Reference Correlation of the Thermal Conductivity of Nitrogen from the Triple Point to High Temperatures and Pressures

Published

February 13, 2025

Author(s)

Sofia Sotiriadou, Marc Assael, Marcia Huber

Abstract

A new wide-ranging correlation for the thermal conductivity of nitrogen, based on the most recent ab initio dilute gas theoretical calculations, a simplified crossover critical enhancement contribution, and critically evaluated experimental data, is presented. The correlation is designed to be used with a high-accuracy Helmholtz equation of state over the range of temperatures from the triple-point temperature to 1000 K, and at pressures up to 2200 MPa. The estimated expanded uncertainty (at the 95% confidence level) in the range of validity of the correlation ranges from a minimum of 1% in the gas phase for temperatures from 102 K to 700 K at pressures up to 1 MPa, to 4% in the high temperature, high pressure region covering 500 K < T < 744 K at pressures from 1 MPa to 40 MPa. In the gas and supercritical region 112 K < T < 475 K for pressures 1 MPa < p < 1000 MPa the estimated uncertainty is 2.2%, and for the liquid from 81 K to 122 K at pressures up to 70 MPa the estimated uncertainty is 3%. The correlation behaves in a physically reasonable manner when extrapolated to temperatures below the triple point and is suitable for use in certain corresponding states applications, however care should be taken when using the correlation outside of the experimentally validated range.

Citation

International Journal of Thermophysics

Volume

46

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s10765-025-03516-6

Local Download

Keywords

thermal conductivity, transport properties, nitrogen

Citation

Sotiriadou, S. , Assael, M. and Huber, M. (2025), Reference Correlation of the Thermal Conductivity of Nitrogen from the Triple Point to High Temperatures and Pressures, International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-025-03516-6, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959257 (Accessed April 19, 2025)