Numerical simulation of cavitation-induced bubble dynamics near a solid surface

Minsier, Vincent
(2010)

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  • Minsier, VincentUCLouvain
    author
Supervisors
Proost, Joris
 ;
De Wilde, Juray
Abstract
(en) Acoustic cavitation is a process in which bubbles are nucleated and oscillating in an acoustic field. When such bubbles collapse near a solid surface, the interaction of the resulting shock waves and micro-jets with the solid surface can be engineered for a number of applications, like surface cleaning in microelectronics, sonoporation in biomedical applications, and improvements in steel pickling performance in the metallurgical industries. Unfortunately, it is experimentally quite challenging to study such cavitation-induced bubble dynamics due to the randomness of the phenomenon and the associated small time and length scales. In this work, we have simulated both shock wave emission during the collapse of a spherical bubble, and jet penetration during aspherical bubble collapse near a solid surface. As to the first part, the propagation of shock waves in the liquid has been simulated combining the Gilmore model and the method of characteristics. Simulations have shown that shock waves can be responsible for structural damage observed during acoustic cavitation-induced cleaning in microelectronics. In a second part, the collapse of a bubble near a solid surface has been simulated by a two-phase flow model. In this model, the Navier-Stokes equations are solved on a Cartesian mesh and the interface is represented and tracked by the Volume Of Fluid method. The main advantage of this approach is that it allows to take into account the liquid viscosity in the numerical model. Our simulations have shown that the evolution of the bubble shape with time is in good agreement with experimentally observed laser-induced bubble dynamics. Using this model, simulations of laser-induced and acoustic-induced bubble dynamics have been carried out.
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Minsier, V. (2010). Numerical simulation of cavitation-induced bubble dynamics near a solid surface. https://hdl.handle.net/2078.5/129073