Bursting jet in two tandem bubbles at the free surface
Numerical simulations of the bubble-bursting phenomenon in two tandem bubbles at the free surface are conducted to explore the influence of a following bubble behind the bursting bubble on the jet ejection at fixed Bo = 0.05 and Oh = 0.022. The equivalent radius of the bursting bubble (RB) is fixed,...
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Veröffentlicht in: | Physics of fluids (1994) 2022-08, Vol.34 (8) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Numerical simulations of the bubble-bursting phenomenon in two tandem bubbles at the free
surface are conducted to explore the influence of a following bubble behind the bursting
bubble on the jet ejection at fixed Bo = 0.05 and Oh = 0.022. The equivalent radius of the bursting bubble (RB) is fixed, and the configuration of two tandem
bubbles is varied systematically by changing the equivalent radius of the following bubble
(RF) and the gap distance between the two
bubbles (L). An increase in the bubble–bubble interactive
force (repulsive force) is observed with a decrease in L or
an increase in RF. As the repulsive force
increases, the velocity of the primary capillary wave (PCW) increases due to the reduced
wavelength of the PCW, thus increasing the bursting jet velocity. However, when the
repulsive force is sufficiently large, the curvature of the PCW near the bottom of the
bursting bubble is reversed, causing a new secondary capillary wave to be generated. An
increase in the secondary capillary wavelength with an increase in the force disturbs the
self-similar behavior of the interface of the bursting bubble, resulting in a decrease in
the bursting jet velocity. In order to scale the bursting jet velocity using RF and L in cases where
PCWs are important to induce a bursting jet, a scaling law is formulated by defining the
scaling variable φ in terms of RF and L. The proposed scaling law
is found to be capable of providing accurate predictions of capillary numbers as a
function of φ. |
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ISSN: | 1070-6631 1089-7666 |
DOI: | 10.1063/5.0102792 |