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The study of phenomena that involve both thermodynamics and acoustics. A sound wave in a gas is usually regarded as consisting of coupled pressure...

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Figure 1.Acoustic resonance in a pulse combustor. The mass of gas in the tail pipe bounces against the “spring” of compressibility in the combustion zone, forming a resonant oscillator. The oscillations are driven by periodic, pressure-enhanced combustion.

From Encyclopedia article 'Thermoacoustics'

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Figure 2.An early standing-wave thermoacoustic refrigerator that cooled to -60°C (-76°F). Heat is carried up the temperature gradient in the stack. At the right is a magnified view of the oscillating motion of a typical parcel of gas. The volume of the parcel depends on its pressure and temperature. (After T. J. Hofler, Thermoacoustic Refrigerator Design and Performance, Ph.D. thesis, University of California at San Diego, 1996)

From Encyclopedia article 'Thermoacoustics'

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Figure 3.Thermoacoustic-Stirling hybrid engine. (a) A traveling wave runs clockwise around the toroidal loop. Its acoustic power is amplified in the regenerator, so that net power up to 1 kW (1.3 horsepower) can be extracted at the tee and delivered to a load. (b) Magnified view of the oscillating motion of a typical parcel of gas. (c) Thermodynamic cycle of the typical parcel of gas. (After S. Backhaus and G. Swift, Thermoacoustic-Stirling heat engine: Detailed study, J. Acous. Soc. Amer., 107:3148–3166, 2000)

From Encyclopedia article 'Thermoacoustics'

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