A RELAXATION MODEL FOR LIQUID-VAPOR PHASE CHANGE WITH METASTABILITY

Abstract : We propose a model that describes phase transition including metastable states present in the van der Waals Equation of State. From a convex optimization problem on the Helmoltz free energy of a mixture, we deduce a dynamical system that is able to depict the mass transfer between two phases, for which equilibrium states are either metastable states, stable states or a coexistent state. The dynamical system is then used as a relaxation source term in an isothermal 4×4 two-phase model. We use a Finite Volume scheme that treats the convective part and the source term in a fractional step way. Numerical results illustrate the ability of the model to capture phase transition and metastable states.
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Communications in Mathematical Sciences, International Press, 2016, 74 (8), pp.2179-2214. 〈10.4310/CMS.2016.v14.n8.a4〉
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Francois James, Hélène Mathis. A RELAXATION MODEL FOR LIQUID-VAPOR PHASE CHANGE WITH METASTABILITY. Communications in Mathematical Sciences, International Press, 2016, 74 (8), pp.2179-2214. 〈10.4310/CMS.2016.v14.n8.a4〉. 〈hal-01178947v2〉

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