Onsager-Parodi relation

Parodi obtained the following relation (1970) according to the Onsager reciprocal relation... 

It is well known that Truesdell is of the view that Onsager s relations do not apply to phenomena like heat conduction, viscosity and diffusion since there is no unambiguous way of selecting the fluxes and forces. It would appear therefore that there may be some doubts as to the validity of Parodi s relation. Available data indicate that (3.1.39) is satisfied within experimental limits, but, in any case, the relation has been tadtly assumed to be true in most discussions. 

By invoking Onsager relations, Parodi [48] argues that one restrict the viscous coefficients to satisfy the relationship... 

By appeal to Onsager relations, Parodi [10] proposed that the viscosity coefficients are restricted by... 

Parodi [217] proposed, via Onsager relations, that the viscosity coeflScients should be further restricted by the relation... 

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