Abstract
Characterization of the Acoustic Properties of Random Porous Media: Reticulated Vitreous Carbon and Aluminum Foam Heui-Seol Roh Davidson Laboratory, Stevens Institute of Technology, Hoboken, New Jersey 07030, U.S.A. (Received 21 March 2008) The acoustic properties of thermoacoustic stacks made from random porous media are experimentally investigated using a hybrid two-microphone impedance method and a lumped-element technique. A two-microphone impedance tube is used to measure the speci c acoustic impedance (SAI) of random porous reticulated vitreous carbon (RVC) and aluminum foam. The lumpedelement technique is then used to determine the experimentally derived thermoviscous functions, which produce the propagation constant and the characteristic impedance. The measured acoustic properties of the stacks are compared to calculated results obtained by assuming parallel, capillary tubes. These comparisons verify that the hybrid impedance measurement can provide useful acoustic properties and that the parallel capillary-tube-based thermoacoustic theory is valuable in predicting the acoustic properties of random porous media. PACS numbers: 43.35.Ud, 43.28.Kt, 43.20.Mv
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