Abstract
ABSTRACT A review is made of the methods and theory of measurements of residence time distributions (RTD's) in mills. Literature data on RTD's is assembled. The mean residence times indicate that some industrial mills are operated in the over–filled condition, leading to poor breakage conditions. Although all RTD's are somewhat similar on a dimensionless basis, there appears to be no consistent pattern to explain differences from one mill to another. The general form of measured RTD's Ms consistent with an axial convective–raixing model, but this model does not explain why the Peclet number is independent of mill length–to–diameter ratio and mass throughput. It is concluded that substantial work remains to be done before an adequate understanding of ball mill RTD's is obtained.
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