Growth rate measurement in free jet experiments

Abstract : An experimental method was developed to measure the growth rate of the capillary instability for free liquid jets. The method uses a standard shadow-graph imaging technique to visualize a jet, produced by extruding a liquid through a circular orifice, and a statistical analysis of the entire jet. The analysis relies on the computation of the standard deviation of a set of jet profiles, obtained in the same experimental conditions. The principle and robustness of the method are illustrated with a set of emulated jet profiles. The method is also applied to free falling jet experiments conducted for various Weber numbers and two low-viscosity solutions: a Newtonian and a viscoelastic one. Growth rate measurements are found in good agreement with linear stability theory in the Rayleigh's regime, as expected from previous studies. In addition, the standard deviation curve is used to obtain an indirect measurement of the initial perturbation amplitude and to identify beads on a string structure on the jet. This last result serves to demonstrate the capability of the present technique to explore in the future the dynamics of viscoelastic liquid jets.
Type de document :
Article dans une revue
Experiments in Fluids, Springer Verlag (Germany), 2017, 58 (7), pp.89. 〈10.1007/s00348-017-2374-2〉
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https://hal.archives-ouvertes.fr/hal-01611189
Contributeur : Alexandre Poux <>
Soumis le : jeudi 5 octobre 2017 - 15:35:26
Dernière modification le : mercredi 21 novembre 2018 - 01:20:26

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Jean-Baptiste Charpentier, Marie-Charlotte Renoult, Olivier Crumeyrolle, Innocent Mutabazi. Growth rate measurement in free jet experiments. Experiments in Fluids, Springer Verlag (Germany), 2017, 58 (7), pp.89. 〈10.1007/s00348-017-2374-2〉. 〈hal-01611189〉

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