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RESEARCH PAPERS

Effects of Nuclei Size Distribution on the Dynamics of a Spherical Cloud of Cavitation Bubbles

[+] Author and Article Information
Yi-Chun Wang

Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan

J. Fluids Eng 121(4), 881-886 (Dec 01, 1999) (6 pages) doi:10.1115/1.2823550 History: Received July 28, 1998; Revised July 06, 1999; Online December 04, 2007

Abstract

The nonlinear dynamics of a spherical bubble cloud with nuclei size distribution are studied numerically. The spectrum of nuclei is assumed uniform initially. The simulations employ a nonlinear continuum bubbly mixture model with consideration of the presence of bubbles of different sizes. This model is then coupled with the Rayleigh-Plesset equation for the dynamics of bubbles. A numerical method based on the integral representation of the mixture continuity and momentum equations in the Lagrangian coordinates is developed to solve this set of integro-differential equations. Computational results show that the nuclei size distribution has significant effects on the cloud dynamics in comparison to the results for a single bubble size. One important effect is that the bubble collapse is always initiated near the surface of the cloud, even if the cloud has a very small initial void fraction. This effect has an important consequence, namely that the geometric focusing of the bubbly shock wave is always a part of the nonlinear dynamics associated with the collapse of a spherical cloud with nuclei size distribution. The strength of the shock and the oscillation structure behind the shock front are suppressed due to the effects of multiple bubble sizes. Far-field acoustic pressures radiated by two bubble clouds, one of equal-size bubbles and the other with bubble size distribution, are also compared. It is found that the cloud containing bubbles of different sizes emits a larger noise than the cloud of identical bubbles. Explanations for this effect are also presented.

Copyright © 1999 by The American Society of Mechanical Engineers
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