Speed of sound in the gaseous phase for HFO1234yf from 308 K to 370 K at pressures up to 1 MPa

Experimental Speed of Sound for 3,3,3-Trifluoropropene (R-1243zf) in Gaseous Phase Measured with Cylindrical Resonator

“…The experimental system was rebuilt inheriting the advantages of one for the accurate measurement of the thermodynamic temperature . The accuracy of the system has also been verified in measurements of gaseous speed of sound in many other alternative working fluids. − A detailed description of the measurement principle and the experimental apparatus has been given in our previous publications. − Here, only a brief introduction is provided in the following.…”

“…The acoustic resonance technique is one of the predominant methods for the measurement of the speed of sound in the gaseous phase. Our group has been devoted to measurements of the speed of sound of working fluids with the acoustic resonance method, which is a steady state method, and has published several papers of the experimental speed of sound in alternative refrigerants. − In the present work, the speed of sound in R-1243zf was measured by means of a fixed-path cylindrical resonator. Measurements were taken along nine quasi-isochoric lines in the temperature range of 313 to 363 K and pressure range of 170 to 983 kPa.…”

Acoustic Properties and Derived Virial Coefficients for Gaseous Mixtures of 2,3,3,3-Tetrafluoropropene (R1234yf) + Hexafluoropropylene (R1216)

“…The fixed-path acoustic resonance method, which was comprehensively introduced in the study by Moldover, was selected as the experimental method to measure the speed of sound. The method is currently one of the most accurate for measuring the gaseous speed of sound, and it has been used for determining the Boltzmann constant ( k B ) and redefining the thermodynamic temperature reference in SI. , Our previous studies demonstrated that this method is suitable for measuring the speed of sound in HFOs and their blends. ,− Briefly, an acoustic standing wave is formed in a fixed cylindrical or spherical cavity, and then the speed of sound is calculated using the measured resonance frequency and the calibrated cavity length according to the wave equation. For a cylindrical cavity, the speed of sound ( w ) is calculated according to eq . w = 2 π ( f N − ∑ j normalΔ f j ) / true( l π L true) 2 + true( χ m n a true) 2 where f N is the measured resonant frequency, Δ f j is the shift in the measured resonant frequency from the ideal frequency owing to the nonidealities, l ,| m |, n = (0, 1, 2···) are characteristic numbers of the axial, angular, and radial vibrations, respectively, indicating the number of half-waves in each direction, L and a are the length and radius of the resonant cavity, respectively, and χ mn is the zeros of the first derivative of the cylindrical Bessel function.…”

Quantification of Dipolar Contribution and Modeling of Green Polar Fluids with the Polar Cubic-Plus-Association Equation of State

“…For the effective applications of these green polar fluids in industry, the knowledge of the thermophysical properties is a prerequisite. The feasible approaches to obtain the thermophysical property data include experimental measurements, , molecule simulations, , and model estimations. , Among these methods, the experiment is generally the most reliable way to get accurate data, although there may be some deviations between different data sources (typically in the case of ILs) . However, as the experiment can only give discrete values and often may be time-consuming and costly, the industrial needs cannot be satisfactorily met only with experiment.…”