Abstract
Mixing experiments with cohesionless and non-segregating powders have been carried out to evaluate the mixing performance of a rotary drum with simultaneous rocking motion. The temporal variation of the state of mixing was continuously measured by an optical method. It was found that the relatively low mixing rate attainable in horizontal rotating cylinders, in which diffusive mixing is the predominant mechanism, can be considerably enhanced by simultaneously rocking the mixer back and forth in the axial direction. The convective mixing promoted by the rocking motion is so effective that relatively high rocking speeds give very high mixing rates regardless of the value of the rotation speed.
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