Dynamics of a vapor nanobubble collapsing near a solid boundary

9th International Symposium on Cavitation

Magaletti, Francesco^1 ; Gallo, Mirko^1 ; Marino, Luca^1 ; Casciola, Carlo Massimo^1

Dipartimento di Ingegneria Meccanica e Aerospaziale, Università di Roma La Sapienza, via Eudossiana 18, Roma

00184, Italy^1

关键词: Bubble collapse;    Complex sequences;    Diffuse interface;    Interfacial flows;    Phase Change;    Shock wave emission;    Solid boundaries;    Topology modifications;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012012/pdf
DOI  :  10.1088/1742-6596/656/1/012012

来源: IOP

【 摘 要 】

In the present paper a diffuse interface approach [1] is used to address the collapse of a sub-micron vapor bubble near solid boundaries. This formulation enables an unprecedented description of interfacial flows that naturally takes into account topology modification and phase changes (both vapor/liquid and vapor/supercritical fluid transformations). Results from numerical simulations are exploited to discuss the complex sequence of events associated with the bubble collapse near a wall, encompassing shock-wave emissions in the liquid and reflections from the wall, their successive interaction with the expanding bubble, the ensuing asymmetry of the bubble and the eventual jetting phase.