Figure 6. The relationship between mass transfer flux and interfacial tension.

Droplet breakup behavior under mass transfer condition

Under mass transfer conditions two types of droplet breakage patterns, tensile breakup and revolving breakup, was observed as shown in Figure 7. This phenomenon is the same with that in our previous work without mass transfer 36. We can then conclude that the breakup pattern is little affected by mass transfer in the PDDC within our experimental conditions.
The fragment number of droplets is also a research contents in addition to the breakup patterns of droplets. As shown in Figure 8 (a), droplet breakup can be found at different heights from binary breakup to quintuple breakup under mass transfer conditions. Among these results, the binary breakup ratio occupies the main position. In the process of droplet breaking, the energy required for binary breaking is the lowest, so its breaking standard is easy to achieve. With the increase of the number of droplets produced by breaking, the energy required will increase.