Equilibrium and transport estimates for hydrogen and helium via Lennard--Jones fluid
The results of molecular dynamic transport calculations for the Lennard--Jones shear viscosity and thermal conductivity over a wide density and temperature range have been succinctly expressed in terms of the excess coefficients (that part above the temperature-dependent dilute gas value). These expressions reproduce within 2 percent the experimental viscosity data of H/sub 2/ and D/sub 2/ (to 2000 atm); and within 5 percent the experimental thermal conductivity of H/sub 2/ (to 600 atm) and He (to 1200 atm). The Lennard--Jones equations-of-state, expressed as a density-temperature expansion for Helmholtz free energy, when combined with the hydrogen third virial coefficient reproduces hydrogen compressibility within 0.5 percent. These same expressions can also be used to estimate helium and hydrogen-helium compressibilities. FORTRAN program LJHEOS, which produces these estimates as a function of temperature and pressure (or density), has been used to generate tables of shear viscosity, thermal conductivity, compressibility (with quantum effects), density, internal energy, enthalpy, specific heats and their ratio, sound speed, kinematic viscosity, thermal diffusivity, Prandtl number, thermal expansion, Grashof number, entropy, and Helmholtz free energy for the hydrogen and helium isotopes. Twenty-eight isotherms (from -175/sup 0/C to 3000/sup 0/C) for pressure up to 20,000 atmospheres are given.
- Research Organization:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- DOE Contract Number:
- E(29-1)-789
- OSTI ID:
- 7231851
- Report Number(s):
- SAND76-8710
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
08 HYDROGEN
HELIUM
LENNARD-JONES POTENTIAL
THERMODYNAMIC PROPERTIES
HYDROGEN
COMPRESSIBILITY
EQUATIONS OF STATE
SHEAR
TABLES
THERMAL CONDUCTIVITY
VISCOSITY
CRYOGENIC FLUIDS
ELEMENTS
EQUATIONS
FLUIDS
INFORMATION
MECHANICAL PROPERTIES
NONMETALS
PHYSICAL PROPERTIES
RARE GASES
CSP
Concentrating Solar Power
640410* - Fluid Physics- General Fluid Dynamics
080000 - Hydrogen