Oscillating thermal diffusion in a sound wave in a mixture of two gases is remarkably effective for separating the components of the mixture. We consider this separation process in boundary-layer approximation, with zero temperature gradient and zero concentration gradient along the direction of sound propagation. In the boundary layer, the combination of thermal diffusion with the oscillating temperature gradient and oscillating velocity gradient leads to second-order time-averaged fluxes of the two components of the mixture in opposite directions, parallel to the wave-propagation direction. The oscillating thermal diffusion also adds to the dissipation of acoustic power in the boundary layer, modifying thermal-relaxation dissipation but leaving viscous dissipation unchanged.
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October 1999
October 01 1999
Thermal diffusion and mixture separation in the acoustic boundary layer
G. W. Swift;
G. W. Swift
Condensed Matter and Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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P. S. Spoor
P. S. Spoor
Condensed Matter and Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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J. Acoust. Soc. Am. 106, 1794–1800 (1999)
Article history
Received:
February 11 1999
Accepted:
June 25 1999
Connected Content
A correction has been published:
Erratum: “Thermal diffusion and mixture separation in the acoustic boundary layer” [J. Acoust. Soc. Am. 106, 1794–1800 (1999)]
A correction has been published:
Erratum: “Thermal diffusion and mixture separation in the acoustic boundary layer” [J. Acoust. Soc. Am. 106, 1794–1800 (1999)]
Citation
G. W. Swift, P. S. Spoor; Thermal diffusion and mixture separation in the acoustic boundary layer. J. Acoust. Soc. Am. 1 October 1999; 106 (4): 1794–1800. https://doi.org/10.1121/1.427929
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