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Simpler free-energy functional of the Debye-Hückel model of fluids and the nonuniqueness of free-energy functionals in the theory of fluids

R. Piron 1 T. Blenski 2
2 MHDE - Matière à Haute Densité d'Energie
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
Abstract : In previous publications [Piron and Blenski, Phys. Rev. E 94, 062128 (2016); Blenski and Piron, High Energy Density Phys. 24, 28 (2017)], the authors have proposed Debye-Hückel-approximate free-energy functionals of the pair distribution functions for one-component fluids and two-component plasmas. These functionals yield the corresponding Debye-Hückel integral equations when they are minimized with respect to the pair distribution functions, lead to correct thermodynamic relations, and fulfill the virial theorem. In the present paper, we update our results by providing simpler functionals that have the same properties. We relate these functionals to the approaches of Lado [Phys. Rev. A 8, 2548 (1973)] and of Olivares and McQuarrie [J. Chem. Phys. 65, 3604 (1976)]. We also discuss briefly the nonuniqueness issue that is raised by these results.
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Submitted on : Thursday, June 20, 2019 - 10:53:09 AM
Last modification on : Monday, February 10, 2020 - 6:14:03 PM

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R. Piron, T. Blenski. Simpler free-energy functional of the Debye-Hückel model of fluids and the nonuniqueness of free-energy functionals in the theory of fluids. Physical Review E , American Physical Society (APS), 2019, 99 (5), ⟨10.1103/PhysRevE.99.052134⟩. ⟨cea-02160870⟩

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