Nucleation threshold and deactivation mechanisms of nanoscopic cavitation nuclei

Share/Save/Bookmark

Borkent, Bram M. and Gekle, Stephan and Prosperetti, Andrea and Lohse, D. (2009) Nucleation threshold and deactivation mechanisms of nanoscopic cavitation nuclei. Physics of Fluids , 21 (10). p. 102003. ISSN 1070-6631

[img]
Preview
PDF
393Kb
Abstract:The acoustic nucleation threshold for bubbles trapped in cavities has theoretically been predicted within the crevice theory by Atchley and Prosperetti [“The crevice model of bubble nucleation,” J. Acoust. Soc. Am. 86, 1065 (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 good agreement with the theoretical predictions of Atchley and 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.
Item Type:Article
Copyright:© 2009 American Institute of Physics
Faculty:
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/68546
Official URL:http://dx.doi.org/10.1063/1.3249602
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 259111