TRIPLE COLLISION EFFECTS IN THE THERMAL CONDUCTIVITY AND VISCOSITY OF MODERATELY DENSE GASES
Final rept. 1 Feb 1966-1 Sep 1968
NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD
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A quantitative study is made of the effect of successive correlated binary collisions on the transport properties of gases. In particular, the triple collision transport integrals determining the first density coefficients of thermal conductivity and viscosity are derived for a gas of hard spherical molecules and estimates are presented for these integrals. By applying the method to a two dimensional gas of hard disks, a logarithmic density dependence of the transport coefficients is demonstrated. In addition, an analysis is made of experimental data for the transport properties as a function of density. It is shown that the theoretically predicted density dependence is at least consistent with the experimental information. Experimental values for the first density coefficients of thermal conductivity and viscosity are reported, together with an assessment of their precision.