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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|
|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|
|PDF version:||Click here to retrieve PDF version of paper (256KB)|