The Thermal Conductivity of n‐Nonane and n‐Undecane at Pressures up to 500 MPa in the Temperature Range 35–90°C

Abstract

AbstractThe paper presents new measurements of the thermal conductivity of two normal alkanes, n‐nonane, and n‐undecane, in the liquid phase. The measurements have been carried out within the temperature range 35 to 90°C and over the pressure range 50–500 MPa in a transient hot‐wire instrument. The experimental data, which have been corrected for the effects of radiation absorption, have an estimated uncertainty of ±0.7%. — A heuristic modification of the Enskog theory of transport processes in dense fluids is proposed, which leads to a simple means of representing the entire body of thermal conductivity data for each fluid with an accuracy commensurate with that of the measurements themselves. For each fluid the only temperature dependent parameter of the correlation scheme is a density independent core volume. It is therefore possible to predict the density dependence of the thermal conductivity of the fluid at any temperature from a single measurement at just one density.