Per citar aquest document: http://ddd.uab.cat/record/118204
Diffuse-interface model for rapid phase transformations in nonequilibrium systems
Galenko, Peter (Institut für Raumsimulation (Colònia, Alemanya))
Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física)

Data: 2005
Resum: A thermodynamic approach to rapid phase transformations within a diffuse interface in a binary system is developed. Assuming an extended set of independent thermodynamic variables formed by the union of the classic set of slow variables and the space of fast variables, we introduce finiteness of the heat and solute diffusive propagation at the finite speed of the interface advancing. To describe transformations within the diffuse interface, we use the phase-field model which allows us to follow steep but smooth changes of phase within the width of the diffuse interface. Governing equations of the phase-field model are derived for the hyperbolic model, a model with memory, and a model of nonlinear evolution of transformation within the diffuse interface. The consistency of the model is proved by the verification of the validity of the condition of positive entropy production and by outcomes of the fluctuation-dissipation theorem. A comparison with existing sharp-interface and diffuse-interface versions of the model is given.
Drets: Tots els drets reservats.
Llengua: Anglès.
Document: article ; recerca ; publishedVersion
Publicat a: Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 71, Number 4 (April 2005) , p. 046125/1-046125/13, ISSN 1539-3755

DOI: 10.1103/PhysRevE.71.046125


13 p, 128.4 KB

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