Viscosity of Fluorinated Propane Isomers. 2. Measurements of Three Compounds and Model Comparisons

Abstract

Viscosity data are reported for three fluorinated propane isomers in the saturated-liquid state over a combined temperature range from 248 to 348 K. The compounds are -heptafluoropropane (R227ea). The measurements were carried out in sealed gravitational capillary viscometers. The estimated uncertainty of the measurements is (3.4%. Including earlier viscosity measurements on 1,1,1,3,3,3-hexafluoropropane (R236fa) and 1,1,1,2,3,3-hexafluoropropane (R236ea), the viscosity data of all five fluids were correlated within their experimental uncertainty in terms of the rough hard-sphere model. The experimental data were also compared with predictions of the extended corresponding-states method in NIST Standard Reference Database 23 (REFPROP). Deviations range between -20 and 15%.

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

“…Lennard-Jones parameters were estimated with the method of Chung et al (Chung et al, 1988) with parameters as given in Table 1. The saturated liquid data of Laesecke and Hafer (Laesecke & Hafer, 1998) were used to obtain the coefficients in Table 2, and deviations are shown in Figure 122. No data off of the saturation boundary were found, or in the gas phase.…”

Experimental Determination of Thermophysical Properties of Working Fluids for ORC Applications

“…Capillary viscometer was used by Laesecke et al [57] to determine the dynamic viscosity of liquid R245fa at saturation. Figure 20 presents the results and comparison with prediction using REFPROP 10.0.…”

Thermal Diffusivity, Sound Speed, Viscosity, and Surface Tension of R227ea (1,1,1,2,3,3,3-Heptafluoropropane)

“…Liu et al [23] estimated an uncertainty of less than 3% in their data, which were obtained with a capillary viscometer. Furthermore, experimental data from Laesecke and Hafer [24] are also compared, originating from capillary viscometers of different types and comprising a measurement uncertainty of ±3.4%, according to Ref. 24.…”

“…Furthermore, experimental data from Laesecke and Hafer [24] are also compared, originating from capillary viscometers of different types and comprising a measurement uncertainty of ±3.4%, according to Ref. 24. Figure 4 also contains the information provided by the standard reference database program REFPROP [16], which calculates the viscosity of R227ea based on the experimental data from Laesecke and Hafer [24].…”

“…24. Figure 4 also contains the information provided by the standard reference database program REFPROP [16], which calculates the viscosity of R227ea based on the experimental data from Laesecke and Hafer [24]. Within the combined uncertainties, good agreement of all experimental data sets for R227ea can be established.…”