Virial equation of state of helium, xenon, and helium-xenon mixtures from speed-of-sound and burnettPρT measurements |
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| Authors: | J. J. Hurly J. W. Schmidt S. J. Boyes M. R. Moldover |
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| Affiliation: | (1) Thermophysics Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, 20899 Gaithersburg, Maryland, USA;(2) Present address: Centre for Quantum Metrology, National Physical Laboratory, TW11 0LW Teddington, Middlesex, UK |
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| Abstract: | The virial equation of state was determined for helium, xenon, and helium-xenon mixtures for the pressure and temperature ranges 0.5 to 5 MPa and 210 to 400 K. Two independent experimental techniques were employed: BurnettPρT measurements and speed-of-sound measurements. The temperature-dependent second and third density virial coefficients for pure xenon and the second and third interaction density virial coefficients for helium-xenon mixtures were determined. The present density virial equations of state for xenon and helium-xenon mixtures reproduce the speed-of-sound data within 0.01% and thePρT data within 0.02% of the pressures. All the results for helium are consistent, within experimental errors, with recent ab initio calculations, confirming the accuracy of the experimental techniques. |
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| Keywords: | equation-of-state helium helium-xenon mixture speed-of-sound thermoacoustic refrigerators thermodynamic properties virial coefficients xenon |
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