Breakdown of the homogeneity of weakly conducting liquids in high electric fields |
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Authors: | Yu K Stishkov A V Steblyanko |
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Institution: | (1) Scientific-Research Institute of Radio Physics, St. Petersburg State University, 198904 St. Petersburg, Russia |
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Abstract: | A study of the structure of electrohydrodynamic flows shows that the electric charge carriers are ions that are practically
frozen into the surrounding liquid. In other words, ions in weakly conducting liquids are capable of forming more or less
stable structures whose viscoelastic properties are different from those of an uncharged liquid. One method of studying this
effect is to investigate the velocity dispersion of ultrasound on charged supermolecular formations. The results of theoretical
and experimental investigations of acoustic dispersion in liquid dielectrics subjected to prebreakdown electric fields are
presented. A model problem of sound propagation in a liquid in which supermolecular structures have formed around elementary
charge carriers is studied theoretically. Approximate formulas describing the dispersion of the acoustic phase velocity as
a function of the electric field parameters and the electrophysical parameters of the liquid are obtained. The frequency dependence
of the sound velocity is of a resonance character, the resonance frequency being determined by the electric charge density
and the mass of the charged supermolecular structures. The experiments showed that the space charge affects the velocity of
acoustic waves in liquid dielectrics.
Zh. Tekh. Fiz. 67, 105–111 (October 1997) |
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Keywords: | |
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