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Fluid-fluid interfaces of multi-component mixtures in local equilibrium

Entropy, ISSN: 1099-4300, Vol: 20, Issue: 4
2018
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Entropy, Vol. 20, Pages 250: Fluid-Fluid Interfaces of Multi-Component Mixtures in Local Equilibrium

Entropy, Vol. 20, Pages 250: Fluid-Fluid Interfaces of Multi-Component Mixtures in Local Equilibrium Entropy doi: 10.3390/e20040250 Authors: Dick Bedeaux Signe Kjelstrup We derive in a

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We derive in a new way that the intensive properties of a fluid-fluid Gibbs interface are independent of the location of the dividing surface. When the system is out of global equilibrium, this finding is not trivial: In a one-component fluid, it can be used to obtain the interface temperature from the surface tension. In other words, the surface equation of state can serve as a thermometer for the liquid-vapor interface in a one-component fluid. In a multi-component fluid, one needs the surface tension and the relative adsorptions to obtain the interface temperature and chemical potentials. A consistent set of thermodynamic properties of multi-component surfaces are presented. They can be used to construct fluid-fluid boundary conditions during transport. These boundary conditions have a bearing on all thermodynamic modeling on transport related to phase transitions.

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