ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Biot's theory [J. Acoust. Soc. Am. 28, 168 (1956)] is investigated by the finite-element method at ultrasonic frequencies. The numerical results for an acoustic/poroelastic/acoustic system are presented by using the double-node layers technique of Teng and Kuo [Comput. Acoust. Int. Assoc. Mathe. Comput. Simul., 239 (1988)]. This work is motivated by the work of Plona [Appl. Phys. Lett. 36, 259 (1980], Johnson [Appl. Phys. Lett. 37, 1065 (1980)], and Johnson and Plona [J. Acoust. Soc. Am. 72, 556 (1982)], in which they have experimentally and analytically investigated the problem of wave propagation in a fluid/fluid-saturated-porous-solid/fluid system and fourth sound in a porous "superleak'' saturated with superfluid helium. Given suitable physical parameters in the finite-element calculations, if the open-boundary conditions at the fluid/porous-solid interfaces are used, excellent agreement with Plona's measurements has been obtained. The finite-element results with the sealed interfaces for the same model, showing a diminishing of the second type of compressional wave, also agree with the experimental work performed by Rasolofosaon [Appl. Phys. Lett. 52, 780 (1988)].
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.346207
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