Acoustic properties of emulsions with locally resonant scatterers
Langue
en
Communication dans un congrès avec actes
Ce document a été publié dans
Acoustics 2012 Nantes, Acoustics 2012, 2012-04-23, Nantes. 2012-04-23
Résumé en anglais
We present the results of ultrasonic pulse propagation experiments on dilute emulsions of resonant scatterers. Thanks to microfluidics, we achieved highly monodisperse oil-droplet dispersions embedded in a Bingham fluid. ...Lire la suite >
We present the results of ultrasonic pulse propagation experiments on dilute emulsions of resonant scatterers. Thanks to microfluidics, we achieved highly monodisperse oil-droplet dispersions embedded in a Bingham fluid. Underwater measurements allowed us to evidence up to about ten sharp Mie resonances, on both the acoustic attenuation and the phase velocity in the MHz range. These ultrasonic experiments are compared to theoretical predictions derived within the framework of the independent scattering approximation with an excellent quantitative agreement. The influence of the emulsion polydispersity is also investigated as well as the dependence of the acoustic properties on both size droplet and volume fraction in dilute regimes, for which the coupling between scatterers is negligible.< Réduire
Mots clés en anglais
Mie scattering resonances
oil-in-gel emulsions
acoustic characterization
Origine
Importé de halUnités de recherche