A Study of Linear Waves Based on Extended Thermodynamics for Rarefied Polyatomic Gases
We study the dispersion relation for sound in rarefied polyatomic gases basing on the recently developed theory of extended thermodynamics (ET) for both dense and rarefied polyatomic gases. For hydrogen and deuterium gases in a wide temperature range where the rotational and vibrational modes in a molecule play a role, we compare the dispersion relations with those obtained in experiments and by the classical NavierStokes Fourier theory. From the comparison with experiments, we estimate the bulk viscosity and evaluate its temperature dependence. We study the characteristics of attenuation in a gas which has a larger relaxation time related to the dynamic pressure than the other relaxation times related to the shear stress and the heat flux by adopting the ET theory with 6 fields.
extended thermodynamics dispersion relation for sound bulk viscosity relaxation time rarefied polyatomic gas phase velocity and absorption 76j20 82c35 76n15 76p05