Experimental study and analytical model of the cavitation ring region with small diameter ultrasonic horn.
Experiments of cavitation erosion are performed on a surface using the "stationary specimen method". A small diameter horn of 5 mm is selected instead of using the standard horn of 15.9 mm. The experiments are performed according to these parameters: an excitation frequency of the horn of 20 kHz, a gap between the horn and the specimen within the range from 0.05 to 0.5 mm and the displacement amplitude of the horn within a range of 15-50 μm. After examination of the samples, two erosion patterns can be clearly distinguished, one circular shape centred in the origin and a ring shape around. Moreover, it has been observed that the diameter of this ring shape, the cavitation ring region, is a function that depends on the amplitude and the gap. Existence of the cavitation ring region under the mentioned conditions is explained using a theoretical model based on the combination of Fluid Mechanics and Analytical Mechanics. Results after application of this model reveal the satisfactory agreement between the numerical output and the experimental data.
García-Atance Fatjó
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Sustainable Design Research Centre, School of Design, Engineering and Computing, Bournemouth University, Poole House 238, Bournemouth BH12 5BB, UK. ggafatjo@bournemouth.ac.uk
Torres Pérez
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Hadfield
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D000537:Aluminum Oxide / Q000737:chemistry*; D008956:Models, Chemical; D010316:Particle Size; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014465:Ultrasonics
D014025:Titanium; D000537:Aluminum Oxide