Sonoluminescence from single bubbles

Abstract

Sonoluminescence (SL) is generally attributed to the radiative recombination of hydroxyl radicals produced by the high temperatures and pressures associated with cavitation bubble collapse. SL from a single bubble has been observed in a levitation cell at 20 kHz, which supports this assumption. The pressure amplitudes ranged from 110 kPa for water to 170 kPa for 60% glycerin in water. Pulsation amplitudes were measured to be between five and ten times the equilibium radius. Such large amplitude steady-state pulsations have never been observed before. The possible mechanisms by which stability is maintained will be discussed and theoretical calculations of temperatures and pressures inside the bubble will be presented. [Work supported by ONR.]

Plasma Formation during Acoustic Cavitation: Toward a New Paradigm for Sonochemistry

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HBT interferometry: historical perspective

“…The focus was in a small sonoluminescent bubble, whose radius would lie in the range R ∼ 10 −5 m. The phenomenon had been discovered long time ago, in 1934, at the Univ. of Cologne, but its single bubble version was found out by Gaitan et al [47] only in 1988. In this last case, a single bubble of gas (usually filled with air) formed in water, is trapped by standing acoustic waves, contracting every 10-12 pico-sec approximately, and simultaneously emitting light.…”

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