R. Raspet et al., The effect of evaporation-condensation on sound propagation in cylindricaltubes using the low reduced frequency approximation, J ACOUST SO, 105(1), 1999, pp. 65-73
In order to better understand the effects of water on sound attenuation in
porous materials, Mao [J. Acoust. Soc. Am. 104, 664-670 (1998)] has investi
gated sound propagation in a gas-water vapor mixture contained in a cylindr
ical tube. He used the Rayleigh eigenmode calculation to evaluate the high
and low frequency limits of attenuation in an air-filled tube with wet wall
s. However, he was unable to obtain a general analytical expression and the
interpretation of the limits is difficult because of their complexity. The
formulation of the problem presented in this paper parallels the ''low red
uced frequency method'' of Tijdeman [J. Sound Vib. 39, 1-33 (1975)]. In con
trast to the earlier results, an analytical solution for the propagation co
nstant is obtained which allows for calculation of attenuation over a broad
frequency range. The simple expressions obtained in the small and large sh
ear wave number limits provide useful insight into the behavior of the gas-
water vapor mixture. (C) 1999 Acoustical Society of America. [S0001-4966(99
)02901-X].