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Droplet merging in a diverging–converging section due to decompression. Sunset yellow and methylene blue solution are used as dispersed phases and silicone oil as a continuous phase. (a)–(e) represent mixing of equal droplets and (g)–(l) represent mixing of unequal droplets. The flow rate of the continuous phase is 5 and the dispersed phase flow rate is 1 . Images are captured at an interval of 180 ms.
