75th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2022 — November 22, 2022)

V0108: Raindrops within bubbles

  • Davide Bernardo Preso, Ecole Polytechnique Federale de Lausanne
  • Armand Baptiste Sieber, Ecole Polytechnique Federale de Lausanne
  • Mohamed Farhat, Ecole Polytechnique Federale de Lausanne
DOI: https://doi.org/10.1103/APS.DFD.2022.GFM.V0108

This video illustrates peculiar phenomena observed during the growth and collapse of a laser-induced cavitation bubble near a tissue mimicking agarose hydrogel. It reveals how the bubble interacts strongly with the hydrogel and takes on a mushroom shape, the cap of which collapses and sets out a spurt of liquid (rainy-jet) with an unprecedented speed of the order of 2000 m/s.

The video also displays the influence of the hydrogel composition on several bubble dynamics key parameters, i.e. bubble volume, collapse time, rebound size, and micro-jet speed.

These results contrast with the case of a cavitation bubble collapsing onto a solid surface, where the dynamics of the bubble result to be much different.


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