Dynamics of an initially spherical bubble rising in quiescent liquid

Manoj Kumar Tripathi, Kirti Chandra Sahu () and Rama Govindarajan
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Manoj Kumar Tripathi: Indian Institute of Technology Hyderabad
Kirti Chandra Sahu: Indian Institute of Technology Hyderabad
Rama Govindarajan: TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract The beauty and complexity of the shapes and dynamics of bubbles rising in liquid have fascinated scientists for centuries. Here we perform simulations on an initially spherical bubble starting from rest. We report that the dynamics is fully three-dimensional, and provide a broad canvas of behaviour patterns. Our phase plot in the Galilei–Eötvös plane shows five distinct regimes with sharply defined boundaries. Two symmetry-loss regimes are found: one with minor asymmetry restricted to a flapping skirt; and another with marked shape evolution. A perfect correlation between large shape asymmetry and path instability is established. In regimes corresponding to peripheral breakup and toroid formation, the dynamics is unsteady. A new kind of breakup, into a bulb-shaped bubble and a few satellite drops is found at low Morton numbers. The findings are of fundamental and practical relevance. It is hoped that experimenters will be motivated to check our predictions.

Date: 2015
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DOI: 10.1038/ncomms7268

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