No unified model is available yet to explain the dynamics of laser-induced cavitation bubbles during laser ablation of solid targets in liquids, when an extremely high capillary number is achieved (>100), i.e., when the viscous forces strongly contribute to the friction. By investigating laser-induced bubbles on gold and yttrium-iron-garnet targets as a function of the liquid viscosity, using a nanosecond laser and an ultrafast shadowgraph imaging setup, we give a deeper insight into what determines the bubble dynamics. We find that the competition between the viscous forces and the surface tension (capillary number Ca), on the one hand, and the competition between the viscous forces and inertia (Reynolds number Re), on the other hand, are both key factors. Increasing the viscous forces, and hereby Ca up to 100 has an impact on the bubble shape and results in a very pronounced rim, which separates the bubble in a spherical cap driven by inertia and an interlayer. The temporal evolution of the footprint radius of the interlayer can be addressed in the framework of the inertiocapillary regime. For an intermediate viscosity, the thickness of the interlayer is consistent with a boundary layer equation. Interestingly, our data cannot be interpreted with simplified hydrodynamic (Cox–Voinov) or molecular-kinetic theory models, highlighting the originality of the dynamics reported when extremely high capillary numbers are achieved. Upon bubble collapse, spherical persistent microbubbles are created and partly dispersed in water, whereas the high-viscous polyalphaolefines lead to long-standing oblate persistent bubbles sticking to the target’s surface, independent of the ablated target. Overall, liquid’s viscosity determines laser ablation-induced cavitation.
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31 January 2020
Research Article|
January 28 2020
Dynamics of laser-induced cavitation bubbles at a solid–liquid interface in high viscosity and high capillary number regimes
Tim Hupfeld
;
Tim Hupfeld
1
Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen
, Universitaetsstrasse 7, 45141 Essen, Germany
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Gaétan Laurens
;
Gaétan Laurens
2
Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière
, F-69622 Villeurbanne, France
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Samy Merabia
;
Samy Merabia
2
Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière
, F-69622 Villeurbanne, France
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Stephan Barcikowski
;
Stephan Barcikowski
1
Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen
, Universitaetsstrasse 7, 45141 Essen, Germany
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Bilal Gökce
;
Bilal Gökce
a)
1
Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen
, Universitaetsstrasse 7, 45141 Essen, Germany
a)Authors to whom correspondence should be addressed: bilal.goekce@uni-due.de and david.amans@univ-lyon1.fr
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David Amans
David Amans
a)
2
Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière
, F-69622 Villeurbanne, France
a)Authors to whom correspondence should be addressed: bilal.goekce@uni-due.de and david.amans@univ-lyon1.fr
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a)Authors to whom correspondence should be addressed: bilal.goekce@uni-due.de and david.amans@univ-lyon1.fr
J. Appl. Phys. 127, 044306 (2020)
Article history
Received:
June 24 2019
Accepted:
January 09 2020
Citation
Tim Hupfeld, Gaétan Laurens, Samy Merabia, Stephan Barcikowski, Bilal Gökce, David Amans; Dynamics of laser-induced cavitation bubbles at a solid–liquid interface in high viscosity and high capillary number regimes. J. Appl. Phys. 31 January 2020; 127 (4): 044306. https://doi.org/10.1063/1.5116111
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