Minimum impeller speeds for complete dispersion of non-Newtonian liquid-liquid systems in baffled vessels

Abstract

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. 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, μ A , in place of μ C . The variables included four pseudoplastic fluids with flow behavior indices between 0.52 and 0.83, three Φ values (0.5, 0.33, 0.167), and four common impeller types in a baffled vessel