Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X32: Dynamics and Rupture I
8:00 AM–10:23 AM,
Tuesday, November 21, 2023
Room: 158AB
Chair: Angel Rodriguez, United States Naval Academy
Abstract: X32.00006 : Acoustic cavitation, bubble jetting and surface instabilities in a free-falling droplet*
9:05 AM–9:18 AM
Presenter:
Juan Manuel M Rosselló
(Faculty of Mechanical Engineering, University of Ljubljana.)
Authors:
Juan Manuel M Rosselló
(Faculty of Mechanical Engineering, University of Ljubljana.)
Hendrik Reese
(Otto-von-Guericke-University Magdeburg.)
K. Ashoke Raman
(Otto von Guericke University Magdeburg.)
Claus-Dieter Ohl
(Otto-von-Guericke University Magdeburg.)
High-speed recordings of droplet/bubble dynamics are combined with velocity and pressure field simulations under the same initial conditions. The impact of the curved free surface of the drop on the bubble jetting dynamics is qualitatively assessed by classifying cavitation events using a non-dimensional stand-off parameter dependent on the drop size, bubble maximum radius, and relative bubble position inside the droplet. Furthermore, the role of the curvature of the surface is examined through a structural similarity algorithm, comparing bubbles produced near a flat surface to those within the droplet. Remarkably, this quantitative comparison reveals equivalent stand-off distances where bubbles influenced by different boundaries behave similarly. The oscillation of laser-induced bubbles promotes the onset of Rayleigh-Taylor and Rayleigh-Plateau instabilities on the droplet's surface. These are studied by varying the ratio of the maximum radii of the bubble and the drop. Here, specific mechanisms leading to droplet surface destabilization are identified through a detailed analysis of high-speed images and numerical simulations.
*This project has received funding from the European Union's Horizon research and innovation programme under the Marie Skłodowska-Curie grant agreement No.,101064097, as well as the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under contract OH75/4-1 and INST 272/280-1.
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