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Applications of cavitation dynamics in a three fluid system

Esson, Mark David (2015)
Ph.D. thesis, University of Birmingham.

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Abstract


In this thesis a numerical method is developed for modelling multiple bubbles with axis-symmetric geometry, in a domain of three fluids separated by two fluid-fluid interfaces. The density ratios across these interfaces can vary allowing simulations of bubble inter-action with rigid boundaries, free surfaces and any density ratio values between these two extremes. The inclusion of buoyancy and surface tension into the simulations allow for a wide array of possible models, including investigations into explosion bubbles and biomedical applications. The evolution of the bubble is analysed in various scenarios right through to the toroidal stage of bubble collapse.

The numerical simulations are conducted using the boundary integral method with vortex ring calculations for modelling the bubble transition from the simply connected bubble to the doubly connected toroidal phase. The numerical method is then compared with numerical and experimental data from other work to verify the validity of the model. The results show good agreement with past numerical results for spherical bubble oscillations and rigid boundary collapse.

The verified model is then used to simulate a multitude of scenarios to investigate two bubble interaction with applications to mixing. A range of parameters are investigated and results are given for an optimal mixing approach. The introduction of a curved density interface is explored to determine the effect it has on bubble collapse. The curved interface collapse is then adapted to consider bubble collapse near a cell wall.

Type of Work:Ph.D. thesis.
Supervisor(s):Leppinen, D.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mathematics
Subjects:QA Mathematics
Institution:University of Birmingham
ID Code:5986
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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