Diffusion in compressed binary gaseous systems

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Abstract
Apparatus is described for experimentally determining diffusion coefficients in dense‐gas systems to pressures of 15,000 lb./sq. in. abs. Tests were made with the hydrogen‐nitrogen and methane‐ethane systems at 104°, 139°, and 171°F. to 10,000 lb./sq. in. abs. and with the nitrogen‐methane and nitrogen‐ethane systems at 104°F. to 2,500 lb./sq. in. abs. In all cases it was found that diffusion coefficients predicted on the basis of the Lennard‐Jones model with Thorne's dense‐gas correction diverged below the experimental data in the high‐density region. Coefficients predicted from the Slattery‐Bird reduced‐state correlation showed better agreement with the experimental data. The temperature dependence of the results is better described by the exponential form for liquids than by the form of the dense‐gas theory.