Numerical Investigation of Acoustic Cavitation as a Novel Method of Dental Plaque Removal

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• Kawa Manmi (School of Mathematics)
• Thursday 17 January 2019, 12:00-13:00
• PHYW-LT (117).

If you have a question about this talk, please contact Fabian Spill.

Recently microbubble dynamics due to ultrasound have become a hot research topic, because it is associated with important applications in cavitation cleaning, chemical reactions (sonochemistry), and biomedical ultrasound. In the first part of the talk, modelling three dimensional microbubble dynamics subject to high intensity ultrasound using the boundary integral method (BIM) will be presented. The viscous effects are incorporated into the model through including the normal viscous stress of the irrotational flow in the dynamic boundary condition at the bubble surface. The second part of the talk, will be about the research project (EPSRC grant) in progress entitled “Maximising cavitation to clean dental implants”. Cavitation occurs in the cooling water flowing over dental ultrasonic scalers which are used by dental professionals to mechanically remove hardened dental plaque calculus. Two aspects is considered to maximize the cavitation around dental ultrasonic scalers. Firstly, we will investigate vibrations and the acoustic pressure amplitude of the scaler to increase the cavitation. To do this, the coupled acoustic-structural algorithm in the ABAQUS software is adopted to simulate the vibration of the ultrasonic scaler tip. Secondly the interactions between microbubbles, and between bubbles and a wall require investigation. The dynamics of microbubble(s) near a rigid wall was modelled based on mass and momentum conservations coupled with the non-linear equation of states with the aid of the open-source OPENFOAM package. The model was validated with the Keller Miksis equation and several shockwaves of the collapsing bubble near a rigid boundary were reproduced.

This talk is part of the Applied Mathematics Seminar Series series.

This talk is included in these lists:

• Applied Mathematics Seminar Series
• PHYW-LT (117)
• School of Mathematics events

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