HELIUM
Helium provides thermodynamic properties for normal fluid (not superfluid) Helium reported by:
Diego O. Ortiz Vega, Kenneth R. Hall, James C. Holste, Allan H. Harvey, Eric W. Lemmon
An Equation of State for the Thermodynamic Properties of Helium
NIST Internal Report, NIST IR 8474 https://doi.org/10.6028/NIST.IR.8474 68
(EES versions prior to 12.320 used the following reference)
Diego Orlando Ortiz Vega
A New Wide Range Equation of State for Helium-4
PhD Thesis, Chemical Engineering
Texas A&M University, August 2013
https://oaktrust.library.tamu.edu/handle/1969.1/151301
The specific enthalpy and entropy values provided by the equation of state are referenced to 0 for saturated liquid at the normal boiling point (4.224 K).
The equation of state is valid for temperatures between the lower l-point temperature (2.1768 K) and 1500 K for pressures up to 2000 MPa.
Viscosity data:
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, Boulder, CO 1998.
Thermal Conductivity Data:
Hands, B.A. and Arp, V.D.,"A Correlation of Thermal Conductivity Data for Helium," Cryogenics, 21(12):697-703, 1981.
Surface tension data are provided using the information in:
Mulero, A., Cachadina, I, and Parra, M.
"Recommended Correlations for the Surface Tension of Common Fluids"
J.Phys. Chem Ref. Data, Vol. 41, No.4, 2012