Spatial distributions of media kinetic energy as measured by positron emission particle tracking in a vertically stirred media mill

The impeller speed was found to significantly affect media KE distribution in the mill. At higher tip speeds the media particle has lower energy outside the impeller zone compared to in the impeller zone indicating that there is significantly less energy transfer between the zones when the tip speed is increased. Additionally, at high tip speeds the occupancy is low in the high kinetic energy region at the impellers.