Saturation Properties for Helium — 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, Normal Boiling Point Convention

Additional fluid properties

References and Notes

Equation of state

Ortiz-Vega, D.O., Hall, K.R., Holste, J.C., Arp, V.D., Harvey, A.H., and Lemmon, E.W., final equation of state, to be submitted to J. Phys. Chem. Ref. Data, 2018.

The uncertainties below 50 K in density are 0.25% at pressures up to 10 MPa. From 50 K to 200 K, the uncertainties decrease linearly from 0.2% at 50 K to 0.05% at 200 K for all pressures up to 50 MPa. Between 200 K and 500 K, the uncertainty is 0.03% up to pressures of 40 MPa and 0.1% between 40 MPa and 100 MPa. For all other states not listed here, the uncertainties increase to 0.5% in density. The uncertainties in the speed of sound are 0.01% for the vapor phase and 0.2% for the liquid phase. The uncertainty in vapor pressure is less than 0.02%, and that for heat capacities is about 2%. Uncertainties in the critical region are higher for all properties except vapor pressure.

Auxillary model, Cp0

Ortiz-Vega, D.O., Hall, K.R., Holste, J.C., Arp, V.D., Harvey, A.H., and Lemmon, E.W., 2018.

Auxillary model, PX0

Ortiz-Vega, D.O., Hall, K.R., Holste, J.C., Arp, V.D., Harvey, A.H., and Lemmon, E.W., 2018.

Viscosity

Arp, V.D., McCarty, R.D., and Friend, D.G., "Thermophysical Properties of Helium-4 from 0.8 to 1500 K with Pressures to 2000 MPa," NIST Technical Note 1334 (revised), 1998.

The uncertainty in viscosity is 10%.

Thermal conductivity

Hands, B.A.; Arp, V.D., A Correlation of Thermal Conductivity Data for Helium, Cryogenics, 1981, 21, 12, 697-703, https://doi.org/10.1016/0011-2275(81)90211-3 . [all data]

Hands, B.A. and Arp, V.D., "A Correlation of Thermal Conductivity Data for Helium," Cryogenics, 21(12):697-703, 1981.

The uncertainty in thermal conductivity is 5%, except at low temperatures where it increases to 10%.

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]

Dielectric constant

Harvey, A.H.; Lemmon, E.W., Method for Estimating the Dielectric Constant of Natural Gas Mixtures, Int. J. Thermophys., 2005, 26, 1, 31-46, https://doi.org/10.1007/s10765-005-2351-5 . [all data]

Metling line

McCarty, R.D. and Arp, V.D., "A New Wide Range Equation of State for Helium," Adv. Cryo. Eng., 35:1465-1475, 1990.

Vapor pressure

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

Functional Form: D=Dc*[1+SUM(Ni*Theta^ti)] 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

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

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