Figure 9. The proportion of binary breakage in different height
and different diameter of mother droplets under mass transfer
condition.
Daughter droplet size
distribution
The DDSD is also an important parameter in the process of droplet
breakup. It directly reflects the diameter of daughter droplets
generated after droplet breakup and also reveals whether the droplet
breaks equally or unevenly in the system. The multiple breakage is
treated as a series of binary breakage with the method reported in our
previous work 36. Figure 10 shows the experimental
results of DDSD at different height. The results show that the DDSD is
inverted U-shaped under mass transfer conditions. At the same time, the
size distribution of daughter droplets produced by breaking mother
droplets with different diameters is similar. The reason may be that
under mass transfer conditions, the droplet diameter in the experimental
system is relatively small and these droplets are more
prone to tensile breakage. The small
droplets produced in the process of tensile breakage tend to be equal in
diameter. Therefore, the DDSD shows an inverted U-shaped distribution.