Saturation Properties for Sulfur hexafluoride — Temperature Increments

The following adjustments were made to the specified data range:

Fluid Data

Data on Saturation Curve

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Auxiliary Data

Reference States, IIR Convention

Additional fluid properties

References and Notes

Equation of state

Guder, C.; Wagner, W., A Reference Equation of State for the Thermodynamic Properties of Sulfur Hexafluoride (SF6) for Temperatures from the Melting Line to 625 K and Pressures up to 150 MPa, J. Phys. Chem. Ref. Data, 2009, 38, 1, 33-94, https://doi.org/10.1063/1.3037344 . [all data]

The uncertainties in density are 0.02% for temperatures less than 340 K (<30 MPa), 0.03% for temperatures below 500 K (<30 MPa), 0.1% increasing to 0.3% at temperatures above 500 K, and 0.2% for all temperatures at pressures above 30 MPa increasing to 1% at the pressure limits of the equation of state. In the critical region, the uncertainty in pressure is 0.01%. The uncertainties in the speed of sound range from 0.1% at the lowest temperatures in the gas phase, to 0.5% in the liquid, and to 1-2% elsewhere. The uncertainties in heat capacities are generally within 2%, decreasing to 0.2% at the lowest pressures in the vapor phase; below 400 K and above 20 MPa, the uncertainties are 5%. The uncertainty in vapor pressure is 0.01%.

Auxillary model, Cp0

Guder, C. and Wagner, W., 2009.

Auxillary model, PX0

Guder, C. and Wagner, W., 2009.

Auxillary model, PH0

Guder, C. and Wagner, W., 2009.

Viscosity

Quiñones-Cisneros, S.E.; Huber, M.L.; Deiters, U.K., Correlation for the Viscosity of Sulfur Hexafluoride (SF6) from the Triple Point to 1000 K and Pressures to 50 MPa, J. Phys. Chem. Ref. Data, 2012, 41, 2, 023102, https://doi.org/10.1063/1.3702441 . [all data]

In the low-pressure (less than 0.33 MPa) region from 300 K to 700 K the estimated uncertainty is 0.3%. In the region from 300 K to 425 K for pressures less than 20 MPa, the estimated uncertainty is less than 1%. Where there were data available for validation at temperatures from 230 K to 575 K for pressures up to 50 MPa, the estimated uncertainty is 2%. The correlation extrapolates in a physically reasonable manner and may be used at pressures to 100 MPa and temperatures from the triple point to 1000 K.

Thermal conductivity

Assael, M.J.; Koini, I.A.; Antoniadis, K.D.; Huber, M.L.; Abdulagatov, I.M.; Perkins, R.A., Reference Correlation of the Thermal Conductivity of Sulfur Hexafluoride from the Triple Point to 1000 K and up to 150 MPa, J. Phys. Chem. Ref. Data, 2012, 41, 2, 023104, https://doi.org/10.1063/1.4708620 . [all data]

The overall uncertainty is estimated, for pressures less than 150 MPa and temperatures less than 1000 K, to be less than 4%.

Auxillary model, the thermal conductivity critical enhancement

Assael, M.J., Koini, I.A., Antoniadis, K.D., Huber, M.L., Abdulagatov, I.M., and Perkins, R.A., 2012.

Dielectric constant

Harvey, A.H.; Mountain, R.D., Correlations for the Dielectric Constants of H2S, SO2, and SF6, Int. J. Thermophys., 2017, 38, 10, 147, https://doi.org/10.1007/s10765-017-2279-6 . [all data]

Harvey, A.H. and Mountain, R.D., "Correlations for the Dielectric Constants of H2S, SO2, and SF6," Int. J. Thermophys., 38:147, 2017.

Surface tension

Mulero, A.; Cachadiña, I.; Parra, M.I., Recommended Correlations for the Surface Tension of Common Fluids, J. Phys. Chem. Ref. Data, 2012, 41, 4, 043105, https://doi.org/10.1063/1.4768782 . [all data]

Metling line

Harvey, Allan H., On the Melting Curve of Sulfur Hexafluoride, Journal of Physical and Chemical Reference Data, 2017, 46, 4, 043102, https://doi.org/10.1063/1.5005537 . [all data]

Harvey, A.H., "On the Melting Curve of Sulfur Hexafluoride," J. Phys. Chem. Ref. Data, 46(4), 043102, 2017.

Sublimation line

Guder, C.; Wagner, W., A Reference Equation of State for the Thermodynamic Properties of Sulfur Hexafluoride (SF6) for Temperatures from the Melting Line to 625 K and Pressures up to 150 MPa, J. Phys. Chem. Ref. Data, 2009, 38, 1, 33-94, https://doi.org/10.1063/1.3037344 . [all data]

Guder, C. and Wagner, W., 2009.

Vapor pressure

Guder, C. and Wagner, W., 2009.

Functional Form: P=Pc*EXP[SUM(Ni*Theta^ti)*Tc/T] where Theta=1-T/Tc, Tc and Pc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid density

Guder, C. and Wagner, W., 2009.

Functional Form: D=Dc*EXP[SUM(Ni*Theta^(ti/3))*Tc/T] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid volume

Guder, C. and Wagner, W., 2009.

Functional Form: D=Dc*EXP[SUM(Ni*Theta^(ti/3))*Tc/T] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

Metling line

Guder, C. and Wagner, W. "A Reference Equation of State for the Thermodynamic Properties of Sulfur Hexafluoride (SF6) for Temperatures from the Melting Line to 625 K and Pressures up to 150 MPa," J. Phys. Chem. Ref. Data, 38(1):33-94, 2009.

The fluid data above is also available from the NIST Reference Fluid Thermodynamic and Transport Properties Database. This product includes additional features not available from this web site.

Notes