A new droplet breakage criterion and a modified model of droplet breakage frequency which account for the effect of dispersed phase viscosity on drop deformation and breakage were presented.By the stochastic approach of Monte Carlo simulation the drop size distribution and Sauter mean diameter d32 in turbulent agitated liquid-liquid dispersions were obtained.The calculated results showed that predicted values of d32 were in better agreement with the experimental ones reported in literature

so the modified droplet breakage frequency model is superior to that proposed by Coulaloglou and Tavlarides in the case of viscous dispersed phases.The calculated results also showed that for viscous dispersed phases the viscosity of dispersed phase would restrict droplet deformation and drop breakage frequency would be decreased considerably.Consequently drop sizes would increase obviously and drop size distributions would also be shifted to the right.