ON THE THEORY OF TRANSPORT COEFFICIENTS FOR MODERATELY DENSE GASES.
MARYLAND UNIV COLLEGE PARK INST FOR FLUID DYNAMICS AND APPLIED MATHEMATICS
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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
- Fluid Mechanics
- Quantum Theory and Relativity