Accession Number : AD0272773

Title :   QUANTUM MECHANICAL STUDY OF THE VISCOSITY OF GASES

Corporate Author : PHYSICS ENGINEERING CHEMISTRY CORP BOULDER COLO

Personal Author(s) : ASHBY,NEIL

Report Date : DEC 1961

Pagination or Media Count : 1

Abstract : A general uniform deformation of a portion of gas or fluid is described quantum mechanically and an appropriate effective Hamiltonian is derived. This Hamiltonian is then used to derive operator expressions for the stress tensor, and for the coefficients of shear and bulk viscosity. The resulting expressions for the viscosity coefficients are formally exact and hold for all homogeneous systems. The formula for the shear viscosity is evaluated in a very simple approximation and the results are shown to correspond closely to those derived on the basis of the kinetic theory of gases. A better approximation, which should be good for long-range forces, is suggested and investigated briefly. (Author)

Descriptors :   *GASES, *QUANTUM THEORY, *TRANSPORT PROPERTIES, SHEAR STRESSES, TENSOR ANALYSIS, VISCOSITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE