3aPA3. Acoustic energy storage in single bubble sonoluminescence.

Session: Wednesday Morning, December 4

Time: 8:35

Author: Michael P. Brenner
Location: Dept. of Math., MIT, Cambridge, MA
Author: R. Ruben Rosales
Location: Dept. of Math., MIT, Cambridge, MA
Author: Sascha Hilgenfeldt
Location: Univ. Marburg, Marburg, Germany
Author: Detlef Lohse
Location: Univ. Marburg, Marburg, Germany


A gas bubble trapped in water by an oscillating acoustic field can emit visible bursts of light. Currently the energy focusing of this phenomenon (sonoluminescence) is understood as the converging of a shock toward the interior of the bubble. A complementary but alternative possibility is presented which stems from a linear hydrodynamic instability of the entire gas inside the bubble, leading to the storage of acoustic energy inside the bubble. This mechanism suggests a qualitatively different method for estimating the light intensities from the bubble than those given previously, identifying the hydrodynamic parameters which are important for determining the light intensity. A natural consequence of the theory is the presence of abrupt transitions in the light intensity as a function of experimental parameters, such as those previously observed by Weninger et al. [J. Phys. Chem. 99, 14195 (1995)]. These transitions are where energy input during the bubble collapse exactly balances energy dissipation throughout a cycle.

ASA 132nd meeting - Hawaii, December 1996