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Damage Potential of the Shock-Induced Collapse of a Gas Bubble

Johnsen, Eric and Colonius, Tim and Cleveland, Robin (2011) Damage Potential of the Shock-Induced Collapse of a Gas Bubble. In: Proceedings of the 7th International Symposium on Cavitation (CAV2009). Vol.1. Curran , Red Hook, NY, pp. 473-482. ISBN 9781617826429.

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Numerical simulations are used to evaluate the damage potential of the shock-induced collapse of a pre-existing gas bubble near a rigid surface. In the context of shock wave lithotripsy, a medical procedure where focused shock waves are used to pulverize kidney stones, shock-induced bubble collapse represents a potential mechanism by which the shock energy directed at the stone may be amplified and concentrated. First the bubble dynamics of shock-induced collapse are discussed. As an indication of the damage potential, the wall pressure is considered. It is found that, for bubbles initially close to the wall, local pressures greater than 1 GPa are achieved. For larger stand-off distances, the wall pressure is inversely proportional to the location of bubble collapse. From this relationship, it is found that bubbles within a certain initial stand-off distance from the wall amplify the pressure of the incoming shock. Furthermore, the extent along the wall over which the pressure due to bubble collapse is higher than that of the pulse is estimated. In addition, the present computational fluid dynamics simulations are used as input into an elastic waves propagation code, in order to investigate the stresses generated within kidney stone in the context of shock wave lithotripsy. The present work shows that the shock-induced collapse of a gas bubble has potential not only for erosion along the stone surface, but also for structural damage within the stone due to internal wave reflection and interference.

Item Type:Book Section
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2009 ASME The American Society of Mechanical Engineers. The authors gratefully acknowledge helpful discussions with members of the Consortium for Shock Waves in Medicine. The present work was supported by by NIH Grant PO1 DK043881 (Andrew Evan PI) and ONR Grant N00014-06-1-0730.
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NIHPO1 DK043881
Office of Naval Research (ONR)N00014-06-1-0730
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Record Number:CaltechAUTHORS:20190717-102318132
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97194
Deposited By: Melissa Ray
Deposited On:18 Jul 2019 16:44
Last Modified:03 Oct 2019 21:29

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