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Accueil du site > Séminaires > Archives séminaires > Séminaires 2010 > Séminaire MSC 27 sept. 2010 à 11h30. Masao Doi (Univ. Tokyo) : "Onsager’s variational principles in soft matter physics".

Séminaire MSC 27 sept. 2010 à 11h30. Masao Doi (Univ. Tokyo) : "Onsager’s variational principles in soft matter physics"

Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.


In soft matter physics, many phenomenological equations are known which describe the complex behavior of the system in non-equilibrium state. Examples are (i) nemato-hydrodynamics: the equations describing the director field and the velocity field, and (ii) kinetic equation for electrolyte solutions which describe the time evolution of ion-concentration, electric field, and solvent flow etc and (iii) the gel dynamics: the coupled equation for the permeation of solvent and the deformation of gel. Here I would like to show that these equations can be derived from a variational principle which I shall call Onsager’s variational principle. The variational principle is a simple rewriting of the conventional thermodynamics of irreversible processes, but it is quite convenient since it allows a great flexibility in choosing the state variable and guarantees the Onsager’s reciprocal relation in the final equation.


Contact : Équipe séminaires / Seminar team - Published on / Publié le 21 septembre 2010