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Volume 115, Issue 6, June 2004
- SPEECH PROCESSING AND COMMUNICATION SYSTEMS 
115(2004); http://dx.doi.org/10.1121/1.1738686View Description Hide Description
The modeling of viscous losses in acoustic wave transmission through tubes by a boundary layer approximation is valid if the thickness of the boundary layer is small compared to the hydraulic radius. A method was found to describe the viscous losses that extends the frequency range of the model to very low frequencies and very thin tubes. For higher frequencies, this method includes asymptotically the spectral effects of the boundary layer approximation. The method provides a simplification for the rational approximation of the spectral effects of viscous losses.