Issue
EPL
Volume 85, Number 1, January 2009
Article Number 14002
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/85/14002
Published online 07 January 2009
EPL, 85 (2009) 14002
DOI: 10.1209/0295-5075/85/14002

Effect of the strong magnetic field on the magnetic interaction between two non-magnetic particles migrating in a conductive fluid

Z. Sun1, T. Kokalj1, M. Guo1, F. Verhaeghe1, O. Van der Biest1, B. Blanpain1 and K. Van Reusel2

1   Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven Kasteelpark Arenberg 44, BE-3001 Heverlee (Leuven), Belgium, EU
2   Department of Electrical Engineering, Katholieke Universiteit Leuven Kasteelpark Arenberg 10, BE-3001 Heverlee (Leuven), Belgium, EU

zhisun@126.com

received 23 September 2008; accepted in final form 1 December 2008; published January 2009
published online 7 January 2009

Abstract
This paper presents a theoretical analysis of the interaction between two non-magnetic particles migrating in a conductive fluid due to an imposed strong magnetic field. A repulsive force induced by the conductive fluid flow around the particles is first derived and calculated for a concrete example. From the numerical results, a counteracting behavior with the interparticle magnetic dipole-dipole attractive force is found to exist at a critical particle size which makes the particles controllable under strong magnetic fields (e.g., B > 10 T). This renders a better understanding of recent experimental results and provides a basis to control the particle size distribution using strong magnetic fields for materials processing.

PACS
47.65.Cb - Magnetic fluids and ferrofluids.
75.47.-m - Magnetotransport phenomena; materials for magnetotransport.

© EPLA 2009