Main Page
About the Journal
Subscription information

Current Issue
Tables of Contents
Author Index


Sedimentation of particles in concentrated magnetic fluids: numerical simulation

A. F. Pshenichnikov - A. A. Kuznetsov

Institute of Continuous Media Mechanics, Ural Branch of RAS, 1 Acad.~Korolyov Str., 614013 Perm, Russia

Gravitational sedimentation of magnetic particles (dipolar hard spheres) is modelled by the means of Monte Carlo method and molecular dynamics. The main result of this simulation is the gradient diffusion coefficient of particles obtained as a function of the particle volume farction ϕ (ϕ ≤ 0.4) at low-to-intermediate coupling constants (1 ≤ λ ≤ 4). Based on numerical data it is shown that the applicability range of some previously used analytical models for the diffusion coefficient is mostly limited by λ ≅ 2. A new approximation formula for the diffusion coefficient is proposed. It quite accurately describes the obtained values up to λ = 4 and shows an excellent agreement with the known simulation data for the Helmholtz free energy of dipolar spheres. Figs 5, Refs 30.

Magnetohydrodynamics 51, No. 3, 551-560, 2015 [PDF, 0.22 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X