Nonequilibrium thermodynamics of an interface.
- Schweizer M Department of Materials, ETH Zürich, CH-8093 Zürich, Switzerland.
- Öttinger HC Department of Materials, ETH Zürich, CH-8093 Zürich, Switzerland.
- Savin T Department of Materials, ETH Zürich, CH-8093 Zürich, Switzerland.
- 2016-06-15
Published in:
- Physical review. E. - 2016
English
Interfacial thermodynamics has deep ramifications in understanding the boundary conditions of transport theories. We present a formulation of local equilibrium for interfaces that extends the thermodynamics of the "dividing surface," as introduced by Gibbs, to nonequilibrium settings such as evaporation or condensation. By identifying the precise position of the dividing surface in the interfacial region with a gauge degree of freedom, we exploit gauge-invariance requirements to consistently define the intensive variables for the interface. The model is verified under stringent conditions by employing high-precision nonequilibrium molecular-dynamics simulations of a coexisting vapor-liquid Lennard-Jones fluid. We conclude that the interfacial temperature is determined using the surface tension as a "thermometer," and it can be significantly different from the temperatures of the adjacent phases. Our findings lay foundations for nonequilibrium interfacial thermodynamics.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevE.93.052803
- PMID 27300960
- Persistent URL
- https://sonar.ch/global/documents/267387
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