Viscosity of gaseous HFC-125 (pentafluoroethane) under high pressures

This paper reports experimental results for the viscosity of gaseous HFC-12 5 (pentafluoroethane) under high pressures. The measurements were carried o ut with an oscillating-disk viscometer of the Maxwell type at temperatures from 298.15 to 423.15 K and at pressures up to the saturated vapor pressure s at each temperature at subcritical conditions or up to 9 MPa at supercrit ical temperatures. Intermolecular scaling parameters of HFC-125 for the ext ended corresponding states were determined from the viscosity data at 0.1 M Pa. An empirical viscosity equation is proposed to interpolate the present experimental results as a function of temperature and density.