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

Download Paper

Local Download

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 April 23, 2024)