Detail calculations of the excess entropy of a ternary mixture in terms of excess pressure and density are carried out with accuracy up to quadratic non-linear terms. The only assumption is that the vapour and the neutral gas are ideal gases. As an example, a ternary mixture consisting
of air and water being in equilibrium with its vapour is considered. Finally, the small-signal sound velocity and the parameter of non-linearity B/A are expressed in terms of mass concentrations of air and vapour and air pressure. Illustrations of sound velocity reveal divergence with previous
theories. Calculations of the parameter of non-linearity B/A show that it increases with vapour mass concentration and that it decreases when air partial pressure increases.
Document Type: Research Article
Publication date: September 1, 2005
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.