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Published on: May 9, 2021
Dynamics of sonoluminescing bubbles within a liquid hammer device
Raúl Urteaga1, Pablo Luis García-Martínez, Fabián J Bonetto
1Laboratorio de Cavitación y Biotecnología 8400, Instituto Balseiro/Centro Atómico Bariloche, RN, Argentina.
Summary
This study reveals that brighter sonoluminescent bubbles (SBSL) in phosphoric acid-xenon systems are primarily due to larger noble gas radii, not higher temperatures. The light emission originates from the second bubble collapse.
Area of Science:
- Acoustics
- Fluid Dynamics
- Physical Chemistry
Background:
- Single bubble sonoluminescence (SBSL) in phosphoric acid-xenon systems can produce significantly brighter light pulses compared to water systems.
- Previous research reported SBSL pulses up to 10^12 photons per pulse in these systems.
Purpose of the Study:
- Investigate the dynamics of single sonoluminescing bubbles (SBSL) in a liquid hammer device, focusing on the phosphoric acid-xenon system.
- Determine the conditions leading to enhanced light emission from SBSL.
Main Methods:
- Utilized stroboscopic photography and Mie scattering to measure bubble radius evolution.
- Employed a simple numerical model to simulate upper bubble collapse dynamics.
- Investigated the interaction between a collapsing cavity bubble and a second, upper bubble.
Main Results:
- Observed that light emissions from the upper bubble are generated during its second collapse.
- Found good agreement between numerical and experimental data for light intensity and pulse widths.
- Numerical models indicate increased light emission is mainly due to a larger noble gas ambient radius, not increased maximum temperature.
Conclusions:
- The enhanced brightness in phosphoric acid-xenon SBSL is primarily linked to the initial noble gas radius.
- Maximum temperatures during collapse remain below 20,000K, even for high-intensity pulses (up to 2x10^13 photons).
- The dynamics of the upper bubble are impulsively driven by the collapse of a lower cavity bubble.
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