DYNAMICS OF THE LOCAL INHOMOGENEITIES OF THE SOLID-PHASE CONCENTRATION IN A FLUIDIZED-BED OF MAGNETIC PARTICLES

Unsteady problems of the motion and evolution of density inhomogeneiti es in a developed fluidized bed of ferromagnetic solid particles are c onsidered. The bed is subject to the action of a specified external ma gnetic field. The inhomogeneities are located in regions where the par ticle concentration differs from its mean value throughout the bed. Th e model of the inhomogeneity, proposed previously in [1-3], as a spher ical cluster of particles whose boundary is the surface of discontinui ty of the distribution of the solid-phase concentration is developed. Both the case of a varying density of the surface of discontinuity, im permeable to solid-phase particles (a constant-mass cluster), and the case of a discontinuity with inflow or outflow of dispersed particles are studied. The effect of the external magnetic field and magnetic pr operties of the particles on the velocity of motion of inhomogeneities through the bed, their steady-state sizes and lifetimes is evaluated.