Abstract
Forced drainage has been widely used to study foam drainage regimes. Correct and accurate drainage regime of two phase foam is the base for better understanding the complicated three-phase froth. However, anomalies in data were uncovered in the presence of foam instability. Movement of bubbles in different foam instability conditions was firstly studied. Then, it was discussed that how the foam instability affected the power law relationship and the drainage regime. The power law index increased with the wider fitting range of liquid superficial velocity. Finally, the factors influencing foam instability and the power law relationship were analysed, including the position of imposed liquid, bubble size, and foam drying time. This paper advances our understanding of forced drainage in terms of foam instability.
Published Version
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