Determination of the growth rate of instability of low velocity free falling jets

An imaging technique with asymmetric magnification is used to visualize liquid cylindrical jet interface displacements. The wavelet transform technique is applied to the jet interface to localize the perturbations. Scale parameters of the perturbation waves are obtained by a recognition technique. W...

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Bibliographic Details
Published in:Experiments in fluids 2000-09, Vol.29 (3), p.247-256
Main Authors: BLAISOT, J. B, ADELINE, S
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Hydrodynamic stability
Instrumentation for fluid dynamics
Physics
Surface-tension-driven instability
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Summary:An imaging technique with asymmetric magnification is used to visualize liquid cylindrical jet interface displacements. The wavelet transform technique is applied to the jet interface to localize the perturbations. Scale parameters of the perturbation waves are obtained by a recognition technique. Wave numbers and growth rates are determined for free falling jets. The most representative growth rate of perturbation is measured by a statistical analysis as well as the wavenumber and the initial amplitude of perturbation eta0. The concordance between the appearance of a critical velocity in the stability curve and a minimum in the growth rate is shown. Important variations of eta0 was also measured in a flow regime where it is usually supposed to be constant. (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/s003489900081