Birth and growth of cavitation bubbles within water under tension confined in a simple synthetic tree

Details Birth and growth of cavitation bubbles within water under tension confined in a simple synthetic tree Birth and growth of cavitation bubbles within water under tension confined in a simple synthetic tree

2011-05-20

arxiv.org/abs/1105.4104v3

Physics

Fluid Dynamics

Scientific paper

Water under tension, as can be found in several systems including tree vessels, is metastable. Cavitation can spontaneously occur, nucleating a bubble. We investigate the dynamics of spon- taneous or triggered cavitation inside water filled microcavities of a hydrogel. Results show that a stable bubble is created in only a microsecond timescale, after transient oscillations. Then, a diffusion driven expansion leads to filling of the cavity. Analysis reveals that the nucleation of a bubble releases a tension of several tens of MPa, and a simple model captures the different time scales of the expansion process.

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