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Related Experiment Videos

Nonlinear natural engine: Model for thermodynamic processes in mesoscale systems.

J Wheatley1, D S Buchanan, G W Swift

  • 1Condensed Matter and Thermal Physics, K764, Los Alamos National Laboratory, Los Alamos, NM 87545.

Proceedings of the National Academy of Sciences of the United States of America
|December 1, 1985
PubMed
Summary

Researchers created a model thermoacoustic heat engine using nonlinear acoustic vibrators. This system demonstrates localized states that pump heat, offering insights into mesoscale systems and thermodynamic heat engines.

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Area of Science:

  • Thermodynamics
  • Acoustics
  • Nonlinear Dynamics

Background:

  • Thermodynamic heat engines offer a framework for energy conversion.
  • Mesoscale systems present unique challenges for energy transfer and management.
  • Understanding nonlinear phenomena is crucial for advanced energy systems.

Purpose of the Study:

  • To explore the application of thermodynamic heat engine concepts to mesoscale systems.
  • To construct and analyze a model thermoacoustic heat engine.
  • To investigate the emergence of localized states in nonlinear acoustic systems.

Main Methods:

  • Acoustic vibrator chain model with argon gas and solid boundaries.
  • Nonlinear Helmholtz resonators with flexible Kapton film and oil.

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  • Driving the system below resonance at high amplitude to induce localized states.

    • Main Results:

    • Stationary localized (solitary) states formed irreversibly in the acoustic chain.
    • These states exhibited higher vibrational amplitude and deep subharmonics.
    • Heat was observed to be pumped towards these localized states.

    Conclusions:

    • The model demonstrates heat pumping in localized states, analogous to heat engines.
    • Findings suggest potential applications for mesoscale systems with molecular vibrators.
    • Nonlinear acoustics provides a viable approach for studying energy transfer in mesoscale phenomena.