Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session G10: Bubbles: Nucleation and Coalescence
10:35 AM–12:32 PM,
Monday, November 19, 2018
Georgia World Congress Center Room: B215
Chair: Olivier Coutier-Delgosha, Virginia Polytechnic Institute
Abstract ID: BAPS.2018.DFD.G10.4
Abstract: G10.00004 : Investigation of the Primary Mechanisms of Cavitation-Induced Damages*
11:14 AM–11:27 AM
(Virginia Tech, Arts et Metiers ParisTech)
Erosion of solid surfaces due to cavitation has been studied for decades. However, it has been a long debate that which mechanism, namely shockwaves, microjets towards the surface, or both, during the cavitation bubble collapse is the primary factor responsible for that erosion. In this project we investigate the small-scale mechanisms of material erosion induced by the collapse of a single cavitation bubble close to a wall. More specifically, our experimental setup includes modification of the initial nucleus size, the maximum bubble radius, the stand-off distance to the wall, the material softness, and the initial flow temperature. We record the evolution of the bubble using high speed cameras as well as the local impacts on the materials. With the help of specifically designed cold-wires, we also measure the temperature in the liquid and in the bubble. Two different methods are used to generate the bubble: (i) an acoustic shockwave of variable intensity, (ii) a YAG laser, which may introduce a high temperature at the start. Some first results will be presented at the conference.
*This work is conducted in the scope of the NSF project 1706003. The authors express their gratitude to Ron Joslin, Program manager of the Fluid Dynamics program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G10.4
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