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High Frequency Wave Propagation in a Strong-absorbing Fluid, Part II

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The classical expressions for sound speed c (ω)and coefficient of absorption α(ω)have been derived for ‘very small’ absorption. In the present paper wave propagation in relaxing fluid is studied under the assumption that viscosity, heat conduction and frequency are not small. Generalized equations for α and (ω) and c(ω) are proposed as the foundations for ‘nonlinear sonic spectroscopy’


Die klassischen Ausdrücke für die Schallgeschwindigkeit c ωund den Absorptionskoeffizienten α(ω)wurden für ,,sehr kleine“ Absorption abgeleitet. In der vorliegenden Arbeit wird die Wellenausbreitung in Fluiden mit Relaxation unter der Voraussetzung untersucht, daß die Viskosität, die Wärmeleitung und die Frequenz nicht klein sind. Es werden verallgemeinerte Gleichungen für αωund c(ω) vorgeschlagen als Grundlagen für eine ,,nichtlineare akustische Spektroskopie“


Les expressions classiques de la célérité acoustique c(ω)et du coefficient d'absorption α(ω)reposent sur l'hypothèse d'un fluide trés faiblement absorbant. Ici au contraire, on étudie le cas d'un fluide à relaxation dont on suppose que la viscosité et la conductibilité calorifique ne sont plus «petites», de même que la fréquence. Des équations généralisées pour α(ω)et c(ω)peuvent servir de base à une spectroscopie acoustique non-linéaire.
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Document Type: Research Article

Publication date: December 1, 1988

More about this publication?
  • 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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