Viscosities of a series of gaseous fluorocarbons at 25 °C

Abstract

Viscosities have been measured at 25 °C for methane, ethane, and most of the fluorinated compounds of those species; some viscosities are also reported for several other simple hydrocarbons and fluorocarbons. In the case of the two pairs of configurational isomers of ethane, quite large differences in the viscosities of each species of a pair are apparent.

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

“…Lennard-Jones parameters were estimated with a method described in Huber and Ely (Huber & Ely, 1992b). Only one vapor-phase viscosity point was found (Dunlop, 1994), and this was used along with the liquid-phase viscosity data of Geller (V.Z. Geller, 1980) to obtain the coefficients in Table 2.…”

“…Lennard-Jones parameters were calculated by the method of Chung et al (Chung et al, 1988), values are presented in Table 1. Gas-phase data of Dunlop (Dunlop, 1994) and Lambert et al (Lambert et al, 1955) and liquid-phase data of Golubev (Golubev, 1959) , and Neduzij and Khmara (Neduzij & Khmara, 1968) were used to obtain the coefficients in Table 2. Deviations with viscosity data as a function of temperature are shown in Figure 60.…”

Gas Viscosity of Difluoromethane from 298.15 to 423.15 K and up to 10 MPa

“…Difluoromethane (HFC-32) has no ozone depletion potential (ODP) since there are no chlorine atoms in the molecule and has been considered as a substitute for HCFC-22. Various thermophysical properties of HFC-32 have recently been measured (Defibaugh et al, 1994;Holcomb et al, 1993;Kuwabara et al, 1992Kuwabara et al, , 1995Malbrunot et al, 1968; McLinden, 1990; Nishimura et al, 1992;Oliveira et al, 1993;Outcalt and McLinden, 1994;Qian et al, 1993;Ripple and Matar, 1993;Weber and Goodwin, 1993;Weber and Silva, 1994;Widiatmo et al, 1994), but its viscosity in the gas phase has been hardly measured (Dunlop, 1994). In this paper, the viscosity and density of HFC-32 gas were measured from 298.15 to 423.15 K at pressures up to 10 MPa.…”

Viscosities of Liquid Fluorocompounds

“…29 This behavior was also previously observed for the gaseous hydrocarbonated and perfluorinated methane and propane. 30 In fact, the higher viscosities of PFCs related to their hydrocarbon analogues are the direct result of the PFC's higher molecular weight. 22 The measured values of n-perfluoroalkane dynamic viscosities show that they are strongly dependent on the carbon number, similar to what is observed for hydrocarbons, but with a more pronounced temperature dependency, which is a reflection of their lower intermolecular forces when compared with the corresponding nonfluorinated molecules.…”