Detailed Jet Dynamics in a Collapsing Bubble

9th International Symposium on Cavitation

Supponen, Outi^1 ; Obreschkow, Danail^2 ; Kobel, Philippe^1 ; Farhat, Mohamed^1

Laboratory for Hydraulic Machines, Ecole Polytechnique Fédérale de Lausanne, Avenue de Cour 33bis, Lausanne

1007, Switzerland^1

International Centre for Radio Astronomy Research, University of Western Australia, M468 7 Fairway, Crawley

WA

6009, Australia^2

关键词: Cavitation bubble;    Collapse time;    Collapsing bubble;    Free surfaces;    High quality;    Jet dynamics;    Micro droplets;    Micro jet;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012038/pdf
DOI  :  10.1088/1742-6596/656/1/012038

来源: IOP

【 摘 要 】

We present detailed visualizations of the micro-jet forming inside an aspherically collapsing cavitation bubble near a free surface. The high-quality visualizations of large and strongly deformed bubbles disclose so far unseen features of the dynamics inside the bubble, such as a mushroom-like flattened jet-tip, crown formation and micro-droplets. We also find that jetting near a free surface reduces the collapse time relative to the Rayleigh time.