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Abstract

Nuclei, or microbubble, populations are inextricably linked to tip vortex cavitation (TVC) inception and dynamics. In order to gain a better quantitative understanding of this relationship, high-speed video measurements were taken in a cavitation tunnel of TVC inception locations about an elliptical hydrofoil in flows with mono- and polydisperse injected nuclei populations. Sample sizes of O(1000) were acquired. For both populations, inception occurred between 0.02 chord lengths upstream of the hydrofoil tip and about 2.1 chord lengths downstream along the cavity trajectory. However, inception location distribution varied significantly with nuclei population. This is explained by the higher concentrations of weaker nuclei in the monodisperse case, which increases the distance along the vortex within which nuclei are susceptible to cavitation. These results provide the foundation for studies on TVC dynamics and acoustics.

Item Type:	Conference Publication
Authors/Creators:	Khoo, MTB and Venning, JA and Pearce, BW and Brandner, PA
Keywords:	cavitation, trailing vortices, tip vortex cavitation, cavitation nuclei, bubble dynamics
Journal or Publication Title:	Proceedings of the 22nd Australasian Fluid Mechanics Conference AFMC2020
Publisher:	The University of Queensland
DOI / ID Number:	10.14264/015283f
Related URLs:	Google Scholar: Venning, JA UTAS Profile: Venning, JA Google Scholar: Pearce, BW UTAS Profile: Pearce, BW Google Scholar: Brandner, PA UTAS Profile: Brandner, PA
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