Multi-property evaluation for a gas sample based on the acoustic and electromagnetic resonances measurement in a cylindrical cavity. (August 2021)

• Record Type: Journal Article
• Authors: Kano, Yuya
• Is Part Of: Journal of chemical thermodynamics. Volume 159(2021)
• Publication Date: 2021-08
• Subjects: Sound speed -- Relative permittivity -- Density -- Ideal gas specific heat capacity -- Dipole moment -- Molecular polarizability; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2021.106448
• Languages: English
• ISSNs: 0021-9614

Abstract

Highlights: A multi-property evaluation method for a gas sample based on the sound speed and relative permittivity measurements was proposed. Validity and reliability of the experimental apparatus using a cylindrical acoustic-electromagnetic resonator was proved by measurement results for Ar. The ideal-gas specific heat capacity was derived from the sound speed data through the acoustic-virial equation. The ideal-gas molar polarization, dipole moment, molecular polarizability, and density were derived from the relative permittivity data through the dielectric-virial equation. Abstract: This study proposes a multi-property evaluation method for a gas sample on the basis of sound speed and relative permittivity measurements by using a cylindrical acoustic-electromagnetic resonator. Validity and reliability of the present apparatus were confirmed from the measurement result for Ar with the relative standard uncertainties of 2 × 10 −4 for the sound speed and 4 × 10 −6 for the relative permittivity. The sound speed and the relative permittivity measurements for trans -1-chloro-3, 3, 3-trifluoropropene, which is known as R1233zd(E), were carried out in the wide temperature and pressure ranges to demonstrate the multi-property evaluation for a polar molecular sample. Firstly, specific heat capacity and molar polarization in the ideal-gas state were derived from the sound speed and the relative permittivity data, respectively, based on the acoustic- and the dielectric-virial equations. Secondly, linear regression of the ideal-gas molar polarization and temperature data leaded information of dipole moment and molecular polarizability in accordance with Debye equation. The density-virial coefficients were deduced by use of an empirical correlation with the determined dipole moment on the basis of the corresponding states principle so that the acoustic- and the dielectric-virial coefficients were separately determined from polynomial regression analysis of the sound speed and the relative permittivity data, respectively. Finally, the relative permittivity data in combination with the determined dielectric-virial coefficients yield the value of density. The acquired multi-property data for R1233zd(E) were compared with the existing equation of state or reference model.