Assuming linear relations between the thermodynamic fluxes and the thermodynamic forces derived in Chap. 7, in this chapter we apply Onsager’s reciprocal relations to determine the most general symmetry conditions that are satisfied by the phenomenological coefficients (Sects. 8.1 and 8.2). Then, in Sect. 8.3, these conditions are applied to particular cases, obtaining the constitutive relations of pure fluids, multicomponent mixtures, metals and non-isotropic media. Finally, in Sect. 8.4, we see how these same symmetry conditions can be applied to find the cross correlation properties of the fluctuating thermodynamic fluxes.
KeywordsConstitutive Relation Thermodynamic Force Entropy Production Rate Phenomenological Equation Phenomenological Coefficient
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