Conclusion

The drop breakup behavior was investigated through systematic experiments. The drop breakup time, breakup rate and the behavior of multiple breakage is discussed in this work. The definition of the breakup time is proposed as the time duration from the deformation of a spherical drop to the generation of the last fragment. The influences of the rotating speed, interfacial tension and the dispersed phase viscosity on the breakup time were analyzed. The experimental results indicated that the breakup time mainly depends on the interfacial tension and the drop diameter, slightly relies on the dispersed phased viscosity, while is almost independent of the rotating speed. An empirical correlation is proposed to predict the breakup time, and a good agreement was obtained between the predicted value and the experimental data in this study as well as in Solsvik and Jakobsen’s work34.
The maximum stable drop diameter d max is measured and shows a -0.6 power dependency of the impeller Weber number for the low viscous drop. For high viscous drop, the viscosity group is introduced to model the d max. The percentage of the binary breakup is analyzed to investigate the behavior of the multiple breakage. It is shown that the percentage of the binary breakup depends on the dimensionless diameter η = d /d max.
Finally, the breakup rate was experimental measured. it has shown a good concordance of the predicted values with the experimental ones, which further verified the accuracy and extensibility of the breakup model proposed in our previous study.