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Related Concept Videos

Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Hydrodynamic approach to multibubble sonoluminescence.

Shahid Mahmood1, Yungpil Yoo1, Jaekyoon Oh1

  • 1Mechanical Engineering Department, Chung-Ang University, Seoul 156-756, Republic of Korea.

Ultrasonics Sonochemistry
|February 18, 2014
PubMed
Summary

Radiation pressure from synchronized microbubbles significantly alters bubble dynamics during ultrasound. This effect, crucial for understanding multibubble sonoluminescence, was accurately modeled and validated experimentally.

Keywords:
Bubble clusterMultibubble sonoluminescencePulse widthRadiation pressure

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Area of Science:

  • Fluid dynamics
  • Acoustics
  • Bubble dynamics

Background:

  • Microbubble clusters subjected to ultrasound exhibit complex behaviors.
  • Synchronized bubble motion generates significant radiation pressure fields.
  • Understanding these interactions is key to sonoluminescence research.

Purpose of the Study:

  • To investigate the velocity profile and radiation pressure field in microbubble clusters.
  • To model the effect of radiation pressure on individual bubble behavior within a cluster.
  • To compare calculated sonoluminescence parameters with experimental data.

Main Methods:

  • Solving continuity and momentum equations for bubbly mixtures.
  • Incorporating radiation pressure effects into bubble dynamics calculations.
  • Modifying the Keller-Miksis equation to include radiation pressure terms.

Main Results:

  • Radiation pressure increases the effective mass of bubbles, leading to slower expansion and smaller maximum size.
  • Calculated light pulse width and spectral radiance closely matched experimental values.
  • The model accurately predicted multibubble sonoluminescence conditions.

Conclusions:

  • Synchronized microbubble motion and resulting radiation pressure are critical factors in bubble cluster dynamics.
  • The developed model provides a reliable method for predicting sonoluminescence phenomena.
  • Accurate modeling of radiation pressure enhances understanding of acoustic cavitation.