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Conference Presentation: "The effects of ambient acceleration on Bubble dynamics and single bubble sonoluminescence", by Sean C. Wyatt, R. Glynn Holt, and Ronald A. Roy. Abstract: In order to prepare for pending experiments in variable-g environments some of the multiple effects caused by the time-varying acceleration of acoustic resonators used in bubble levitation experiments are considered. The coupled effects of the induced changes in ambient pressure (due to a change in the buoyant body force) are modeled. Changing the ambient pressure while holding the acoustic pressure amplitude constant, causes changes in the radial bubble response and diffusive equilibrium requirements. Changing the bubble levitation position causes both the local acoustic pressure amplitude and gradient to change, which will again impact bubble response. If the bubble must remain in stable diffusive equilibrium, both of these effects will force the bubble equilibrium radius to change. Finally, by using an empirical relationship for emitted SL intensity versus bubble response, the variation of emitted light intensity as a function of the changing ambient acceleration is obtained. |
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