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Issue 20, 2016
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Heat transport through a solid–solid junction: the interface as an autonomous thermodynamic system

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Abstract

We perform computational experiments using nonequilibrium molecular dynamics simulations, showing that the interface between two solid materials can be described as an autonomous thermodynamic system. We verify the local equilibrium and give support to the Gibbs description of the interface also away from the global equilibrium. In doing so, we reconcile the common formulation of the thermal boundary resistance as the ratio between the temperature discontinuity at the interface and the heat flux with a more rigorous derivation from nonequilibrium thermodynamics. We also show that thermal boundary resistance of a junction between two pure solid materials can be regarded as an interface property, depending solely on the interface temperature, as implicitly assumed in some widely used continuum models, such as the acoustic mismatch model. Thermal rectification can be understood on the basis of different interface temperatures for the two flow directions.

Graphical abstract: Heat transport through a solid–solid junction: the interface as an autonomous thermodynamic system

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Publication details

The article was received on 20 Mar 2016, accepted on 25 Apr 2016 and first published on 26 Apr 2016


Article type: Communication
DOI: 10.1039/C6CP01872F
Citation: Phys. Chem. Chem. Phys., 2016,18, 13741-13745
  • Open access: Creative Commons BY license
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    Heat transport through a solid–solid junction: the interface as an autonomous thermodynamic system

    R. Rurali, L. Colombo, X. Cartoixà, Ø. Wilhelmsen, T. T. Trinh, D. Bedeaux and S. Kjelstrup, Phys. Chem. Chem. Phys., 2016, 18, 13741
    DOI: 10.1039/C6CP01872F

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