Saturation Properties for Helium — Temperature Increments
- Fluid Data
- Auxiliary Data
- References and Notes
- Notes
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The following adjustments were made to the specified data range:
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Fluid Data
Data on Saturation Curve
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Auxiliary Data
Reference States, Normal Boiling Point Convention
Enthalpy | H = 0 at the normal boiling point for saturated liquid. |
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Entropy | S = 0 at the normal boiling point for saturated liquid. |
Additional fluid properties
Critical temperature (Tc) | 5.1953 K |
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Critical pressure (Pc) | 0.22832 MPa |
Critical density (Dc) | 17.3837 mol/l |
Acentric factor | -0.3836 |
Normal boiling point | 4.2238 K |
Dipole moment | 0.0 Debye |
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.
Notes
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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