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

Published

September 8, 2006

Author(s)

Keith A. Gillis, Iosif I. Shinder, Michael R. Moldover

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

Pub Type

Journals

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Keywords

acoustic resonators, adsorption, attenuation, bulk viscosity, convection, critical point, speed of sound, thermoacoustic boundary layer, ultrasonics xenon

Citation

Gillis, K. , Shinder, I. and Moldover, M. (2006), Bulk Viscosity, Thermoacoustic Boundary Layers, and Adsorption Near the Critical Point, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830964 (Accessed April 19, 2024)