Observations of Kelvin-Helmholtz instability at the air-water interface in a circular domain
- 1 March 2012
- journal article
- research article
- Published by AIP Publishing in Physics of Fluids
- Vol. 24 (3)
- https://doi.org/10.1063/1.3697487
Abstract
We present an analysis of Kelvin-Helmholtz instability in a circular domain in the limit of the azimuthal integer wavenumber, n → ∞ which reproduces the classical results for a rectilinear geometry at the rim, provided that the additional condition that the surface current to surface wind ratio is (ρ1/ρ2)1/2 where ρ1 and ρ2 are respectively the densities of air and water, is satisfied. Experiments were carried out in a circular rig of radius 0.19 m in which a family of unstable waveforms with n ≈ 60 were observed with properties (including the additional condition) in approximate agreement with theory. The additional condition is consistent with the absence of a surface shear stress in the instability process.Keywords
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