Correlation for the Viscosity of Pentafluoroethane (R125) from the Triple Point to 500 K at Pressures up to 60 MPa.

Published

May 5, 2006

Author(s)

Marcia L. Huber, Arno R. Laesecke

Abstract

A correlation for the viscosity of pentafluorethane (R125) has been developed based on a compilation and critical assessment of the available experimental data. The correlation covers a wide range of fluid states, including the supercritical region. It is applicable from the triple point at 172.52 K to 500 K with pressures varying up to 60 MPa. The formulation includes a zero-density contribution, initial density dependence based on the Rainwater-Friend theory, and a residual contribution for higher densities that combines virial terms with a free-volume term, both temperature dependent. The estimated uncertainty of the viscosity correlation (coverage factor of two) is 3 % along the liquid-phase saturation boundary, 3 % in the compressed liquid phase at pressures to 60 MPa, and is 0.8 % in the vapor.

Citation

Industrial and Engineering Chemistry Research

Volume

45

Issue

12

Pub Type

Journals

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Keywords

correlation, modeling, pentafluoroethane, R125, refrigerant, solvent, viscosity

Citation

Huber, M. and Laesecke, A. (2006), Correlation for the Viscosity of Pentafluoroethane (R125) from the Triple Point to 500 K at Pressures up to 60 MPa., Industrial and Engineering Chemistry Research, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50246 (Accessed October 2, 2025)