1.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics
; 61(5A): 5278-86, 2000 May.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11031575
RESUMO
The stability of a bubble levitated in an acoustic field under single bubble sonoluminescence conditions was numerically investigated taking thermal noise effects into consideration. Due to the microscopic size of a sonoluminescing bubble thermal noise is important to its surface and is found to cause small irregularities in its spherical shape. A stochastic differential equation in Langevin form is derived to describe the dynamics of a perturbation from the spherical and solved together with the Rayleigh-Plesset equation. The mechanisms responsible for the amplification of small irregularities are examined and a stability threshold is derived, which is in good agreement with experimental threshold data of Holt and Gaitan.