Document Detail


Experimental study of transient paths to the extinction in sonoluminescence.
MedLine Citation:
PMID:  19045640     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An experimental study of the extinction threshold of single bubble sonoluminescence in an air-water system is presented. Different runs from 5% to 100% of air concentrations were performed at room pressure and temperature. The intensity of sonoluminescence (SL) and time of collapse (t(c)) with respect to the driving were measured while the acoustic pressure was linearly increased from the onset of SL until the bubble extinction. The experimental data were compared with theoretical predictions for shape and position instability thresholds. It was found that the extinction of the bubble is determined by different mechanisms depending on the air concentration. For concentrations greater than approximately 30%-40% with respect to the saturation, the parametric instability limits the maximum value of R(0) that can be reached. On the other hand, for lower concentrations, the extinction appears as a limitation in the time of collapse. Two different mechanisms emerge in this range, i.e., the Bjerknes force and the Rayleigh-Taylor instability. The bubble acoustic emission produces backreaction on the bubble itself. This effect occurs in both mechanisms and is essential for the correct prediction of the extinction threshold in the case of low air dissolved concentration.
Authors:
Raúl Urteaga; Damián Dellavale; Gabriela F Puente; Fabián J Bonetto
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  124     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-12-02     Completed Date:  2009-02-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1490-6     Citation Subset:  IM    
Affiliation:
Laboratorio de Cavitacion y Biotecnologia, Instituto Balseiro-CAB-CONICET, R8402AGP-Av. Bustillo Km. 9,5-San Carlos de Bariloche-Rio Negro, Argentina.
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MeSH Terms
Descriptor/Qualifier:
Air*
Linear Models
Luminescence*
Models, Theoretical
Pressure
Temperature
Time Factors
Ultrasonics*
Water*
Chemical
Reg. No./Substance:
7732-18-5/Water

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