About One Mechanism of Controlling the Movement of Magnetic Particles by a Magnetic Field in a Nonuniformly Heated Liquid

A model of the transport of magnetic particles by a uniform magnetic field in a nonuniformly heated nonmagnetic liquid is proposed. The mechanism of transfer is based on taking into account the collective perturbation of the distribution of temperature and of the magnetic field strength by nonuniformly heated particles in the surrounding liquid. The change in the magnetic permeability of particles with temperature is taken into account. The interaction of particles leads to the appearance of a thermomagnetic force acting on particles in an external uniform magnetic field. The direction of movement of particles under the action of such a force depends on the mutual orientation of the vectors of the magnetic field strength and temperature gradient and can be either in the direction of an increasing or a decreasing temperature. The speed and magnitude of particle displacement in these cases are different, which means the anisotropy of the thermomagnetophoresis coefficient. The results obtained agree with the experimental data.