Nucleation threshold and deactivation mechanisms of nanoscopic cavitation nuclei

Details Nucleation threshold and deactivation mechanisms of nanoscopic cavitation nuclei Nucleation threshold and deactivation mechanisms of nanoscopic cavitation nuclei

2009-06-02

arxiv.org/abs/0906.0556v1

Phys. Fluids 21, 102003 (2009)

Physics

Fluid Dynamics

9 pages, 12 figures

Scientific paper

10.1063/1.3249602

The acoustic nucleation threshold for bubbles trapped in cavities has theoretically been predicted within the crevice theory by Atchley & Prosperetti [J. Acoust. Soc. Am. 86, 1065-1084 (1989)]. Here, we determine this threshold experimentally, by applying a single pressure pulse to bubbles trapped in cylindrical nanoscopic pits ("artificial crevices") with radii down to 50 nm. By decreasing the minimum pressure stepwise, we observe the threshold for which the bubbles start to nucleate. The experimental results are quantitatively in excellent agreement with the theoretical predictions of Atchley & Prosperetti. In addition, we provide the mechanism which explains the deactivation of cavitation nuclei: gas diffusion together with an aspherical bubble collapse. Finally, we present superhydrophobic nuclei which cannot be deactivated, unless with a high-speed liquid jet directed into the pit.

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