Extended thermodynamics of real gases with dynamic pressure: An extension of Meixnerʼs theory

Basing on the recent theory of extended thermodynamics of dense gases, we study a thermodynamic theory of gases with the energy transfer from molecular translational mode to internal modes as an extension of Meixnerʼs theory. We focus our attention on the simplest case with only one dissipative process due to the dynamic pressure. The dispersion relation for sound derived from the present theory is compared with that from Meixnerʼs theory. Kinetic theoretical basis of the present approach is also discussed.

► Thermodynamic theory of gases with energy transfer from molecular translation mode to internal modes ► The macroscopic model extend the Euler fluid system taking into account the dynamical pressure. ► The model belong to Extended Thermodynamics of gas and fits with kinetic theory of polyatomic gases.