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Passive droplet merging realized by design of the channel geometry. (a) and (b) show the merging of two or more droplets. Reprinted from [91,92] with permission from Springer; (c) and (d) demonstrate last moment of droplet merging, called decompression merging. Reprinted from [93] with permission from the American Physical Society (APS). Note: the arrows indicate the traveling direction of the droplets.
