An expression is developed for the passage of material through rotaring cylindrical kilns or driers, relating the time of passage to the other important variables-slope, length, diameter., and rate of rotation of the kiln, feed rate and rill angle of the material. T h e expression is derived from fundamentals, and is in accord with previously published empirical relations. It is thought that the derivation will promote a better understanding of the mechanism of the movement of materials in rorary kilns and driers.
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