The speed of sound in gaseous argon at temperatures between 110 K and 450 K and at pressures up to 19 MPa

Estrada-Alexanders, Andrés F.; Trusler, J. P. Martin

doi:10.1006/jcht.1995.0113

Cited by 64 publications

(59 citation statements)

References 15 publications

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“…Remarkably, the most recent of these publications is 35 years old. Thus, these studies did not benefit from the dramatic reduction in the uncertainty of speed-of-sound measurements that acoustic thermometry has achieved during the past 20 years [ 3 , 28 – 30 ].…”

Section: Resultsmentioning

confidence: 99%

Improved first-principles calculation of the third virial coefficient of helium

Garberoglio

Moldover

Harvey

2011

J. Res. Natl. Inst. Stand. Technol.

104

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We employ state-of-the-art pair and three-body potentials with path-integral Monte Carlo (PIMC) methods to calculate the third density virial coefficient C(T) for helium. The uncertainties are much smaller than those of the best experimental results, and approximately one-fourth the uncertainty of our previous work. We have extended our results in temperature down to 2.6 K, incorporating the effect of spin statistics that become important below approximately 7 K. Results are given for both the 3He and 4He isotopes. We have also performed PIMC calculations of the third acoustic virial coefficient γa; our calculated values compare well with the limited experimental data available. A correlating equation for C(T) of 4He is presented; differentiation of this equation provides a reliable and simpler way of calculating γa.

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Section: Resultsmentioning

confidence: 99%

Improved first-principles calculation of the third virial coefficient of helium

Garberoglio

Moldover

Harvey

2011

J. Res. Natl. Inst. Stand. Technol.

104

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“…Due to their importance and availability at high purity (in this work with a given impurity for argon of ≤10 ppm and for nitrogen of ≤8 ppm, both purchased at Linde), these fluids have been measured by many authors. [20][21][22][23] At around ambient temperature, a minimum pressure for argon of 15 MPa was determined by Meier and Kabelac 6 and of 100 MPa by Kortbeek et al 2 and for nitrogen of 20 MPa by Meier 5 and Gedanitz 22 for measuring the speed of sound using the pulse-echo technique with the interference approach. These authors were not able to distinguish the echoes below these pressure limits, due to the challenges of the pulse-echo approaches discussed above.…”

Section: Extension Of the Measurement Range For Gasesmentioning

confidence: 99%

Burst design and signal processing for the speed of sound measurement of fluids with the pulse-echo technique

Dubberke

Baumhögger

Vrabec

2015

Review of Scientific Instruments

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The pulse-echo technique determines the propagation time of acoustic wave bursts in a fluid over a known propagation distance. It is limited by the signal quality of the received echoes of the acoustic wave bursts, which degrades with decreasing density of the fluid due to acoustic impedance and attenuation effects. Signal sampling is significantly improved in this work by burst design and signal processing such that a wider range of thermodynamic states can be investigated. Applying a Fourier transformation based digital filter on acoustic wave signals increases their signal-to-noise ratio and enhances their time and amplitude resolutions, improving the overall measurement accuracy. In addition, burst design leads to technical advantages for determining the propagation time due to the associated conditioning of the echo. It is shown that the according operation procedure enlarges the measuring range of the pulse-echo technique for supercritical argon and nitrogen at 300 K down to 5 MPa, where it was limited to around 20 MPa before.

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“…(3) It has been noted that the radius of the resonator sometimes exhibits irreversible changes after thermal cycles and that the present calibration is subject to an uncertainty of up to 30·10 −6 ·a 0 . This factor, together with the possible presence of undetected impurities, limits somewhat the absolute accuracy of the speed of sound obtained.…”

Section: Methodsmentioning

confidence: 99%