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- W2337662983 abstract "Cavitation bubbles collapsing in the vicinity to a solid substrate induce intense micro-convection at the solid. Here we study the transient near-wall flows generated by single collapsing bubbles by chronoamperometric measurements synchronously coupled with high-speed imaging. The individual bubbles are created at confined positions by a focused laser pulse. They reach a maximum expansion radius of approximately 425μm. Several stand-off distances to the flat solid boundary are investigated and all distances are chosen sufficiently large that no gas phase of the expanding and collapsing bubble touches the solid directly. With a microelectrode embedded into the substrate, the time-resolved perturbations in the liquid shear layer are probed by means of a chronoamperometric technique. The measurements of electric current are synchronized with high-speed imaging of the bubble dynamics. The perturbations of the near-wall layer are found to result mainly from ring vortices created by the jetting bubble. Other bubble induced flows, such as the jet and flows following the radial bubble oscillations are perceptible with this technique, but show a minor influence at the stand-off distances investigated." @default.
- W2337662983 created "2016-06-24" @default.
- W2337662983 creator A5001997980 @default.
- W2337662983 creator A5003622144 @default.
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- W2337662983 date "2016-11-01" @default.
- W2337662983 modified "2023-10-14" @default.
- W2337662983 title "Vortex dynamics of collapsing bubbles: Impact on the boundary layer measured by chronoamperometry" @default.
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- W2337662983 doi "https://doi.org/10.1016/j.ultsonch.2016.04.023" @default.
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