Helium

References

Equation of State

D. O. Ortiz-Vega, K. R. Hall, J. C. Holste, V. D. Arp, A. H. Harvey, and E. W. Lemmon. Equation of state for Helium-4. Unpublished - coefficients from REPROP 10 with permission, 2019.

Thermal Conductivity

B.A. Hands and V.D. Arp. A Correlation of Thermal Conductivity Data for Helium. Cryogenics, 21(12):697–703, 1981. doi:10.1016/0011-2275(81)90211-3.

Viscosity

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

Melting Line

Frédéric Datchi, Paul Loubeyre, and René LeToullec. Extended and accurate determination of the melting curves of argon, helium, ice (H$_2$O) and hydrogen (H$_2$). Physical Review B, 61(10):6535–6546, 2000. doi:10.1103/PhysRevB.61.6535.

Surface Tension

A. Mulero, I. Cachadiña, and M. I. Parra. Recommended Correlations for the Surface Tension of Common Fluids. J. Phys. Chem. Ref. Data, 41(4):043105–1:13, 2012. doi:10.1063/1.4768782.

Aliases

helium, HELIUM, He, R704

Fluid Information

Parameter, Value

General

Molar mass [kg/mol]

0.004002602

CAS number

7440-59-7

ASHRAE class

A1

Formula

\(He\)

Acentric factor

-0.3836

InChI

InChI=1S/He

InChIKey

SWQJXJOGLNCZEY-UHFFFAOYSA-N

SMILES

[He]

ChemSpider ID

22423

2D image

http://www.chemspider.com/ImagesHandler.ashx?id=22423

Limits

Maximum temperature [K]

2000.0

Maximum pressure [Pa]

1000000000.0

Triple point

Triple point temperature [K]

2.1768

Triple point pressure [Pa]

5033.5488966581215

Critical point

Critical point temperature [K]

5.1953000000000005

Critical point density [kg/m3]

72.56717426

Critical point density [mol/m3]

18130.0

Critical point pressure [Pa]

227600.0

REFPROP Validation Data

Note

This figure compares the results generated from CoolProp and those generated from REFPROP. They are all results obtained in the form \(Y(T,\rho)\), where \(Y\) is the parameter of interest and which for all EOS is a direct evaluation of the EOS

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.

../../_images/Helium.png

Consistency Plots

The following figure shows all the flash routines that are available for this fluid. A red + is a failure of the flash routine, a black dot is a success. Hopefully you will only see black dots. The red curve is the maximum temperature curve, and the blue curve is the melting line if one is available for the fluid.

In this figure, we start off with a state point given by T,P and then we calculate each of the other possible output pairs in turn, and then try to re-calculate T,P from the new input pair. If we don’t arrive back at the original T,P values, there is a problem in the flash routine in CoolProp. For more information on how these figures were generated, see CoolProp.Plots.ConsistencyPlots

Note

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.

../../_images/Helium1.png