76th Annual Meeting of the APS Division of Fluid Dynamics (November 19, 2023 — November 21, 2023)

P0044: A Race of Clean Bubble vs Contaminated Trouble

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Authors

• Palas Kumar Farsoiya, Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
• Stéphane Popinet, Institut Jean Le Rond d’Alembert, CNRS UMR 7190, Sorbonne Université, Paris 75005, France
• Howard Stone, Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
• Luc Deike, Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA

DOI: https://doi.org/10.1103/APS.DFD.2023.GFM.P0044

Interfacial tension between two immiscible fluids can be modified because of the presence of surfactants. The rise velocity of bubbles is reduced in presence of surfactants because of a surface tension gradient created as surfactants are swept to the rear of the bubble. The figures show the interface of a rising bubble and surfactant concentration (high to low: red - white -blue) produced by Direct Numerical Simulation (Basilisk, http://basilisk.fr) .