Wednesday, February 22, 2012

1105.4104 (Olivier Vincent et al.)

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

Olivier Vincent, Philippe Marmottant, Pedro A. Quinto-Su, Claus-Dieter Ohl
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.
View original: http://arxiv.org/abs/1105.4104

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