Abstract
Tridimensional Magnetic Resonance Imaging (MRI) was used to study the mixing and segregation processes in a Turbula mixer using binary mixtures of sugar beads. A segregation index S was defined to study the homogeneity and the kinetics of the mixing/segregation processes. When the ratio of bead diameters dmax/dmin is approximately 1, the mixing process is observed, but segregation occurs as soon as dmax/dmin is greater than 1.1. Moreover, the segregation appears as a faster process than mixing in the Turbula blender.