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Reference Correlation for the Viscosity of 1,1,1,2-tetrafluoroethane (R-134a) from the Triple Point to 438 K and up to 70 MPa

Published

Author(s)

Danai Velliadou, Marc Assael, Marcia L. Huber

Abstract

We present a new wide-ranging correlation for the viscosity of 1,1,1,2-tetrafluoroethane (R-134a) based on critically evaluated experimental data. The correlation is designed to be used with densities from an existing equation of state, valid from the triple point to 438 K, at pressures up to 70 MPa. The estimated uncertainty (at the 95% confidence level) for the viscosity varies depending on the temperature and pressure, from a low of 0.2 % in the dilute-gas range to 4 %. The correlation behaves in a physically reasonable manner when extrapolated to pressures above 70 MPa. Comparisons with experimental data at pressures to 400 MPa are given. However, care should be taken when using the correlation outside of the validated range of the equation of state.
Citation
International Journal of Thermophysics
Volume
43

Keywords

transport properties, viscosity, 1, 1, 1, 2-tetrafluoroethane, R134a, HFC-134a.

Citation

Velliadou, D. , Assael, M. and Huber, M. (2022), Reference Correlation for the Viscosity of 1,1,1,2-tetrafluoroethane (R-134a) from the Triple Point to 438 K and up to 70 MPa, International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-022-03029-6, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934107 (Accessed May 21, 2022)
Created May 11, 2022