Reference Correlation for the Viscosity of Difluoromethane (R-32) from the Triple Point to 425 K and up to 70 MPa

Published

July 4, 2022

Author(s)

Danai Velliadou, Konstantinos Antoniadis, Marc Assael, Marcia L. Huber

Abstract

We present a new wide-ranging correlation expressed in terms of temperature and density for the viscosity of difluoromethane (R-32) based on critically evaluated experimental data. The correlation is designed to be used with an existing equation of state from the triple point to 425 K and at pressures up to 70 MPa. Comparisons with experimental data over the temperature range 220 to 425 K at pressures up to 70 MPa indicate the correlation has an estimated uncertainty (at the 95% confidence level) of 3.4% in this region, and 2% for the vapor at atmospheric pressure. The correlation also behaves in a physically reasonable manner and may be extrapolated up to 350 MPa, but caution is advised in this region since it requires extrapolation of the equation of state.

Citation

International Journal of Thermophysics

Volume

43

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s10765-022-03050-9

Local Download

Keywords

difluoromethane, HFC-32, transport properties, viscosity, R-32

Citation

Velliadou, D. , Antoniadis, K. , Assael, M. and Huber, M. (2022), Reference Correlation for the Viscosity of Difluoromethane (R-32) from the Triple Point to 425 K and up to 70 MPa, International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-022-03050-9, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934726 (Accessed October 9, 2025)