Ideal-gas specific heat and second virial coefficient of HFC-125 based on sound-velocity measurements

Journal Article · Wed May 01 00:00:00 EDT 1996 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF01441505· OSTI ID:471824

Hozumi, T; Sato, H; Watanabe, K ^[1]

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1. Keio Univ., Yokohama (Japan)

The sound velocity in gaseous pentafluoroethane (HFC-125, CF{sub 3}CHF{sub 2}) has been measured by means of a spherical acoustic resonator. Seventy-two sound-velocity values were measured with an uncertainty of {plus_minus}0.01% at temperatures form 273 to 343 K and pressures form 10 to 250 kPa. The ideal-gas specific heats and the second acoustic-virial coefficients have been determined on the basis of the sound-velocity measurements. The second virial coefficients calculated from the present sound-velocity measurements agree with literature values which were determined from PVT measurements by means of a Burnett method.

• Sponsoring Organization: USDOE
• OSTI ID: 471824
• Journal Information: International Journal of Thermophysics, Vol. 17, Issue 3; Other Information: PBD: May 1996
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
66 PHYSICS
36 MATERIALS SCIENCE
REFRIGERANTS
SPECIFIC HEAT
ACOUSTIC MEASUREMENTS
FLUORINATED ALIPHATIC HYDROCARBONS
TEMPERATURE DEPENDENCE
PRESSURE DEPENDENCE
EXPERIMENTAL DATA
VIRIAL EQUATION
VELOCITY
SOUND WAVES
TEMPERATURE RANGE 0273-0400 K
MEDIUM PRESSURE