Acoustique des milieux bulleux : Applications à la conception de métamatériaux et à la manipulation de bulles

Abstract : A bubble undergoing an acoustic wave is likely to oscillate. The displacement of the air-fluid interface generates a local compression of the outer fluid where a scattered wave is thus created. This very simple mechanism has been successfully described by the famous Rayleigh-Plesset formula derived at the beginning of the previous century. At low frequencies, the resonant behavior (Minnaert) is responsible for a strong enhancement of the oscillations of the bubble which thus becomes a very efficient scatterer. In a realistic media, bubbles are not isolated. The interferences occurring between an infinity of scattering sequences make the description of the propagation a lot harder to achieve. In this thesis, we introduce the effective theories that are classically adopted to describe random bubbly liquids. After being compared to our numerical results, these theories are used in order to design bubbly materials featuring some interesting properties such as superfocusing or negative refraction. The case of periodic assembly is addressed as well for both a simple square lattice bubble raft and a cubic centered faces bi-periodic crystal. We show that the periodicity induces an explicit modification in the dispersion of the medium and offers a simple tunable parameter. At last, we focus on the possibility for the bubble to move inside the host fluid and which is thus likely to experience an acoustic radiation pressure called Bjerknes force. We show how the secondary Bjerknes force, resulting from the wave scattered by a bubble toward its neighbors, can be exploited in order to manipulate one or several free bubble flowing near one or several trapped bubbles.
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  • HAL Id : tel-01494543, version 1

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Maxime Lanoy. Acoustique des milieux bulleux : Applications à la conception de métamatériaux et à la manipulation de bulles. Physique [physics]. Université Paris Denis Diderot, 2016. Français. ⟨tel-01494543⟩

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