lib.mEoS.He
===========

Fluid info
----------

* CAS Number: 7440-59-7
* Formula: He
* Synonym: R-704
* Molecular weigth: 4.002602 g/mol
* Tc:  5.1953 K
* Pc:  0.2276 MPa
* ρc:  69.6000 kg/m³
* Tt:  2.1768 K
* Tb:  4.2226 K
* Acentric factor: -0.385
* Dipole moment:  0.0 Debye

Equation of state
-----------------

* Ortiz-Vega, D.O.; A New Wide Range Equation of State for Helium-4. Doctoral Dissertation, Texas A&M University (2013), http://dx.doi.org/1969.1/151301
* McCarty, R.D., Arp, V.D.; A New Wide Range Equation of State for Helium. Adv. Cryo. Eng., 35:1465-1475, 1990, http://dx.doi.org/10.1007/978-1-4613-0639-9_174
* McCarty, R.D., Arp, V.D.; A New Wide Range Equation of State for Helium. Adv. Cryo. Eng., 35:1465-1475, 1990, http://dx.doi.org/10.1007/978-1-4613-0639-9_174
* Kunz, O., Wagner, W.; The GERG-2008 Wide-Range Equation of State for Natural Gases and Other Mixtures: An Expansion of GERG-2004. J. Chem.Eng. Data 57(11) (2012) 3032-3091, http://dx.doi.org/10.1021/je300655b


Viscosity
---------

* McCarty, R.D.; Thermophysical Properties of Helium-4 from 2 to 1500 K with Pressures to 1000 MPa. NIST Technical Note 631 (1972)

Thermal Conductivity
--------------------

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

* McCarty, R.D.; Thermophysical Properties of Helium-4 from 2 to 1500 K with Pressures to 1000 MPa. NIST Technical Note 631 (1972)


Calculation example
-------------------

Using the first option for equation of state, we can get this diagram plots with the liquid-gas saturation region:

.. image:: images/He.png

The diagram is generated with :download:`this module <../.script/plotMEoS.py>` running with the compound name as parameter or edited in file

.. code-block:: bash

    python3 plotMEoS.py He