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Na emission and bubble instability in single-bubble sonoluminescence.
Pak-Kon Choi1, Keisuke Takumori1, Hyang-Bok Lee1
1Department of Physics, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki 214-8571, Japan.
Ultrasonics Sonochemistry
|June 22, 2017
Summary
Sodium dodecyl sulfate (SDS) solutions exhibited sodium (Na) emission during single-bubble sonoluminescence (SBSL), driven by bubble dancing. This phenomenon, observed via high-speed imaging, correlated bubble path length with Na intensity, offering insights into sonoluminescence spectral components.
Area of Science:
- Physical Chemistry
- Acoustics
- Spectroscopy
Background:
- Single-bubble sonoluminescence (SBSL) is a phenomenon involving light emission from collapsing bubbles.
- Sodium (Na) emission has been observed in sonoluminescence, but the underlying mechanisms, especially in SBSL at low acoustic pressures, require further elucidation.
- Understanding spectral components in SBSL is crucial for characterizing the physical conditions within the bubble.
Purpose of the Study:
- To investigate the origin of Na emission in SBSL under specific experimental conditions.
- To correlate bubble dynamics, specifically bubble dancing, with Na emission intensity.
- To compare the spectral characteristics of Na emission in SBSL with those in multibubble sonoluminescence (MBSL).
Main Methods:
- Utilizing a 0.1mM sodium dodecyl sulfate (SDS) solution with dissolved noble gas.
- Employing high-speed shadowgraph movies at 30,000 frames per second to capture bubble dynamics.
- Analyzing the spectral components of Na emission in both SBSL and MBSL.
Main Results:
- Na emission was observed in SBSL at low acoustic pressure, where continuous spectral components were negligible.
- High-speed imaging revealed that bubble dancing, characterized by bubble disintegration and coalescence, was responsible for Na emission.
- A strong correlation was found between the measured bubble path length and the intensity of Na emission.
- The Na spectrum in SBSL exhibited a narrow component, distinct from the narrow and broad components observed in MBSL.
Conclusions:
- Bubble dancing, driven by bubble disintegration and coalescence, is the primary mechanism for Na emission in SBSL under the studied conditions.
- The observed correlation between bubble path length and Na intensity provides quantitative evidence for the role of bubble dynamics.
- The spectral differences between SBSL and MBSL indicate distinct conditions for Na emission generation in these two sonoluminescence regimes.
Keywords:
Bubble instabilityHigh-speed shadowgraphyMultibubble sonoluminescenceNa spectrumSingle-bubble sonoluminescenceMore Related Videos
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