MINIMUM IMPELLER SPEEDS FOR COMPLETE DISPERSION OF NON-NEWTONIAN LIQUID LIQUID-SYSTEMS IN BAFFLED VESSELS

The minimum impeller speed needed to completely disperse a Newtonian fluid in a pseudoplastic continuous phase was accurately predicted by the Skelland and Ramsay correlation (eq 12). The overall absolute deviation was 8.9% for 120 runs when Vermeulen et al.'s viscosity expression was combined with Metzner and Otto's definition of apparent viscosity, μA, in place of μc. The variables included four pseudoplastic fluids with flow behavior indices between 0.52 and 0.83, three ø values (0.5, 0.33, 0.167), and four common impeller types in a baffled vessel. © 1990, American Chemical Society. All rights reserved.