Spherical Resonator for Vapor-Phase Speed of Sound and Measurements of 1,1,1,2,2,3,3-heptafluoro-3-methoxypropane (RE347mcc) and trans-1,3,3,3-tetrafluoropropene [R1234ze(E)]

Published

July 14, 2015

Author(s)

Richard A. Perkins, Mark O. McLinden

Abstract

We describe an apparatus to measure the speed of sound of gas samples at temperatures from 265 K to 500 K with pressures up to 40 MPa. The speed of sound is determined from the frequency of the three lowest-order radial resonance modes for the gas in a spherical cavity. The spherical resonator was contained in an isothermal copper block that was maintained at the temperature of interest by a multilayer thermostat with vacuum insulation. The dimensions of the spherical cavity were characterized as a function of temperature and pressure though calibration measurements with high-purity argon. The performance of the apparatus was demonstrated with measurements of high-purity methane and ethane. Measurements of the sound speed of 1,1,1,2,2,3,3-heptafluoro-3-methoxypropane (RE347mcc) are reported at temperatures from 325 K to 500 K with pressures up to 1.6 MPa. Measurements on trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) are reported at temperatures from 280 K to 420 K with pressures up to 2.8 MPa. The average combined expanded uncertainties of the measured sound speed for RE347mcc and R1234ze(E) are 0.029 % and 0.041 % respectively.

Citation

Journal of Chemical Thermodynamics

Volume

91

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.jct.2015.07.005

Keywords

ethane, 1, 1, 1, 2, 2, 3, 3-heptafluoro-3-methoxypropane, methane, sound speed, spherical resonator, trans-1, 3, 3, 3-tetrafluoropropene

Citation

Perkins, R. and McLinden, M. (2015), Spherical Resonator for Vapor-Phase Speed of Sound and Measurements of 1,1,1,2,2,3,3-heptafluoro-3-methoxypropane (RE347mcc) and trans-1,3,3,3-tetrafluoropropene [R1234ze(E)], Journal of Chemical Thermodynamics, [online], https://doi.org/10.1016/j.jct.2015.07.005 (Accessed October 9, 2025)