We discuss the interaction of the strongly nonlinear fluid motion induced by the collapse of a vapor microbubble over a planar surface and the elastic dynamics of the underlying solid. The fluid is described using an extension of the Navier-Stokes equations endowed with distributed capillary stresses in the context of a diffuse interface approach. The collapse of the bubble is triggered by overpressure in the liquid and leads to an intense jet that pierces the bubble, changing the bubble topology from spheroidal to toroidal, and impinges the solid wall inducing an intense and strongly localized load. Moreover, at bubble collapse, a compression wave is launched into the liquid surrounding the bubble. By propagating along the solid surface, the compression wave combined with the liquid jet excites the dynamics of the elastic solid, producing a complex system of waves, including, longitudinal, transversal, and Rayleigh waves, propagating in the solid. It is conjectured that the intense deformation of the solid induced by the strongly localized liquid jet may lead to the plastic deformation of the solid producing the surface pitting observed in many applications subject to cavitation induced material damage.

Cavitation over solid surfaces: microbubble collapse, shock waves, and elastic response / Abbondanza, Dario; Gallo, Mirko; Casciola, Carlo Massimo. - In: MECCANICA. - ISSN 0025-6455. - (2022). [10.1007/s11012-022-01606-5]

Cavitation over solid surfaces: microbubble collapse, shock waves, and elastic response

Dario Abbondanza;Mirko Gallo;Carlo Massimo Casciola
2022

Abstract

We discuss the interaction of the strongly nonlinear fluid motion induced by the collapse of a vapor microbubble over a planar surface and the elastic dynamics of the underlying solid. The fluid is described using an extension of the Navier-Stokes equations endowed with distributed capillary stresses in the context of a diffuse interface approach. The collapse of the bubble is triggered by overpressure in the liquid and leads to an intense jet that pierces the bubble, changing the bubble topology from spheroidal to toroidal, and impinges the solid wall inducing an intense and strongly localized load. Moreover, at bubble collapse, a compression wave is launched into the liquid surrounding the bubble. By propagating along the solid surface, the compression wave combined with the liquid jet excites the dynamics of the elastic solid, producing a complex system of waves, including, longitudinal, transversal, and Rayleigh waves, propagating in the solid. It is conjectured that the intense deformation of the solid induced by the strongly localized liquid jet may lead to the plastic deformation of the solid producing the surface pitting observed in many applications subject to cavitation induced material damage.
2022
cavitation; phase field method; bubble dynamics; elastic waves
01 Pubblicazione su rivista::01a Articolo in rivista
Cavitation over solid surfaces: microbubble collapse, shock waves, and elastic response / Abbondanza, Dario; Gallo, Mirko; Casciola, Carlo Massimo. - In: MECCANICA. - ISSN 0025-6455. - (2022). [10.1007/s11012-022-01606-5]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1659666
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