The Hamilton Principle for Fluid Binary Mixtures with two Temperatures

Gouin, Henri ; Ruggeri, Tommaso

Bollettino della Unione matematica italiana, Série 9, Tome 2 (2009) no. 2, pp. 403-422.

Résumé

For binary mixtures of fluids without chemical reactions, but with components having different temperatures, the Hamilton principle of least action is able to produce the equation of motion for each component and a balance equation of the total heat exchange between components. In this nonconservative case, a Gibbs dynamical identity connecting the equations of momenta, masses, energy and heat exchange allows to deduce the balance equation of energy of the mixture. Due to the unknown exchange of heat between components, the number of obtained equations is less than the number of field variables. The second law of thermodynamics constrains the possible expression of a supplementary constitutive equation closing the system of equations. The exchange of energy between components produces an increasing rate of entropy and creates a dynamical pressure term associated with the difference of temperature between components. This new dynamical pressure term fits with the results obtained by classical thermodynamical arguments in [1] and confirms that the Hamilton principle can afford to obtain the equations of motions for multi-temperature mixtures of fluids.

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