Nonlinear multiple scattering of acoustic waves by a layer of bubbles
1 Laboratoire Matière et Systèmes Complexes (MSC) - Université Paris-Diderot, CNRS UMR 7057, Paris, France
2 Institut Langevin, ESPCI ParisTech, CNRS (UMR 7587), PSL Research University - Paris, France
Received: 23 September 2015
Accepted: 16 October 2015
We present a theoretical and experimental study of the acoustic second-harmonic generation by a single layer of bubbles. This simple system allows us to investigate the subtle interplay between nonlinear effects and multiple scattering. A perturbative model is shown to give an excellent agreement with the experimental measurements, and we demonstrate the existence of an optimal concentration of bubbles, for which the harmonic generation is maximum. The potential of bubble screens as efficient subwavelength acoustic nonlinear sources is discussed.
PACS: 43.25.+y – Nonlinear acoustics / 46.40.Cd – Mechanical wave propagation (including diffraction, scattering, and dispersion)
© EPLA, 2015