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Cavitation acoustique dans l'eau pure

Abstract : Any liquid can be superheated or stretched beyond its boiling curve. It will then remain in a metastable state, until a vapor bubble appears : this is the cavitation phenomenon. The study of the metastability limit gives information about the cohesion of the liquid and its equation of state. The case of water is of special interest ; indeed competiting theories predict qualitatively different temperature variations of the stability limit : either monotonic (the cavitation pressure increase with temperature), or with a minimum. We have stretched water with an ultrasonic wave, generated by a hemispherical piezoelectric ceramic, during a short time and a small volume, far from any wall, which reduces the effect of impurities. We obtain very accurate and reproducible results, allowing us to study in details the statistic of cavitation and to define a cavitation thresold. The ceramic was calibrated using two independent methods : needle hydrophones, and a method based on the variation of the static pressure. Both of them lead to the same result. We find a monotically increasing cavitation pressure, from -26 MPa at 0 Celsius C to -16 MPa at 80 Celsius C. These values are among the most negative reported, but far away from the values expected theoritically (-120 Mpa), and observed only once (Zheng etal , 1991, Science 254, 829). We discuss the possible origin of this discrepancy : it can be due either to the presence of impurities in the liquid, whose nature and concentration we discuss, or to an unexpected change in the equation of state of water at large negative pressures.
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Contributor : Herbert Éric <>
Submitted on : Friday, March 30, 2007 - 4:30:25 PM
Last modification on : Thursday, December 10, 2020 - 12:37:04 PM
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  • HAL Id : tel-00139435, version 1

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Éric Herbert. Cavitation acoustique dans l'eau pure. Analyse de données, Statistiques et Probabilités [physics.data-an]. Université Paris-Diderot - Paris VII, 2006. Français. ⟨tel-00139435⟩

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