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Gas injection plays an important role in bubble formation in microfluidics. The effects of the gas feed on the formation of N 2 bubbles in a microfluidic T-junction is highlighted under constant-pressure injection and constant-volumetric-flow-rate injection for gas. The effects of gas feed on characteristic parameters for bubble formation are studied, such as length l B, velocity u g, and frequency f of bubbles. The results indicate that the characteristic parameters increase with inlet gas–liquid flow rate ratio or pressure ratio. However, the parameters are more sensitive to the variation of inlet pressure ratio. The difference lies in the feedback effect of two-phase flow in downstream microchannels, which can be included in the relationship between the inlet pressure ratio and flow rate ratio. Finally, guidance for selecting gas feed method for gas–liquid two-phase flow in a microchannel is presented.
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Mi et al. (2019) studied this question.
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