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- Title
Precursors in gas-liquid mixtures.
- Authors
Gasenko, V.; Gorelik, R.; Nakoryakov, V.; Timkin, L.
- Abstract
Two types of precursors propagating at the speed of sound in a pure liquid have been revealed in the experiments on the evolution of pressure pulses in a gas-liquid mixture; at the same time, the main pressure pulse propagates at a low equilibrium speed of sound and its evolution is described by the Burgers-Korteweg-de Vries equation. The first high-frequency precursor is a complete analog of a classical Sommerfeld precursor, because the resonance dispersion equation for a bubble mixture coincides with that for insulators in the Lorentz model, and oscillates at a frequency close to the 'plasma frequency.' The second low-frequency precursor has been revealed in this work. The frequency of the low-frequency precursor is close to the resonance frequency of pulsations of bubbles, which is almost an order of magnitude lower than the frequency of the high-frequency precursor. The low-frequency precursor has a much larger amplitude of pulsations and smaller damping and is not described within the homogeneous model of the gas-liquid mixture. The observed phenomenon of low-frequency precursors has been explained within a simple heterogeneous model of a bubble liquid.
- Subjects
CHEMICAL precursors; GAS-liquid interfaces; GAS mixtures; PHYSICS experiments; BUBBLES; KORTEWEG-de Vries equation
- Publication
JETP Letters, 2013, Vol 98, Issue 4, p195
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364013170049