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Coherent Mechanism of Sound Generation in Vapour Condensation

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A three-phase medium is considered which consists of vapour, gas and liquid drops. The system is in a nonequilibrium state when the vapour density is larger than the density of the saturated vapours. Under these conditions the condensation is more intensive than the evaporation and heat isolated in the system. It is shown that coherent sound amplification is possible in the given nonequilibrium medium. Formulae have been derived for the instability increments from which it follows that low-frequency acoustic oscillations are unstable. The upper frequency limitation is due to the finiteness of the heat transfer rate from the liquid drops to the gas. The physical interpretation of the results is given. Estimations are presented for real atmospheric conditions which demonstrate the efficiency of the considered mechanism of sound generation.
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Document Type: Research Article

Publication date: January 1, 1996

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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