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Stirling engine
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=== Thermoacoustic cycle === Thermoacoustic devices are very different from Stirling devices, although the individual path travelled by each working gas molecule does follow a real [[Stirling cycle]]. These devices include the [[Thermoacoustic hot air engine|thermoacoustic engine]] and [[Thermoacoustic refrigeration|thermoacoustic refrigerator]]. High-amplitude acoustic [[standing wave]]s cause compression and expansion analogous to a Stirling power piston, while out-of-phase acoustic [[travelling wave]]s cause displacement along a temperature [[gradient]], analogous to a Stirling displacer piston. Thus a thermoacoustic device typically does not have a displacer, as found in a beta or gamma Stirling.{{citation needed|date=July 2020}}
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