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.