Cavitation-induced fragmentation of an acoustically-levitated droplet

9th International Symposium on Cavitation

Avila, Silvestre Roberto Gonzalez^1 ; Ohl, Claus-Dieter^1

Nanyang Technological University, School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, 21 Nanyang Link, Singapore

637371, Singapore^1

关键词: Acoustically levitated droplet;    Cavitation inception;    Complex Processes;    Equatorial planes;    Plasma generation;    Reflected waves;    Sequence of events;    Simulated results;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012017/pdf
DOI  :  10.1088/1742-6596/656/1/012017

来源: IOP

【 摘 要 】

In this paper we investigate the initial sequence of events that lead to the fragmentation of a millimetre sized water droplets when interacting with a focused ns-laser pulse. The experimental results show complex processes that result from the reflection of an initial shock wave from plasma generation with the soft boundary of the levitating droplet; furthermore, when the reflected waves from the walls of the droplet refocus they leave behind a trail of microbubbles that later act as cavitation inception regions. Numerical simulations of a shock wave impacting and reflecting from a soft boundary are also reported; the simulated results show that the lowest pressure inside the droplet occurs at the equatorial plane. The results of the numerical model display good agreement with the experimental results both in time and in space.