J.P. Lewis, S. Gardner, and I. Corp
Modelling, simulation, finite element, optimization, validation
This paper describes the use of finite element software to provide a two-dimensional time harmonic analysis of cavitational activity within an ultrasonic cleaning vessel as used within hospitals and dental surgeries. A rational for the simulation method utilized and input parameters affecting the model is discussed. Practical affirmation of the model is provided via qualitative methods (the industry standard HTM2030 foil erosion test) and quantitative data are obtained from an ultrasonic cavitational probe. Simulated data from the finite element model and that obtained practically are compared, with both sets of results showing a good level of agreement and indicating a correlation between those areas of maximum pressure variation and cavitational field strength. Limitations and implications of the results are discussed along with future directions for research, including the development of a three-dimensional model to provide a more accurate reflection pattern from the boundary geometries within the ultrasonic cleaning vessel. Quantification of the results of reflections is discussed as a future development plan, as is correlating the field strength predicted to cleaning efficacy via test soil analysis.
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