Observational analysis identifies multiple flow regimes, indicating stability in viscous fluid interactions.
The present study investigates the flow dynamics of viscous fluid threads interacting with a less viscous fluid and their stability as they flow through a Hele-Shaw microfluidic cell. We study multiple liquid pairs and identify for the first time several flow regimes, including the well-known Kelvin-Helmholtz instability.
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Plopeanu et al. (2025) studied this question.
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