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Generation of subharmonics in acoustic resonators containing bubbly liquids: A numerical study of the excitation threshold and hysteretic behavior

Abstract : In this paper we study the generation and behavior of subharmonics in a bubbly liquid confined in an acoustic resonator, through numerical simulations carried out at finite-amplitude acoustic pressure. Several configurations in terms of resonator length and driving frequency are considered here. Our results show that these frequency components, created from a higher-frequency signal at the source (ultrasound), are due to the nonlinearity of the medium at high acoustic-pressure amplitude and to the configuration of the resonator (geometry and boundaries). We also show that they have an amplitude-threshold dependence, which is in concordance with the literature. The response of these subharmonics to different sequences of pressure amplitudes also reveals the hysteretic nature of the bubbly liquid.
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Submitted on : Tuesday, July 5, 2022 - 3:35:34 PM
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María Teresa Tejedor Sastre, Olivier Louisnard, Christian Vanhille. Generation of subharmonics in acoustic resonators containing bubbly liquids: A numerical study of the excitation threshold and hysteretic behavior. Ultrasonics Sonochemistry, Elsevier, 2022, 88, pp.106068. ⟨10.1016/j.ultsonch.2022.106068⟩. ⟨hal-03713005⟩

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