Document Detail


Modelling of free radicals production in a collapsing gas-vapour bubble.
MedLine Citation:
PMID:  11237048     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
This paper deals with a model linking bubble dynamics under an acoustic pressure field and production of free radicals in the resulting collapses of this bubble. The bubble dynamics model includes interdiffusion of gas and vapour in the bubble as well as evaporation or condensation at the interface, and it assumes uniformity of the internal pressure and perfect gas law for the gas vapour mixture. At the maximum compression of the bubble, all the reactions of dissociation which can occur are assumed at thermodynamic equilibrium. The local composition (especially in free radicals) in the bubble is then calculated by an algorithm based on free energy minimization using the information concerning the maximum compression provided by the bubble dynamics model resolution. Using this model a comparison of free radicals production has been made for two different driving frequencies (20 kHz and 500 kHz), and at given bubble radius and acoustic pressure, an optimum of liquid bulk temperature has been derived for the production of free radicals very similar to the experimental one concerning oxidation reactions in aqueous phase.
Authors:
S Sochard; A M Wilhelm; H Delmas
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ultrasonics sonochemistry     Volume:  4     ISSN:  1350-4177     ISO Abbreviation:  Ultrason Sonochem     Publication Date:  1997 Apr 
Date Detail:
Created Date:  2001-03-09     Completed Date:  2001-04-05     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  9433356     Medline TA:  Ultrason Sonochem     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  77-84     Citation Subset:  -    
Affiliation:
Ecole Nationale Supérieure d'Ingenieurs de Génie Chiminiue, Laboratoire de Génie Chimique, CNRS UMR 5503, Toulouse, France.
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