Reference Correlations for the Viscosity and Thermal Conductivity of n-Undecane

Published

September 26, 2017

Author(s)

Marc J. Assael, T.B. Papalas, Marcia L. Huber

Abstract

This paper presents new wide-ranging correlations for the viscosity and thermal conductivity of n-undecane based on critically evaluated experimental data. The correlations are designed to be used with a recently published equation of state that is valid from the triple point to 700 K, at pressures up to 500 MPa, with densities below 776.86 kg m-3. The estimated uncertainty for the dilute-gas viscosity is 2.4%, and the estimated uncertainty for viscosity in the liquid phase for pressures up to 60 MPa over the temperature range 260 K to 520 K is 5.7%. The correlation behaves in a smooth manner over the entire range of validity of the equation of state, but care should be taken when using the correlation outside of its validated range and uncertainties will be larger. The estimated uncertainty is 3% for the thermal conductivity of the low-density gas, and 3% for the liquid over the temperature range from 284 K to 677 K at pressures up to 400 MPa. The thermal conductivity correlation behaves in a physically reasonable manner when extrapolated to the full range of the equation of state, but the uncertainties will be larger outside of the validated range, and also in the critical region.

Citation

J. Phys. & Chem. Ref. Data (JPCRD) -

Volume

46

Issue

3

NIST Pub Series

J. Phys. & Chem. Ref. Data (JPCRD)

Pub Type

NIST Pubs

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DOI Link

Keywords

critical phenomena, thermal conductivity, transport properties, viscosity, n-undecane. thermal conductivity, transport properties, viscosity, n-undecane

Citation

Assael, M. , Papalas, T. and Huber, M. (2017), Reference Correlations for the Viscosity and Thermal Conductivity of n-Undecane, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.1063/1.4996885 (Accessed October 14, 2025)