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Article Dans Une Revue Ultrasonics Sonochemistry Année : 2014

Effects of argon sparging rate, ultrasonic power, and frequency on multibubble sonoluminescence spectra and bubble dynamics in NaCl aqueous solutions

Carlos Cairós
  • Fonction : Auteur
Rachel Pflieger
Robert Mettin
  • Fonction : Auteur

Résumé

The sonoluminescence spectra from acoustic cavitation in aqueous NaCl solutions are systematically studied in a large range of ultrasonic frequencies under variation of electrical power and argon sparging. At the same time, bubble dynamics are analysed by high-speed imaging. Sodium line and continuum emission are evaluated for acoustic driving at 34.5, 90, 150, 365, and 945 kHz in the same reactor vessel. The results show that the ratio of sodium line to continuum emission can be shifted by the experimental parameters: an increase in the argon flow increases the ratio, while an increase in power leads to a decrease. At 945 kHz, the sodium line is drastically reduced, while the continuum stays at elevated level. Bubble observations reveal a remarkable effect of argon in terms of bubble distribution and stability: larger bubbles of non-spherical shapes form and eject small daughter bubbles which in turn populate the whole liquid. As a consequence, the bubble interactions (splitting, merging) appear enhanced which supports a link between non-spherical bubble dynamics and sodium line emission.

Dates et versions

hal-02461663 , version 1 (30-01-2020)

Identifiants

Citer

Carlos Cairós, Julia Schneider, Rachel Pflieger, Robert Mettin. Effects of argon sparging rate, ultrasonic power, and frequency on multibubble sonoluminescence spectra and bubble dynamics in NaCl aqueous solutions. Ultrasonics Sonochemistry, 2014, 21 (6), pp.2044-2051. ⟨10.1016/j.ultsonch.2014.03.006⟩. ⟨hal-02461663⟩
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