Journal
MOLECULAR PHYSICS
Volume 105, Issue 23-24, Pages 3035-3049Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268970701744584
Keywords
helium pair potential; helium gas property standards; second and third pressure virial coefficients; viscosity; thermal conductivity
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A helium-helium interatomic potential energy curve determined from quantum-mechanical ab initio calculations and described with an analytical representation considering relativistic retardation effects (R. Hellmann, E. Bich, and E. Vogel, Molec. Phys. (in press)) was used in the framework of the quantum-statistical mechanics and of the corresponding kinetic theory to calculate the most important thermophysical properties of helium governed by two-body and three-body interactions. The second pressure virial coefficient as well as the viscosity and thermal conductivity coefficients, the last two in the so-called limit of zero density, were calculated for He-3 and He-4 from 1 to 10000 K and the third pressure virial coefficient for He-4 from 20 to 10000 K. The transport property values can be applied as standard values for the complete temperature range of the calculations characterized by an uncertainty of +/-0.02% for temperatures above 15 K. This uncertainty is superior to the best experimental measurements at ambient temperature.
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