratification generated by the gravitational field in a cylinder of finite height. The coefficient of concentration stratification of the magnetic fluid is calculated in relation to the average concentration of particles and the dipolar coupling constant. It is shown that the effective particle attraction causes a many-fold increase in the concentration inhomogeneity of the fluid if the average volume fraction of particles does not exceed 30%. At high volume concentrations steric interactions play a crucial role. © 2011 American Institute of Physics.

Author keywords:

Index keywords:

Acceleration sensors; Analytical approach; Average concentration; Colloidal particle; Dipolar couplings; Fluid stratification; Gravitational fields; Hard-sphere system; High volume concentration; Hydr

DOI:

10.1063/1.3586806

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84855449762&doi=10.1063%2f1.3586806&partnerID=40&md5=2c815f49ccb78b63f50b97909874fdf6

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Поле	Значение
Art. No.	184508
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84855449762&doi=10.1063%2f1.3586806&partnerID=40&md5=2c815f49ccb78b63f50b97909874fdf6
Affiliations	Institute of Continuous Media Mechanics UB RAS, 1, Korolyov St., 614013, Perm, Russian Federation; Ural State University, 51, Lenin Ave., 620083, Ekaterinburg, Russian Federation
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Correspondence Address	Elfimova, E.A.; Ural State University, 51, Lenin Ave., 620083, Ekaterinburg, Russian Federation; email: Ekaterina.Elfimova@usu.ru
CODEN	JCPSA
Language of Original Document	English
Abbreviated Source Title	J Chem Phys
Source	Scopus