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Evolution and breaking of parametrically forced capillary waves in a circular cylinder

Published online by Cambridge University Press:  25 August 2009

BABURAJ A. PUTHENVEETTIL  and
E. J. HOPFINGER
BABURAJ A. PUTHENVEETTIL*
Affiliation:
Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai-600 036, India
E. J. HOPFINGER
Affiliation:
LEGI-CNRS-UJF, BP 53, 38041 Grenoble Cedex 9, France
*
†Email address for correspondence: [email protected]
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Abstract

We present results on parametrically forced capillary waves in a circular cylinder, obtained in the limit of large fluid depth, using two low-viscosity liquids whose surface tensions differ by an order of magnitude. The evolution of the wave patterns from the instability to the wave-breaking threshold is investigated in a forcing frequency range (f = ω/2π = 25–100 Hz) that is around the crossover frequency (ωot) from gravity to capillary waves (ωot/2≤ω/2≤4ωot). As expected, near the instability threshold the wave pattern depends on the container geometry, but as the forcing amplitude is increased the wave pattern becomes random, and the wall effects are insignificant. Near breaking, the distribution of random wavelengths can be fitted by a Gaussian. A new gravity–capillary scaling is introduced that is more appropriate, than the usual viscous scaling, for low-viscosity fluids and forcing frequencies <103 Hz. In terms of these scales, a criterion is derived to predict the crossover from capillary- to gravity-dominated breaking. A wave-breaking model is developed that gives the relation between the container and the wave accelerations in agreement with experiments. The measured drop size distribution of the ejected drops above the breaking threshold is well approximated by a gamma distribution. The mean drop diameter is proportional to the wavelength determined from the dispersion relation; this wavelength is also close to the most likely wavelength of the random waves at drop ejection. The dimensionless drop ejection rate is shown to have a cubic power law dependence on the dimensionless excess acceleration ε′d an inertial–gravitational ligament formation model is consistent with such a power law.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 633 , 25 August 2009 , pp. 355 - 379
Copyright
Copyright © Cambridge University Press 2009

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