The theory for thermoacoustic mixture separation is extended to include the effects of a nonzero concentration gradient. New data are presented, which are in excellent agreement with this theory. The maximum concentration gradient which may be achieved in a binary mixture of gases through this separation process is intrinsically limited by the fractional pressure amplitude, by the tidal displacement, and by the size of the thermal diffusion ratio. Ordinary diffusion further detracts from the attainable final concentration gradient and can become the dominant remixing process as the cross section of the duct is increased. Rayleigh streaming also works against thermoacoustic separation, and an estimate of the molar flux from streaming is given.
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April 2002
April 03 2002
Saturation of thermoacoustic mixture separation
D. A. Geller;
D. A. Geller
Condensed Matter and Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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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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J. Acoust. Soc. Am. 111, 1675–1684 (2002)
Article history
Received:
January 19 2001
Accepted:
December 17 2001
Citation
D. A. Geller, G. W. Swift; Saturation of thermoacoustic mixture separation. J. Acoust. Soc. Am. 1 April 2002; 111 (4): 1675–1684. https://doi.org/10.1121/1.1453449
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