Abstract
In previous work an analysis of the primary flow and secondary circulation on a spiral was developed and an approximate model was derived for the free motion of particles within the slurry. The main features of the fluid and particle motion were subsequently investigated experimentally and found to be in reasonable agreement with predictions based on free motion on a spiral trough. The theoretical basis is briefly reviewed and the current limitations of the model are discussed. The extensions to the theory needed to include an external rotation are then introduced and the results of a range of simulations for both coal and heavy mineral spirals are presented.
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