Speed of sound in gaseous cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) between 307 K and 420 K

TL;DR

This study measures the speed of sound in gaseous R1234ze(Z) over a range of temperatures and pressures, providing precise data for thermodynamic properties and validating a fundamental equation of state.

Contribution

The paper provides highly accurate measurements of the speed of sound and related thermodynamic properties of R1234ze(Z), supporting the development of its fundamental equation of state.

Findings

Speed of sound measured with ±0.02% accuracy.

Ideal-gas heat capacity ratio determined with ±0.25% accuracy.

Results are consistent with theoretical equation of state predictions.

Abstract

Measurements of the speed of sound in gaseous cis-1,3,3,3-tetrafluoroprop-1-ene, (R1234ze(Z)), are presented. The measurements were performed using a quasi-spherical acoustic resonator at temperatures between 307 K and 420 K and pressures up to 1.8 MPa. Ideal-gas heat capacities and acoustic virial coefficients over the same temperature range were directly calculated from the results. The relative accuracy of our determinations of the speed of sound $w$($p$,$T$) of R1234ze(Z) was approximately $\pm$ 0.02%. The accuracy of the determination of the ideal gas heat capacity ratio ${\gamma}^{0}$($T$) was approximately $\pm$ 0.25%. These data were found to be mostly consistent with the predictions of a fundamental equation of state of R1234ze(Z).