Use of binary diffusion and second virial coefficients to predict viscosities of gaseous systems

Abstract

Accurate binary diffusion coefficients measured over the temperature range 275-323 K, together with some excellent virial coefficients in the literature, have been used to derive (m,6,8) potential parameters for the systems He-CH4, He-CF4, He-O2, Ar-O2, CH4-C2H6, CH4-C3H8 and CH4-C4H10. These parameters predict quite well the viscosities reported for these systems by Kestin and coworkers. The results indicate that binary diffusion coefficients can be used to predict viscosities more accurately than binary viscosities can be used to predict diffusion coefficients.

Cross Second Virial Coefficients and Dilute Gas Transport Properties of the (CH4+ C3H8) and (CO2+ C3H8) Systems from Accurate Intermolecular Potential Energy Surfaces

“…Relative deviations of experimental data and calculated values for the binary diffusion coefficient of the (CH 4 + C 3 H 8 ) system in the dilute gas phase from values calculated at the same molar densities using the CH 4 –C 3 H 8 PES of the present work, the CH 4 –CH 4 PES of ref , and the C 3 H 8 –C 3 H 8 PES of ref as a function of temperature: ●, Gotoh et al, x CH 4 = 0.5; , Arora et al, x CH 4 = 0.2, smoothed values; – · −, result for the unadjusted CH 4 –C 3 H 8 PES with x CH 4 = 0.5.…”

“…Finally, Figures and show the comparison of the calculated values for the product of molar density and binary diffusion coefficient in the dilute gas limit for both systems with the few available experimental data. − The binary diffusion coefficient is determined almost entirely by the unlike interactions and, as can be seen in Table , its product with molar density is only very weakly dependent on composition. Therefore, the two figures depict the deviations as a function of temperature instead of mole fraction.…”

“…The single datum of Kugler et al for the (CO 2 + C 3 H 8 ) system is also consistent with the calculated value considering the rather large uncertainty given by the authors. Unfortunately, Arora et al provided only smoothed values of their data for the (CH 4 + C 3 H 8 ) system in the form of a polynomial in temperature without uncertainty estimates, but the agreement with the calculated values is excellent with deviations of at most 0.3%. In this context, it is worth mentioning that Jäger and Bich found similarly good agreement between highly accurate ab initio calculated values for the binary diffusion coefficient of the (Kr + He) system with data reported by Arora et al, thus providing strong evidence that the excellent agreement for the (CH 4 + C 3 H 8 ) system is not coincidental.…”

Determination of the Binary Diffusion Coefficients and Interaction Viscosities of the Systems Carbon Dioxide–Nitrogen and Ethane–Methane in the Dilute Gas Phase from Accurate Experimental Viscosity Data Using the Kinetic Theory of Gases

“…[9] illustrates deviations of experimental data ( D 12,exp ) (0) of a few authors from theoretical values ( D 12,cal ) (0) computed for the nonspherical potential. Hellmann [9] found that the data of Arora et al [46] given in the temperature range from 275 K to 323 K differ from his calculations only by about −0.5 % , whereas the data of the other authors show deviations > ±1 % . Moreover, Fig.…”

Diffusion and Thermal Diffusion in Some Binary Mixtures of the Major Components of Air

“…In previous papers we have reported diffusion coefficients for binary mixtures of argon with nitrogen [t, 2) and oxygen [3,4), and thermal diffusion factors for argon and nitrogen [4,5). The purpose of this paper is to report data for temperature of the diffusion coefficients of the four other binary systems which can be formed from the four major components of air, together with thermal diffusion factors for the systems N 2 -CO 2 and O 2 -CO 2 , Since our method of analysis depends on thermal conductivity measurements, we have been unable to measure useful thermal diffusion factors for the systems Ar -CO 2 and N 2 -O 2 with our present apparatus, however we hope to make modifications which will yield greater sensitivity in the future.…”