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Most research efforts on mechanically agitated solid-liquid contactors have been devoted to the assessment of the minimum impeller speed for complete off-bottom suspension,  N   js  . Actually, many industrial vessels are operated at impeller speeds slightly lower than  N   js   (Oldshue, 1983; Rieger et al., 1988). This suggests that the  sufficient suspension  condition, which is quantitatively specified in this paper by introducing a suitably defined quantity  N   ss  , may represent a valid alternative to that of complete suspension.

CFD Predictions of Sufficient Suspension Conditions in Solid-Liquid Agitated Tanks