On the utility of the m-6-8 potential function

Hanley, H. J. M.

doi:10.6028/nbs.tn.628

Cited by 2 publications

(4 citation statements)

References 35 publications

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“…In particular, the calculation indicates the sign change of 0:0 at low temperatures. Our previous calculations with the spherical m-6-8 PQtential gave values of 0:0 which were always positive for nitrogen (59].…”

Section: Thermal Diffusion Factormentioning

confidence: 75%

“…On the basis of these arguments, equations {8) and (10) for the viscosity and thermal conductivity coefficients respectively can be the foundation for tabular values given a suitable potential function. At this stage, however, we should point out that it has been shown [59] that the m-6-8 spherical potential of equation 1can correlate the viscosity and thermal conductivity coefficients of oxygen and nitrogen to within experimental error. This implies that the angularly averaged collision integrals of equation 15cannot be much different from the angle independent integrals, and that the m-6-8 potential parameters, selected on the basis that the intermolecular interactions are.…”

Section: Nonspherical Interactionsmentioning

confidence: 92%

“…Finally, the last two terms depict the anisotropy in the repulsive and attractive forces, respectively. However, we have chosen to neglect these latter two contributions [60,61] in our previous work for the following reasons: (1) it is currently impossible to determine independently the parameters for the shape part of the potential and (2) the spherical m-6-8 potential yields a very reasonable representation of experimental transport properties [59] and presumably, therefore, anisotropy is at least partially accounted for in the selection of spherical potential parameters, viz., m, ,}" CT, and e/ k.…”

Section: The Potential Functionmentioning

confidence: 99%

“…Given the spherical collision integrals for the m- [6][7][8] potential [68], initial estimates of m, /" u, and E/ k were obtained by requiring that the first approximation viscosity equation [with jTl = 1 of equation (8)] fit the selected viscosity data over the complete temperature range of interest. Details are given in I and in reference [59]. It should be recalled that this criterion, i.e., requiring.…”

Section: Parameter Selectionmentioning

confidence: 99%

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The Viscosity and Thermal Conductivity Coefficients of Dilute Nitrogen and Oxygen

Hanley

Ely

1973

Journal of Physical and Chemical Reference Data

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The viscosity and thermal conductivity coefficients of dilute oxygen and nitrogen are discussed and tables of values are presented for temperatures between 80 and 2000 K. The oxygen viscosity tables are estimated to be accurate to two percent for temperatures up to 400 K and four percent above that temperature; the nitrogen viscosity tabJes are estimated to be reliable to one percent in the range 100-1000 K, increasing to two percent above 1000 K and below 100 K. The error assigned to the thermal conductivity is three percent below 400 K and five perc~nt above 400 K for both gases. The tables were calculated from the appropriate kinetic theory equations using the m-6-8 model potential with nonspherical contributions. The approximations to the equations are discussed. It is emphasized that the available data for oxygen viscosity are generally poor and that the thermal conductivity data for both oxygen and nitrogen cannot be considered reliable at high temperatures. No oxygen data exist for temperatures above 1500 K. .

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Section: Thermal Diffusion Factormentioning

confidence: 75%

Section: Nonspherical Interactionsmentioning

confidence: 92%