title: Viscosity destabilizes sonoluminescing bubbles.
abstract: In single-bubble sonoluminescence (SBSL) microbubbles are trapped in a standing sound wave, typically in water or water-glycerol mixtures. However, in viscous liquids such as glycol, methylformamide, or sulphuric acid it is not possible to trap the bubble in a stable position. This is very peculiar as larger viscosity normally stabilizes the dynamics. Suslick and co-workers call this new mysterious state of SBSL "moving-SBSL." We identify the history force (a force nonlocal in time) as the origin of this destabilization and show that the instability is parametric. A force balance model quantitatively accounts for the observed quasiperiodic bubble trajectories.
authors.affiliation: Faculty of Science & Technology, University of Twente, Post Office Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Ruediger
authors.initials: R
authors.lastname: Toegel
authors.forename: Stefan
authors.initials: S
authors.lastname: Luther
authors.forename: Detlef
authors.initials: D
authors.lastname: Lohse