Thermodynamical mode selection rule observed in thermoacoustic oscillations
Department of Crystalline Materials Science,
Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2 Department of Physics, Aichi University of Education Kariya, 448-8542, Japan
Accepted: 12 August 2002
A gas column in a tube with a temperature gradient spontaneously begins to oscillate when it is driven away from equilibrium. We observed a transition from the standing- to the traveling-acoustic-wave modes through a quasiperiodic state using a looped tube attached to a resonator. Through the measurements of entropy flow, we experimentally propose a thermodynamical mode selection rule, which acts as a guiding principle for a sequence of unstable modes appearing in nonequilibrium systems.
PACS: 43.35.Ud – Thermoacoustics, high temperature acoustics, photoacoustic effect / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EDP Sciences, 2002