Abstract
BackgroundDroplet coalescence in rectangular microchannel is universally applied in microchemical process, however, the effect of aspect ratio on interfacial evolution and dynamics of coalesced droplets has not yet been elucidated. MethodsProcess of coalescence in microchannels with different aspect ratios was recorded by visualization technology, and the interfacial evolution of liquid bridge was investigated experimentally. FindingsThe evolution of neck width could be divided into two stages: dispersed phase controlling stage and continuous phase controlling stage, and the neck evolution conforms to power law in the both two stages. However, the exponents in the two stages are different under various flow rate ratios of two phases and aspect ratios of rectangular microchannels. There exists a turning point between the two stages. The neck width at turning point increases linearly with the two-phase flow rate ratio, and the arrival time of turning point decreases exponentially with the increase of flow rate ratio.
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