(3He) is an stable isotope of helium that is increasingly being
used in a number of areas such as fundamental physics, space technology,
nuclear fusion and cryogenic engineering, especially in milli-Kelvin
refrigeration technologies. The critical and normal boiling temperatures
of 3He are 3.3157 K and 3.1968 K, respectively. 3He
transists into superfluid phase below 0.0026 K. He3Pak was
developed on the basis of (a) a saturation pressure equation valid from
2.6 mK to the critical point 3.3157 K, (b) a saturation density equation
valid from 2.6 mK to the critical point 3.3157 K, (c) melting pressure and
density equations valid from 2.6 mK to 35 K, and (d) a Debye fluid state
equation using Helmholtz potential function valid for temperature from 2.6
mK to 1500 K, and pressure up to 20 MPa. (e) equations for thermal
conductivity and viscosity valid for temperature from 2.6 mK to 500 K and
pressure up to 20 MPa. (f) Surface tension equation from 3 mK to 3.3157 K.
All these equations have been published on peer-reviewed journals. He3Pak
covers the liquid-vapor equilibrium line, the liquid-solid equilibrium
line and the compressed liquid, real gas and critical regions. The
uncertainly for calculations of p-ρ-T,
specific heat and sound velocity, etc are general within ±1%.
was initially created by Dr. Yonghua HUANG and Prof. Guobang CHEN as
version 1.0 in 2005 in Zhejiang University, with technical help from Dr.
Vincent Arp, Cryodata Inc. He3Pak was maintained by Dr. Yonghua HUANG
after he graduated and moved to Shanghai Jiao Tong University. The version
was updated to v1.2 in 2007 and to v2.0 in 2009. The code of v2.0 for the
graphical user interface was completely re-written in Microsoft Visual
Basic .NET. The new version improves many functions such as unit
conversion, data output and print. It also provides more features like data
plotting. Bugs found by the developer and from user report was fixed in
the kernel Fortran computation codes.
reference to the He3Pak program in publications, please use the following:
Huang Y. H., Chen G. B., Arp V. D. Debye equation of state for fluid
helium-3. J. Chem. Phys., 2006, 125(5):054505.
Huang, Y.H., Chen, G.B., Arp, V.D., Helium-3 Thermophysical Properties
Program - He3Pak, Version 2.0, Shanghai Jiao Tong University, 2009
(available from Horizon Technologies, Littleton, CO, USA, http://www.htess.com.)
works via a friendly graphical front panel with on-line help document and
pdf user's manual. It provides both a Metric and English unit systems.
He3Pak is able to calculate thermophysical properties of 3He
over a wide range of temperatures from 2.6 mK (the default lower limit
value is set as 0.01 K) to 1500 K and pressures up to 20 MPa.
properties: temperature, pressure, density, specific volume, internal
energy, enthalpy, entropy, compressibility factor, Helmholtz free energy,
Gibbs free energy, latent heat, 2nd virial coefficient, 3rd
virial coefficient, isochoric specific heat, isobaric specific heat,
sound velocity, isothermal compressibility, volume expansivity,
isentropic expansion coefficient, adiabatic compressibility, Joule-Thomson
coefficient, dp/dρ, dp/dT, dρ/dT,
dB/dT, Gruneisen parameter, thermal conductivity, viscosity, surface
distributes as an standard installation package, which includes:
a stand-alone executable.
a static library file (He3EOS.lib) created by Fortran compiler. This file
contains all the functions/subroutines called by He3Pak (the user
interface). He3EOS.dll could be incorporated into any Fortran (should
also work for C/C++) code project.
a standard Windows Dynamically Linked Library file (He3EOS.dll), which
provides the interfaces to all those functions/subroutines. This file
could be used for Excel VBA programming or other language programming.
(4) a COM
dll (He3EOSCOM.dll). When this COM component server is registered,
the helium-3 property functions could be called by codes in C/C++,
C#, VB, VBA, Fortran...
requirement for He3Pak 2.0:
7, Windows Vista, Windows XP, Windows 2000, 98SE operating system.
.NET Framework 2.0
Pentium 266MHz or above.
least 50MB free hard disk space.
2.0 has not been tested on Windows 95 or Windows NT 4.0 systems.