Applied Math And CNCS Seminar
Tuesday, February 3, 1998, 2:15pm, 119 Physics
Lou Kondic (Dept of Math, Duke University)
Single Bubble Sonoluminescence: Why is it still interesting?
Abstract:
Shock theories seem to be able to explain most of the experimental facts about single bubble sonoluminescence (SBSL). Still, many questions remain to be answered, concerning the limits on energy concentration which can be achieved, the mass transfer mechanism between a bubble and surrounding liquid, the differences between SL for single and multiple bubble SL, etc. After giving a basic overview of the current state of affairs in the field of SL, and of (our) shock theory, I will present a theoretical analysis of the influence of ambient pressure on SBSL. Variation of ambient pressure modifies the bubble dynamics and furthermore it changes the equilibrium bubble size through modification of the diffusion (?) mass flow between the bubble and the surrounding liquid. A simple measurement of the equilibrium bubble size shell give a clear answer about the validity of the diffusion theory and various mass-ejection hypotheses, in particular the idea of ``argon bubbles'' put forward by D. Lohse et al (recent CNCS seminar). The results for SL radiation are compared with preliminary experimental data, and a good agreement is found. Variation of ambient pressure provides simple and interesting test for a validity of various SL theories, diffusive or non-diffusive mass flow ideas and stability analyses.

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