Wave features for consistent-order-extended thermodynamics

Linear and nonlinear waves propagating in a heat conductive gas described by Consistent-Order-Extended Thermodynamics of third order are studied. Firstly, the propagation of plane harmonic waves are analyzed and the frequency dependence of the phase velocity and of the attenuation is shown. Furthermore, our results are compared with the ones obtained in the context of Extended Thermodynamics at thirteen moments and with the experimental data. Finally, the propagation of acceleration waves is studied. The amplitude equation of the fastest mode is derived and the critical time is evaluated. (Received: November 17, 2004)