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Publication Citation: Bulk Viscosity, Thermoacoustic Boundary Layers, and Adsorption Near the Critical Point

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Author(s): Keith A. Gillis; Iosif I. Shinder; Michael R. Moldover;
Title: Bulk Viscosity, Thermoacoustic Boundary Layers, and Adsorption Near the Critical Point
Published: September 08, 2006
Abstract: We measured the resonance spectrum of an acoustic resonator filled with xenon near its critical temperature Tc. We reduced the effect of gravity on the xenon by convective stirring to achieve a temperature resolution of (T-Tc)/Tc 7 10-6. The data yield accurate values of xenon s speed of sound, acoustic dissipation, and thermal conductivity. Linear acoustics, including the frequency-dependent bulk viscosity from renormalization-group theory, predicts the dissipation within the thermoacoustic boundary layer peaks at characteristic temperatures. The peak was not observed. We show that critical-point adsorption is one mechanism that can suppress the peak.
Citation: Physical Review Letters
Volume: 97
Issue: 10
Pages: pp. 104502-1 - 104502-4
Keywords: acoustic resonators;adsorption;attenuation;bulk viscosity;convection;critical point;speed of sound;thermoacoustic boundary layer;ultrasonics xenon
Research Areas: Critical Phenomena, Fluids, Thermophysics
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