Abstract
Viscosity measurements have been carried out with a falling-cylinder instrument in the compressed liquid and supercritical regions of the hydrofluorocarbon 1,1,1,2-tetrafluoroethane (R134a). A highly pure sample was used. The measurement region at temperatures from 293.15 K to 438.15 K with pressures from 10 MPa to 400 MPa extends the existing data range substantially. With estimated uncertainties of 3.5 % for viscosity, the greater of 1 MPa or 0.5 % for pressure, and 0.4 K for temperature, the new results can be used to reconcile inconsistencies between literature data sets. They also provide a test of the extrapolation capability of existing viscosity correlations for this fluid and enable the development of a more accurate and wider ranging formulation.
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Laesecke, A., Bair, S. High-Pressure Viscosity Measurements of 1,1,1,2-Tetrafluoroethane. Int J Thermophys 32, 925–941 (2011). https://doi.org/10.1007/s10765-011-0978-y
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DOI: https://doi.org/10.1007/s10765-011-0978-y