Abstract
Two fractions of granular material mix in a drum rotating slowly about its longitudinal axis arranged horizontally. The drum is filled not to full capacity, and mixing occurs at each moment of time only on the free surface of material. It is shown that in a half-filled drum the material will never reach uniformly mixed state. Near this critical point, the inverse characteristic mixing time is proportional to δ2 ln(|δ|−1), where δ is the deviation from the half-fill level.
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