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Cavitation associated with the impact of a sphere on a flat surface is investigated using high-speed photography. The sphere, of diameter 15 or 45 mm and made from Ertacetal^® or stainless steel, was fully submerged and accelerated using a spring-loaded mechanism to achieve Reynolds numbers based on impact velocity and sphere radius of up to 7.2×10⁴. The static pressure and impact velocity were varied to achieve cavitation numbers ranging from 8.9 to 120.9. High-speed photography of the impacting sphere and induced cavitation bubble was filmed at 105-140 kHz. A log law relationship was found between the non-dimensional maximum bubble radius and the cavitation number. The relationship was modulated by the material properties. Interaction between the sphere and the bubble was also noted.

Item Type:	Refereed Conference Paper
Keywords:	impact cavitation, sphere, bubble dynamics, high-speed imaging
Research Division:	Engineering
Research Group:	Maritime Engineering
Research Field:	Ship and Platform Hydrodynamics
Objective Division:	Manufacturing
Objective Group:	Transport Equipment
Objective Field:	Nautical Equipment (excl. Yachts)
Author:	De Graaf, KL (Dr Katrina De Graaf)
Author:	Brandner, PA (Associate Professor Paul Brandner)
Author:	Pearce, BW (Dr Bryce Pearce)
Author:	Lee, JY (Mr Jun Lee)
ID Code:	106496
Year Published:	2015
Deposited By:	NC Maritime Engineering and Hydrodynamics
Deposited On:	2016-02-11
Last Modified:	2016-08-01
Downloads:	21 View Download Statistics