Speed-of-sound measurements using spherical resonator and acoustic virial coefficients for gaseous pentafluoroethane (R125)

Takeshi Kojima, Kaku Okabe, Kazuhiro Ogawa, Haruki Sato

Research output: Contribution to journalArticle

Abstract

Speed-of-sound measurement with a spherical resonator is recognized as one of the most precise and reliable approaches to determine ideal-gas heat capacities and to reveal thermodynamic properties of rarefied gases. In this study, a spherical resonator was used to measure the speed of sound in gaseous pentafluoroethane, R125. Eighty speed-of-sound values were obtained along five isotherms from 277 K to 343 K and up to 600 kPa in pressure. In addition, c p o values and second acoustic virial coefficients were determined at each temperature. Sample purity was 99.9% of the gas-chromatograh area fraction analyzed by the manufacturer. The expanded uncertainties with k = 2 are estimated at 11 mK in temperature, 0.31 kPa in pressure, and 72 ppm in speed of sound. The cp o values reported here were compared with those from spectroscopic data. The agreement between them was within ±0.2%.

Original languageEnglish
Pages (from-to)635-638
Number of pages4
JournalJournal of Chemical and Engineering Data
Volume49
Issue number3
DOIs
Publication statusPublished - 2004 May

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Acoustic variables measurement
Acoustic wave velocity
Resonators
Acoustics
Gases
Specific heat
Isotherms
Thermodynamic properties
Temperature
pentafluoroethane

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Speed-of-sound measurements using spherical resonator and acoustic virial coefficients for gaseous pentafluoroethane (R125). / Kojima, Takeshi; Okabe, Kaku; Ogawa, Kazuhiro; Sato, Haruki.

In: Journal of Chemical and Engineering Data, Vol. 49, No. 3, 05.2004, p. 635-638.

Research output: Contribution to journalArticle

Kojima, Takeshi ; Okabe, Kaku ; Ogawa, Kazuhiro ; Sato, Haruki. / Speed-of-sound measurements using spherical resonator and acoustic virial coefficients for gaseous pentafluoroethane (R125). In: Journal of Chemical and Engineering Data. 2004 ; Vol. 49, No. 3. pp. 635-638.
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