Dynamics of laser-induced cavitation bubbles at a solid–liquid interface in high viscosity and high capillary number regimes - Archive ouverte HAL Access content directly
Journal Articles Journal of Applied Physics Year : 2020

Dynamics of laser-induced cavitation bubbles at a solid–liquid interface in high viscosity and high capillary number regimes

Abstract

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 result 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 molecularkinetic 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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Dates and versions

hal-03035284 , version 1 (05-12-2020)

Identifiers

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Tim Hupfeld, Gaétan Laurens, Samy Merabia, Stephan Barcikowski, Bilal Gökce, et al.. Dynamics of laser-induced cavitation bubbles at a solid–liquid interface in high viscosity and high capillary number regimes. Journal of Applied Physics, 2020, 127 (4), pp.044306. ⟨10.1063/1.5116111⟩. ⟨hal-03035284⟩
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