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Microemulsification from single laser-induced cavitation bubbles

Published online by Cambridge University Press:  14 December 2022

K Ashoke Raman Open the ORCID record for K Ashoke Raman [Opens in a new window] ,
Juan Manuel Rosselló Open the ORCID record for Juan Manuel Rosselló [Opens in a new window] ,
Hendrik Reese Open the ORCID record for Hendrik Reese [Opens in a new window]  and
Claus-Dieter Ohl Open the ORCID record for Claus-Dieter Ohl [Opens in a new window]
K Ashoke Raman*
Affiliation:
Department of Soft Matter, Institute of Physics, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Juan Manuel Rosselló
Affiliation:
Department of Soft Matter, Institute of Physics, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Hendrik Reese
Affiliation:
Department of Soft Matter, Institute of Physics, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Claus-Dieter Ohl
Affiliation:
Department of Soft Matter, Institute of Physics, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
*
†Email address for correspondence: ashokeraman@gmail.com
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Abstract

We study the interaction between a laser-induced cavitation bubble and a submillimetre-sized water droplet submerged in silicone oil. High-speed imaging reveals the pathways through which droplet fragmentation occurs and three distinct regimes of bubble–droplet interaction are identified: deformation, external emulsification and internal emulsification. We have observed that during the bubble collapse, the droplet elongates towards the bubble, which acts as a flow sink pulling on the droplet. For silicone oils with higher viscosity, the droplet jets into the cavitation bubble and forms a satellite water droplet in the continuous oil phase. In contrast, for lower-viscosity oils, the droplet encapsulates the collapsing bubble as it jets inside and undergoes multiple cycles of expansion and collapse. These internal bubble collapses create tiny oil droplets inside the parent water droplet. The kinematic viscosity of the silicone oil, maximum bubble diameter and centre-to-centre distance between the bubble and the droplet are varied. The regimes are separated in a parameter space set up by the non-dimensional distance and a cavitation Reynolds number.

JFM classification

Drops and Bubbles: Drops Drops and Bubbles: Breakup/coalescence Drops and Bubbles: Cavitation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 953 , 25 December 2022 , A27
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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