Abstract
Spontaneous liquid-liquid slug (bislug) flow in microchannels has been observed for both circular and square cross sections. Flow is induced via an imbalance in interfacial tensions and curvatures between the two gas-liquid surfaces and the liquid-liquid surface. Bislug flow in square cross-section microchannels is generally much quicker than bislug flow in circular capillaries for a variety of reasons; including the self-wetting nature of the microchannel and the decrease in viscous resistance in the corners.
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