Fast, thin jets from bubbles expanding and collapsing in extreme vicinity to a solid boundary: A numerical study

A bubble expanding and collapsing in water near a flat solid boundary is studied numerically. According to current knowledge, it develops a high-speed liquid jet towards the boundary of typically ∼100 m/s. However, the character of jet formation and the jet properties alter strongly when the bubble expands and collapses very close to a solid boundary. In this case, a much thinner and much faster jet of typically ∼1000 m/s is generated. The respective mechanism is demonstrated by solving the Navier-Stokes equations for a model of a laser-induced bubble. The results add substantially to the understanding of the erosion process caused by imploding cavitation bubbles near solid boundaries.Received 3 August 2018DOI:https://doi.org/10.1103/PhysRevFluids.4.021601©2019 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCavitationDrops & bubblesTechniquesNavier-Stokes equationFluid Dynamics