Effects of rotating magnetic field and temperature field on comminution of magnetic particles

This study examines the movement patterns and comminution of magnetic Ni particles in pure water in a flask. This flask is on top of an actuator which contains a rotating bar magnet, and is surrounded by circulating water at a constant temperature. A digital camera, a particle size analyzer and a field emission electron microscope were adopted to record the moving patterns, particle size distributions and micrographs of magnetic Ni particles. A thermocouple was employed to measure the temperature of pure water in the flask during Ni particle attrition. The effect of the temperature of the water that circulated around the periphery of the flask and the effect of the shape of the flask were analyzed. This study also investigated the effects of the water-to-particulate mass ratio and the placement of a bar magnet with an interface between the positive and negative poles in a bar magnet at an inclination angle on the shrinking and the moving pattern of the Ni particles.