Structure formation of ferrocolloids in a rotating magnetic field

A. Yu. Zubarev

Abstract
A model of domain formation with an increased concentration of ferromagnetic particles in a rotating magnetic field has been proposed. The domains are considered as circular cylinders with their axes perpendicular to the plane of field rotation. The force of phase interaction has been assumed to be the cause of their formation, while this force is perpendicular to the retalive motion velocity of the particles and the liquid surrounding them, attracting the particles towards the region with increased concentrations. Under stable conditions, the above flow of particles is balanced by a heat flow of particles «evaporating» from the aggregate. The conditions which allow to calculate the domain radius, the particle concentration within it and its rotational velocity depending on physical properties of the colloid as well as on the frequency and intensity of the magnetic field are given. Fig 1, refs 23.