2022
DOI: 10.3390/fluids8010005
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Navier–Stokes Equations and Bulk Viscosity for a Polyatomic Gas with Temperature-Dependent Specific Heats

Abstract: A system of Navier–Stokes-type equations with two temperatures is derived, for a polyatomic gas with temperature-dependent specific heats (thermally perfect gas), from the ellipsoidal statistical (ES) model of the Boltzmann equation extended to such a gas. Subsequently, the system is applied to the problem of shock-wave structure for a gas with large bulk viscosity (or, equivalently, with slow relaxation of the internal modes), and the numerical results are compared with those based on the ordinary Navier–Stok… Show more

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Cited by 6 publications
(1 citation statement)
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“…However, Kustova, Mekhonoshina & Kosareva (2019) proposed a new bulk viscosity theory using the Chapman-Enskog method, which suggests that the CO 2 bulk viscosity and shear viscosity coefficients are of the same order at room temperature. In addition, many researchers have developed different theoretical models that include temperature-dependent bulk viscosity in recent years, such as the variable specific heat two-temperature Navier-Stokes equation (Kosuge & Aoki 2022), a state-to-state model suitable for mixtures of gases (Bruno & Giovangigli 2022), and a kinetic model with temperature-dependent vibrational degrees of freedom (Li & Wu 2022). Despite the many methods of evaluating the bulk viscosity coefficients, there are still large uncertainties in the bulk viscosity coefficients of common gases such as air, N 2 and CO 2 (Graves & Argrow 1999;Vieitez et al 2010;Jaeger, Matar & Müller 2018;.…”
Section: Casementioning
confidence: 99%
“…However, Kustova, Mekhonoshina & Kosareva (2019) proposed a new bulk viscosity theory using the Chapman-Enskog method, which suggests that the CO 2 bulk viscosity and shear viscosity coefficients are of the same order at room temperature. In addition, many researchers have developed different theoretical models that include temperature-dependent bulk viscosity in recent years, such as the variable specific heat two-temperature Navier-Stokes equation (Kosuge & Aoki 2022), a state-to-state model suitable for mixtures of gases (Bruno & Giovangigli 2022), and a kinetic model with temperature-dependent vibrational degrees of freedom (Li & Wu 2022). Despite the many methods of evaluating the bulk viscosity coefficients, there are still large uncertainties in the bulk viscosity coefficients of common gases such as air, N 2 and CO 2 (Graves & Argrow 1999;Vieitez et al 2010;Jaeger, Matar & Müller 2018;.…”
Section: Casementioning
confidence: 99%