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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
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Published on: November 29, 2013

Heat transport in active harmonic chains.

Mei C Zheng1, Fred M Ellis, Tsampikos Kottos

  • 1Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 21, 2011
PubMed
Summary

This study reveals novel heat transport in a harmonic lattice model with amplifying and attenuating elements. PT-symmetric arrangements maximize unique steady-state heat currents and nonreciprocal transport.

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Area of Science:

  • Condensed matter physics
  • Thermodynamics
  • Nonlinear dynamics

Background:

  • Understanding heat transport in complex systems is crucial.
  • Lattice models provide a framework for studying thermal properties.
  • Non-equilibrium steady states present unique physical phenomena.

Purpose of the Study:

  • To investigate heat transport properties of a harmonic lattice model with active elements.
  • To explore anomalous heat currents, negative differential thermal conductance, and nonreciprocal transport.
  • To analyze the effect of PT-symmetric arrangements on steady-state properties.

Main Methods:

  • Development of a harmonic lattice model incorporating amplifying and attenuating elements.
  • Coupling the lattice model to two thermal baths to establish non-equilibrium conditions.
  • Analysis of heat currents, thermal conductance, and transport properties under varying conditions.
  • Investigation of PT-symmetric configurations within the lattice model.

Main Results:

  • Observed anomalous non-equilibrium steady-state heat currents.
  • Demonstrated negative differential thermal conductance.
  • Revealed nonreciprocal heat transport phenomena.
  • Found that PT-symmetric arrangements maximize the domain of existence for non-equilibrium steady states.

Conclusions:

  • The harmonic lattice model with active elements exhibits unique and tunable heat transport.
  • PT-symmetry plays a critical role in enhancing and stabilizing non-equilibrium steady states.
  • The proposed electronic experimental setup using RLC transmission lines offers a viable platform for validating these findings.