Archives of Acoustics, 15, 3-4, pp. 301-310, 1990

Velocity dispersion and attenuation of acoustic waves in critical mixturcs

T. Hornowski
Institute of Acoustics Adam Mickiewicz University, 00- 769 Poznań, ul. Matejki 48/49
Poland

M. Łabowski
Institute of Acoustics Adam Mickiewicz University, 00- 769 Poznań, ul. Matejki 48/49
Poland

Theoretical considerations on critical ultrasonic dispersion and attenuation in binary liquid mixtures based on the mode-coupling approach and frequency-dependent heat capacity are presented. A general expression for the critical amplitude A (T) in terms of the parameter d = (ρc /Tp) . (dT/dP) is derived. It is shown that for specific values of d one obtains expressions for A (T) equivalent to those of Fixman, Kawasaki, Mistura and Chaban. Moreover, an experimental test has been carried out on the system met-hanol-n-hexane showing good agreement between our general expression for A (T) and experimental data.
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