Figure 11 The percentage of the binary breakup. (a) versus drop diameter; (b) versus dimensionless diameter (d/dmax) and compare with the experimental result in a pulsed disc and doughnut column 44.

Breakup rate

The drop breakup rate was determined experimentally based on Equation 1. Figure 12 shows the results of the drop breakup rate using the drop diameter as the abscissa. It can be seen from Figure 12a-c that breakup rate monotonously increases with increasing drop diameter. Moreover, Figure 12a,b indicated that the breakup rate gets larger for the larger rotating speed and lower interfacial tension. The reason is that increasing the rotating speed can strengthen the disruptive stress, as is shown in Equation 4,5, which leads to an increase in the drop breakup possibility. Besides, it is illustrated in Section 4.1 that the breakup time is almost independent of the rotating speed, making the breakup rate monotonously increases with the increase of rotating speeds. For the lower interfacial tension and larger drop diameter, the interfacial stress σ I = 6σ /d of a drop is smaller, leading to the weaker ability to maintain drops without deforming. Thus, the breakup rate is larger for the smaller interfacial stress. Figure 12c shows the combined influences of interfacial tension and dispersed phase viscosity. As the interfacial tension is little different for the System No.1 and 5, the big distinction of the breakup rate is attributed to the different dispersed phase viscosity.