FIG. 5.

Transition of the droplet regime from squeezing (a)–(f) to dripping (g)–(l) in a microfluidic T-junction. Distilled water, methylene blue, and sunset yellow solutions are used as dispersed phases and silicone oil as a continuous phase. The flow rate of the continuous phase is 6 $\mu \mathrm{l}/\min$, and the dispersed phase flow rate is 2 $\mu \mathrm{l}/\min$ for (a)–(f) ($Ca=0.0175$). The flow rate of the continuous phase is 10 $\mu \mathrm{l}/\min$, and the dispersed phase flow rate is 2 $\mu \mathrm{l}/\min$ for (g)–(l) ($Ca=0.0292$). Images are captured at an interval of 180 ms for (a)–(f) and 220 ms for (g)–(l).