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The density dependence of the self-diffusion coefficient of liquid methane

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  • Harris, K.R.
  • Trappeniers, N.J.

Abstract

Self-diffusion coefficients for liquid methane obtained by the NMR spin-echo technique are reported at 110, 140 and 160 K. The density range extends to the freezing line at 110 and 140 K, and to 30 mol/dm3 at 160 K. Using the hard sphere diameter as a single temperature dependent parameter it was found that the reduced diffusivity isotherms fall on a common curve when plotted against reduced density [n∗#620.26, 0.58⩽Tr⩽1.70]. Literature viscosities could also be correlated in this way using diameters obtained from the diffusion data. The experimental results are in good agreement with molecular dynamics calculations for the hard sphere fluid, except at densities above n∗ = 0.87. This difference at high densities is similar to deviations from the rough hard sphere model observed for more complex molecular liquids (CCl4, C6H6). The diffusion data are also compared with the results of molecular dynamics and other calculations for more sophisticated potential models.

Suggested Citation

  • Harris, K.R. & Trappeniers, N.J., 1980. "The density dependence of the self-diffusion coefficient of liquid methane," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 104(1), pages 262-280.
    • Handle: RePEc:eee:phsmap:v:104:y:1980:i:1:p:262-280
    DOI: 10.1016/0378-4371(80)90087-4
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    References listed on IDEAS

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    1. T. Collings & C. Stoneman, 1976. "The M / M /∞ Queue with Varying Arrival and Departure Rates," Operations Research, INFORMS, vol. 24(4), pages 760-773, August.
    2. Lasley, Floyd A. & Jones, W. Webster & Sitzman, Leah, 1978. "Milk Dealers' Sales and Costs: A Trend Analysis, 1952-77," Economics Statistics and Cooperative Services (ESCS) Reports 143666, United States Department of Agriculture, Economic Research Service.
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    Cited by:

    1. Bardow, André & Christian Öttinger, Hans, 2007. "Consequences of the Brenner modification to the Navier–Stokes equations for dynamic light scattering," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 373(C), pages 88-96.

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