Thermal Conductivity of Gas Mixtures in Chemical Equilibrium

Abstract

A general expression applying to the steady state has been derived which permits calculation of the increase in thermal conductivity due to chemical reaction in mixtures of gases in chemical equilibrium. In addition to the gas composition, heats of reaction and binary diffusion coefficients among the component gases are required. In the case of a simple dissociation, the thermal conductivity may be related to the equilibrium heat capacity. This suggests a possible method for estimating heat transfer in various practical systems with dissociating gases. Approximate calculations for dissociation of diatomic molecules at equilibrium show that the thermal conductivity may be an order of magnitude greater than in nonreacting mixtures. Calculations for the systems 2NO2⇆N2O4 and 6HF⇆(HF)6 are in satisfactory agreement with experiment.

Transport coefficients of high-temperature nitrogen

“…The third and second approximations of the Chapman-Enskog (C-E) method have been respectively used for calculating AE and AH, while AR has been computed with the general Butler and Brokaw expression [8] including the following reactions…”

La Chimie Des Plasmas Et Ses Débouchés a Court Terme Sur Des Synthèses Inorganiques a Caractère Industriel

“…L'étude théorique en cinétique physique classique des coefficients de transport.d'un plasma se fait à l'aide de l'équa-tion intégro-différentielle de Boltzmann [143, Pour le calcul des coefficients de transport les divers auteurs s'inspirent généralement des travaux de Devoto [147]. Cependant l'existence d'échanges d'énergie entre les degrés internes de liberté [152] et le fait que le plasma considéré soit le siège d'un certain nombre de réactions chimiques [153] entraî-nent l'adjonction de deux termes correctifs à la conductibilité thermique (de translation) prolongée par Devoto. Ces derniers ne peuvent malheureusement être calculés qu'à l'ordre un.…”

Numerical Investigation of a Local Oxygen Injection Effect on Argon Induction Plasmas Using a Chemically Non-Equilibrium Model

“…In this study, λ h tr and λ e tr were estimated with the second-order and the third-order approximations, respectively, as suggested by Devoto (1967b). The reactive and internal conductivities were estimated with the first-order approximation of the Chapman-Enskog method (Bulter and Brokaw, 1957;Muckenfuss and Curtiss, 1958). The thermal conductivity has the high values where dissociation and ionization occur.…”