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.