The viscosities of gaseous bromttrifluoromethane (R13B1), 1-chloro-1,1-difluoroethane (R142b), and 1,1-difluoroethane (R152a) were measured with an oscillating disk viscometer of the Maxwell type at 273.15—448.15 K up to 10 MPa for R13B1 and at 298.15—423.15 K up to 5 MPa for R142b and R152a. Two empirical equations were obtained; one is for the viscosity at atmospheric pressure as a function of temperature, and the other is for the viscosity In the whole range of the present measurement as a function of temperature and density. The intermolecular force constants of Stockmayer 12-6-3 potential were determined from the temperature dependence of the viscosity at atmospheric pressure as follows: ε/k σ = 235 K, σ = 0.506 nm, and δ = 0.058 for R13B1; ε/k = 362 K, < σ = 0.499 nm, and δ = 0.36 for R142b; ε/k = 312 K, σ = 0.463 nm, and δ = 0.62 for R152a.
ASJC Scopus subject areas
- Chemical Engineering(all)