Positional stability as the light emission limit in sonoluminescence with sulfuric acid

Abstract

We studied a single bubble sonoluminescence system consisting of an argon bubble in a sulfuric acid aq. solution. We experimentally determined the relevant variables of the system. We also measured the bubble position, extent of the bubble orbits, and light intensity as a function of acoustic pressure for different argon concentrations. We find that the Bjerknes force is responsible for the bubble mean position and this imposes a limitation in the maximum acoustic pressure that can be applied to the bubble. The Rayleigh-Taylor instability does not play a role in this system and, at a given gas concentration, the SL intensity depends more on the bubble time of collapse than any other investigated parameter.

Stable tridimensional bubble clusters in multi-bubble sonoluminescence (MBSL)

“…explained in [12] and then named as ''intermediate bubbles'' in the theoretical work [38]. Bubbles with a big ambient radius (e.g.…”

“…This phenomenon called Sonoluminescence, can be classified into two types depending on the bubbles mean ''lifetime''. In ''transient'' cavitation the bubbles do not last longer than a few acoustic cycles [8], whereas in ''stable'' sonoluminescence bubbles do not dissolve nor breaks, and can be held as long as the bubble environment remains unchanged [9][10][11][12]. In the stable case, a bubble can be positionally unstable changing its mean position inside the acoustic resonator, or spatially unstable describing quasiperiodic orbits around a constant mean position.…”

“…Recently, Rechiman et al [18] reproduced those experimental results by means of a numerical code that solves the bubble radial dynamics coupled with the translational dynamics and discussed the role of the various forces acting over the bubble on the positional and spatial instabilities. In SBSL with SA the limiting agent over the acoustic pressure that could be applied on the bubble is mainly given by the primary Bjerknes force, whose effect is to displace the bubble away from the pressure antinode [12,[16][17][18]. In 2013, we showed through experiments and numerical simulations in SA that an increase in the static pressure (P 0 ) shifts the positional instability frontier to higher acoustic pressures, which resulted in a significant increase of the energy focusing during the bubble collapse [19].…”

Sonoluminescence: Experiments and models (Review)

“…The second group of liquids is characterized by ρ 0 < 10 3 Ω m. It includes concentrated aqueous solu tions (65-85 wt %) of sulfuric acid [9,10,13,17,[79][80], phosphoric acid [11,81], and various salt solu tions. For example, aqueous solutions of NaCl (KCl) [59,[82][83][84][85], as well as LnCl 3 and Ln(NO 3 ) 2 , where Ln is Ce, Pr, Tb, Eu, Gd, or Dy [86][87][88]; solutions of Fe(CO) 5 , Cr(CO) 6 , and Mo(CO) 6 in octanol, dode cane, and silicone oil [85,89,90].…”

Charakterisierung von Kavitationsblasenpopulationen

“…Eine Änderung des Mediums Wasser hin zu viskoseren Flüssigkeiten mit einem niedrigeren Dampfdruck (z. B. Phosphorsäure [118] oder Schwefelsäure [87,[119][120][121]) erhöht noch einmal die Lichtausbeute. Andererseits wird sie geschwächt oder sogar ganz unterdrückt bei steigender Konzentration an Methylester und Ketonen in der Flüssigkeit [122].…”