Upscaling energy concentration in multifrequency single-bubble sonoluminescence with strongly degassed sulfuric acid

DAMIAN DELLAVALE; LUDMILA RECHIMAN; JUAN MANUEL ROSSELLO, ; FABIAN BONETTO

PHYSICAL REVIEW E

AMER PHYSICAL SOC

Lugar: New York; Año: 2012 p. 16320 - 163206

1539-3755

Single-bubble sonoluminescence (SBSL) was explored under a variety of multifrequency excitations. Inparticular, biharmonic excitation was used to produce SBSL for unprecedented low dissolved noble gasconcentrations in a sulfuric acid solution. Reducing the amount of dissolved noble gas makes it possible toreach higher acoustic pressures on the SL bubble, which otherwise are not attainable because of the Bjerknesinstability. By using biharmonic excitation, we were able to experimentally trap and to spatially stabilize SLbubbles for xenon pressure overhead as low as 1 mbar. As a result, we have access to regions in phase spacewhere the plasma temperatures are higher than the ones reached before for bubbles driven at ≈30 kHz.