Thermoacoustics in irregular media.

Abstract

One approach to acoustics in random porous media is to use fitting parameters to match theoretical models derived from exact parallel pore theory to measured values of the media’s acoustic properties such as the complex compressibility and complex density. [Roh et al. J. Acoust. Soc. Am., 121, 1413–1422 (2007)] extended these ideas to the more complicated thermoacoustic case of an applied temperature gradient by using empirical factors to reshape the known solution for thermoacoustics in a regular framework of rigid tubes to RVC and aluminum foam samples. The validity of this model has been investigated by directly simulating the sound propagation through several irregular, 3-D geometries using a thermal fluid solver. The acoustic and thermoacoustic simulation results for several geometries will be presented and compared to the theoretical results.