HELIUM
Helium provides thermodynamic properties for normal fluid (not superfluid) Helium using the fundamental equation of state developed by Ortiz Vega:
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
There are a few typographical errors in this work that should be noted. The sign for h and b in Eqn (75) should be positive, not negative as displayed when used with the coefficients in Table 4. Coefficient N4 in Equation (109) should also be positive. Coefficients s0/R and h0/(RT0) need to be adjusted to provide the desired reference state.
The specific enthalpy and entropy values provided by the equation of state are referenced to 0 for saturated liquid at the normal boiling point (4.23 K).
The equation of state is valid for temperatures between the lower l-point temperature (2.172 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