Figure 7. The main droplet breakup patterns (a) Tensile breakup. (b) Revolving breakup.
We can further see from Figure 8 (a) that, at the height of 265 mm, the proportion of binary breakage is the lowest, while that of multiple breakage is the highest. According to the calculation results, the reason may be that the interfacial tension at this location is small and the energy required for droplet breakup in small interfacial tension system is less. In the same turbulent flow field, multiple breakup is more likely to occur, which results in the lowest proportion of binary breakup of droplets at the height of 265 mm. The influencing trend of DIFT on the ratio of different number of breakage is the same with that of different values of static interfacial tension presented in our previous work 37. This proves that the DIFT in this work is a proper defined parameter characterizing the effect of mass transfer.