Accession Number : AD0637798

Title :   ON THE THEORY OF TRANSPORT COEFFICIENTS FOR MODERATELY DENSE GASES.

Descriptive Note : Technical note.

Corporate Author : MARYLAND UNIV COLLEGE PARK INST FOR FLUID DYNAMICS AND APPLIED MATHEMATICS

Personal Author(s) : Haines,Larry K.

Report Date : JUN 1966

Pagination or Media Count : 226

Abstract : A complete description of the method of CohenDorfman-Ernst (in time or t language) and the method of Zwanzig (in Laplace transform or epsilon language) for computing a density expansion of the diffusion coefficient in a moderately dense gas, with short-range, repulsive molecular interactions, from time-correlation functions is given. Both of these methods are reformulated in order to facilitate their comparison. The methods are found to give identical results for the density expansion of the diffusion coefficient insofar as this expansion exists. It is shown, however, that the methods are not identical for arbitrary t and epsilon; that is, the Zwanzig method is not simply the Laplace transform of the Cohen-Dorfman-Ernst method. A derivation of the Zwanzig method is given, and the differences in motivation of the two methods are discussed. (Author)

Descriptors :   (*GASES, *TRANSPORT PROPERTIES), THEORY, DENSITY, DIFFUSION, INTEGRAL TRANSFORMS, MOLECULAR PROPERTIES, STATISTICAL MECHANICS

Subject Categories : Fluid Mechanics
      Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE