INVESTIGADORES
URTEAGA raul
artículos
Título:
Dynamics of sonoluminescing bubbles within a liquid hammer devi
Autor/es:
RAÚL URTEAGA; PABLO GARCÍA MARTINEZ; FABIÁN J. BONETTO
Revista:
PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS
Editorial:
The American Physical Society
Referencias:
Año: 2008
ISSN:
1063-651X
Resumen:
We studied the dynamics of a single sonoluminescing bubble (SBSL) in a liquid hammer device.In particular, we investigated the phosphoric acid-xenon system, in which pulses up to four orders ofmagnitude brighter than SBSL in water systems (about 10^12 photons per pulse) have been previouslyreported [Chakravarty et al., Phys. Rev. E, 69, 066317 (2004)]. We used stroboscopic photographyand a Mie scattering technique in order to measure the radius evolution of the bubbles. Underadequate conditions we may position a bubble at the bottom of the tube (cavity) and a secondbubble trapped at the middle of the tube (upper bubble). During its collapse, the cavity producesthe compression of the liquid column. This compression drives impulsively the dynamics of theupper bubble. Our measurements reveal that the observed light emissions produced by the upperbubble are generated at its second collapse. We employed a simple numerical model to investigatethe conditions that occur during the upper bubble collapse. We found good agreement betweennumerical and experimental values for the light intensity (fluence) and light pulse widths. Resultsfrom the model show that the light emission is increased mainly due to an increase in noble gasambient radius and not because the maximum temperature increases. Even for the brightest pulsesobtained (2 × 10^13 photons, about 20W of peak power) the maximum temperatures computed forthe upper bubble are always lower than 20000K.