We study experimentally the formation and dynamics of large bubbles in a bubbling configuration.1 A constant airflow rate is injected in a viscous liquid from a submerged nozzle. At low airflow rates, bubbles rise independently and recover a quasi-spherical shape. Conversely, at sufficiently high flow rates, pairs of bubbles start to interact as shown in Fig. 1. There, the wake of the leading bubble sucks the trailing one and strongly deforms it. The non-equilibrium dynamics of this elongated bubble exhibits an intense and concentrated jet developing right after detachment. For even larger flow rates, this jet is so violent that perforation of the bubble and of the free surface may occur, resulting in liquid eruptions as shown in Fig. 2.
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Miscellaneous| September 30 2011
Jets in viscous bubbles
T. Séon, A. Antkowiak; Jets in viscous bubbles. Physics of Fluids 1 September 2011; 23 (9): 091103. https://doi.org/10.1063/1.3640015
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