Eur. Phys. J. E (2004) 15: 271-276
https://doi.org/10.1140/epje/i2004-10067-3

New problems of particle transfer in ferrocolloids: Magnetic Soret effect and thermoosmosis

Institute of Physics, University of Latvia, Salaspils-1, LV-2169, Latvia

^* e-mail: eblums@sal.lv

Received: 27 July 2004
Accepted: 21 October 2004
Published online: 16 November 2004

Abstract

The paper deals with critical reviewing of the experiments on thermodiffusion in ferrocolloids. The observed magnetic Soret effect is much stronger than that predicted theoretically. It is shown that the main reason of that is the influence of the magnetic field on mass diffusion. Besides, some measurements are affected by uncontrolled thermal and solutal magnetic convection. In porous media, when macroscopic convection is suppressed, thermodiffusion is accompanied by thermoosmosis as well as by a microconvective mass transfer induced by particle magnetophoresis on filter grains.