Measurement of the viscosity of HFC 134a in the temperature range 213 423 K and at pressures up to 30 MPa

摘要: The viscosity of HFC 134a was measured over the range temperatures from 213 to 423 K and pressures up 30 MPa. experimental method that capillary flow a closed-circuit high-pressure viscometer used. sample fluid circulated through stainless-steel highpressure plunger system. constant calibrated against reference standard, pure water. calculated rate, pressure drop at capillary, using Hagen-Poiseuille equation. Measurements were made total 39 points on eight isotherms. measurement uncertainty viscosities estimated as ±1.3%. Based present results, an empirical equation for has been correlated. saturation line by compares with data in other previous studies. There are rather considerable differences among these measurements. Comparisons those CFC 12 show is similar magnitude around 300 but higher lower temperatures. gradients two corresponding substances entire temperature range.