Acoustic emission associated with the bursting of a gas bubble at the free surface of a non-Newtonian fluidReport as inadecuate




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1 Phys-ENS - Laboratoire de Physique de l-ENS Lyon 2 NLPL - Laboratorio de Fisica No Lineal

Abstract : We report experimental measurements of the acoustic emission associated with the bursting of a gas bubble at the free surface of a non-Newtonian fluid. On account of the viscoelastic properties of the fluid, the bubble is generally elongated. The associated frequency and duration of the acoustic signal are discussed with regard to the shape of the bubble and successfully accounted for by a simple linear model. The acoustic energy exhibits a high sensitivity to the dynamics of the thin film bursting, which demonstrates that, in practice, it is barely possible to deduce from the acoustic measurements the total amount of energy released by the event. Our experimental findings provide clues for the understanding of the signals from either volcanoes or foams, where one observes respectively, the bursting of giant bubbles at the free surface of lava and bubble bursting avalanches.

Keywords : bubble acoustic non-Newtonian fluid bursting





Author: Thibaut Divoux - Valérie Vidal - Francisco Melo - Jean-Christophe Géminard -

Source: https://hal.archives-ouvertes.fr/



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