On étudie ici l'instabilité de position d'un cristal sphérique dans un champ acoustique. Etant donné la force de Bjerknes, un cristal dont la position se trouve décalée par rapport à un ventre de pression se déplace dans le champ acoustique. Ce déplacement, stable dans le cas des bulles de cavitation, s'avère instable en cristallisation. Cet effet est étudié en fonction du nombre d'Atwood.
The instability of position of a growing spherical crystal in an acoustic field is studied. Due to the Bjerknes force, a spherical crystal, whose position is shifted from an antinode of pressure, moves in the acoustic field. This displacement, stable in the case of bubbles in a cavitation experiment, turns out to be unstable in the case of crystallization. This effect is studied for an arbitrary Atwood number.
Mot clés : Acoustique, Ondes, Vibrations, Cristallisation, Helium solide, Force de Bjerknes, Cavitation
Martine Ben Amar 1
@article{CRMECA_2004__332_5-6_361_0, author = {Martine Ben Amar}, title = {The {Bjerknes} instability during crystal nucleation by acoustic waves}, journal = {Comptes Rendus. M\'ecanique}, pages = {361--365}, publisher = {Elsevier}, volume = {332}, number = {5-6}, year = {2004}, doi = {10.1016/j.crme.2004.02.002}, language = {en}, }
Martine Ben Amar. The Bjerknes instability during crystal nucleation by acoustic waves. Comptes Rendus. Mécanique, Volume 332 (2004) no. 5-6, pp. 361-365. doi : 10.1016/j.crme.2004.02.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.02.002/
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