DOI: 10.1615/ICHMT.1997.IntSymLiqTwoPhaseFlowTranspPhen
ISBN Print: 1-56700-162-9
EFFECT OF NON-NEWTONIAN FLOW BEHAVIORS ON SHEAR STRESS IN LIQUID-LIQUID DISPERSION
SINOPSIS
The influence of non-Newtonian flow behaviors of the continuous phase on drop break-up and shear stress acting on the drop was discussed. Drop sizes and drop size distributions were measured in agitated non-Newtonian fluids using a 0.09 m diameter mechanically stirred tank. Aqueous solutions of carboxymethyl cellulose and xanthan gum representing non-Newtonian flow behaviors were used as the continuous phase. It was experimentally found that the non-Newtonian characteristics cause the increase in the maximum drop size particularly at low impeller speeds and lead to widening of the drop size distribution. The boundary layer shear force model for liquid-liquid dispersion in stirred tank reactors was developed for pseudoplastic non-Newtonian fluid systems. It was found that the experimental data correspond to the boundary layer shear force model. The characteristic shear stress responsible for liquid-liquid dispersion in stirred tank reactors may be able to be estimated using the proposed model.