Single-bubble sonoluminescence in air-saturated water

Area of Science:

• Acoustics
• Fluid Dynamics
• Physical Chemistry

Background:

• Single bubble sonoluminescence (SBSL) is a phenomenon where bubbles emit light when subjected to acoustic waves.
• Previous studies primarily focused on SBSL in degassed liquids, leaving behavior in non-degassed conditions less explored.

Purpose of the Study:

• To investigate and characterize single bubble sonoluminescence in air-saturated water at ambient conditions.
• To compare the dynamics and light emission of SBSL in air-saturated water with those in degassed water.
• To explore the potential for a unified interpretation of single and multibubble sonoluminescence.

Main Methods:

• Experimental realization of SBSL in air-saturated water at room temperature and ambient pressure.
• Detailed observation and analysis of bubble dynamics, including oscillation, translation, and position variability.
• Comparison of experimental results with theoretical models for bubble shape stability and mass diffusion.
• Time-resolved characterization of light emission for synchronous and recycling SBSL.

Main Results:

• SBSL in air-saturated water exhibits behavior comparable to degassed water, with notable differences in bubble position variability.
• Calculated shape stability borders align with experimental observations, though equilibrium radii predictions from mass diffusion models show slight discrepancies.
• Streamer structure formation is observed in the presence of bubble nuclei within the same parameter range.

Conclusions:

• The study demonstrates the feasibility and characteristics of SBSL in air-saturated water.
• Findings suggest that SBSL in non-degassed liquids shares similarities with degassed conditions, but with altered spatial dynamics.
• The observation of streamer structures offers a potential link towards a unified understanding of both single and multibubble sonoluminescence.