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Fluid mixing in microfluidic systems is of great interest in nowadays chemical engineering.Since the flows in simple microchannels are predominantly laminar and uniaxial,molecular diffusion generally becomes the major driving force for the mixing of fluid streams.Considering the low diffusion capability,mixing process is still not fast enough even at the micro-scale of~100 mm in most cases.As an alternative,droplet-based microfluidic system has become one of the promising solutions,which takes advantage of fluid recirculation both inside and outside droplets to increase the convective mass transfer between streams.