A Lagrangian variational formulation for nonequilibrium thermodynamics. Part I: Discrete systems

JOURNAL OF GEOMETRY AND PHYSICS

卷:111

Article

Gay-Balmaz, Francois¹  Yoshimura, Hiroaki² 

[1] Ecole Normale Super Paris, CNRS, LMD, IPSL, 24 Rue Lhomond, F-75005 Paris, France

[2] Waseda Univ, Sch Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan

关键词: Lagrangian formulation;    Nonequilibrium thermodynamics;    Variational formulation;    Nonholonomic constraints;    Irreversible processes;    Discrete systems;   

DOI  :  10.1016/j.geomphys.2016.08.018

来源: Elsevier

【 摘 要 】

In this paper, we present a Lagrangian variational formulation for nonequilibrium thermodynamics. This formulation is an extension of Hamilton's principle of classical mechanics that allows the inclusion of irreversible phenomena. The irreversibility is encoded into a nonlinear phenomenological constraint given by the expression of the entropy production associated to all the irreversible processes involved. From a mathematical point of view, our variational formulation may be regarded as a generalization to nonequilibrium thermodynamics of the Lagrange-d'Alembert principle used in nonlinear nonholonomic mechanics, where the conventional Lagrange-d'Alembert principle cannot be applied since the nonlinear phenomenological constraint and its associated variational constraint must be treated separately. In our approach, to deal with the nonlinear nonholonomic constraint, we introduce a variable called the thermodynamic displacement associated to each irreversible process. This allows us to systematically define the corresponding variational constraint. In Part I, our variational theory is illustrated with various examples of discrete systems such as mechanical systems with friction, matter transfer, electric circuits, chemical reactions, and diffusion across membranes. In Part II of the present paper, we will extend our variational formulation of discrete systems to the case of continuum systems. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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