Manipulation et interaction de micro-bulles sous champ acoustique

Abstract : This thesis is about the action of acoustic waves on micrometer-sized bubbles excited at their resonance frequency. Indeed, bubbles can be considered as mechanical oscillators and the acoustic forces at the resonance, called Bjerknes forces, have non ordinary properties. Moreover, the bubbles interact between them by the emission of a secondary acoustic field, leading to their self-organization on a periodic mesh. Here, the bubbles are confined in microchannels, they are not spherical and rub against the walls. The experimental study of the acoustic forces (primary and secondary force) is thus preceded by the modeling of the bubble flow, linking the wall friction to the applied external forces. Several applications dedicated to the lab-on-a-chip are developped, with the size sorting, the controlled asymetric break-up, the automatic switching at a bifurcation and the manipulation of drops.
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Submitted on : Wednesday, November 17, 2010 - 11:53:32 AM
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David Rabaud. Manipulation et interaction de micro-bulles sous champ acoustique. Dynamique des Fluides [physics.flu-dyn]. Université Joseph-Fourier - Grenoble I, 2010. Français. ⟨tel-00536932⟩

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