Accession Number : AD0266551

Title :   HEAT CONDUCTIVITY OF POLYATOMIC AND POLAR GASES,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Mason ,E. A. ; Monchick,L.

Report Date : AUG 1961

Pagination or Media Count : 1

Abstract : The formal kinetic theory of Wang Chang and Uhlenbeck (Univ. of Mich. Eng. Res. Rpt. no. CM-681, July 1951) and of Taxman (Phys. Rev. 110:1235, 1958) was used to derive explicit expressions for the heat conductivity of polyatomic and polar gases. By systematic inclusion of terms involving inelastic collisions the usual modified Eucken expression is derived as a first approximation, and as a second approximation an expression involving the relaxation times for various internal degrees of freedom (as well as the viscosity, diffusion coefficients, and heat capacity). For polar gases a second effect is often important since a resonant exchange of rotational energy is possible. The comparison of calculated and experimental results is generally satisfactory. (Author)

Descriptors :   *GASES, *KINETIC THEORY, *MOLECULES, *THERMAL CONDUCTIVITY, ATOMS, INELASTIC SCATTERING, QUANTUM THEORY, TRANSPORT PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE