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SYNOPSISA high-shear mixer was used to mix a two-component system different only in the density, which was subjected to DEM (Discrete Element Method) simulation. In the first place, the kinetic motion of particles in an agitating vessel was visualized to obtain the information on how particles different in granular density were mixed and segregated. Then, segregation index was defined to clarify the relationship of segregation index and density ratio with operational conditions. The conditions were also clarified for obtaining favorable mixing conditions while segregation was prevented. In other words, it has been pointed out that DEM simulation could be not only employed to readily understand the mixing and segregation conditions of particles in a mixer but also effective in determining optimal operational conditions for obtaining favorable mixing conditions even when the density ratio is different.

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