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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2011

Buckling resistance of solid shell bubbles under ultrasound

Résumé

Thin solid shell contrast agents bubbles are expected to undergo different volume oscillating behaviors when the acoustic power is increased: small oscillations when the shell remains spherical, and large oscillations when the shell buckles. Contrary to bubbles covered with thin lipidic monolayers that buckle as soon as compressed: the solid shell bubbles resist compression, making the buckling transition abrupt. Numerical simulations that explicitly incorporate a shell bending modulus give the critical buckling pressure and post-buckling shape, and show the appearance of a finite number of wrinkles. These findings are incorporated in a model based on the concept of effective surface tension. This model compares favorably to experiments when adjusting two main parameters: the buckling tension and the rupture shell tension. The buckling tension provides a direct estimation of the acoustic pressure threshold at which buckling occurs.
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Dates et versions

hal-00579264 , version 1 (23-03-2011)

Identifiants

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Philippe Marmottant, Ayache Bouakaz, Nico de Jong, Catherine Quilliet. Buckling resistance of solid shell bubbles under ultrasound. Journal of the Acoustical Society of America, 2011, 129 (3), pp.1231. ⟨10.1121/1.3543943⟩. ⟨hal-00579264⟩
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