Abstract
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.
Highlights
The collapse of vapor bubbles near solid boundaries started being investigated in the last century, motivated by the destructive effects of cavitation on ship propellers and hydraulic turbines and pumps and is still today receiving an increasingly significant attention [2, 3, 4]
In the present paper a diffuse interface approach [1] is used to address the collapse of a sub-micron vapor bubble near solid boundaries
Cavitation is exploited in medicine, e.g. in high intensity focused ultrasound (HIFU) and extracorporeal shock wave lithotripsy (ESWL) [7] to enhance drug delivery or localized heat deposition deep within the body, and to induce cell membrane poration [8] or to comminute kidney stones [9]
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. 2015 J. Dipartimento di Ingegneria Meccanica e Aerospaziale, Universitadi Roma “La Sapienza”, via Eudossiana 18, 00184 Roma Italy
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