Abstract
A dispersion relation is derived for capillary waves with arbitrary symmetry (with arbitrary azimuthal numbers) on the surface of a jet of an ideal incompressible dielectric liquid moving in an ideal incompressible dielectric medium along an external uniform electrostatic field. A tangential discontinuity in the velocity field on the jet surface is shown to cause Kelvin-Helmholtz periodical instability at the interface and destabilize axisymmetric, flexural, and flexural-deformational waves. Both the flexural and flexural-deformational instabilities have a threshold and are observed not at an arbitrarily small velocity of the jet but starting from a certain finite value. It is shown that the instability of waves generated by the tangential discontinuity of the velocity field is periodic only formally (from the pure mathematical point of view). Actually, the jet disintegrates within the time of instability development, which is shorter than the half-cycle of the wave.
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Original Russian Text © A.I. Grigor’ev, S.O. Shiryaeva, N.A. Polyantsev, 2011, published in Zhurnal Tekhnicheskoi Fiziki, 2011, Vol. 81, No. 12, pp. 56–62.
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Grigor’ev, A.I., Shiryaeva, S.O. & Polyantsev, N.A. On the stability of a cylindrical jet moving in a material medium along an external electrostatic field. Tech. Phys. 56, 1754–1760 (2011). https://doi.org/10.1134/S1063784211120061
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DOI: https://doi.org/10.1134/S1063784211120061