The transport properties of carbon dioxide

Abstract

Abstract Experimental viscosity, thermal conductivity, and self‐diffusivity data available in the literature for carbon dioxide have been critically reviewed and used to develop reduced state correlations of the transport properties for this substance. These correlations should apply to nonpolar compounds having critical compressibility factors approximately equal to that of carbon dioxide, z c = 0.275. In order to establish the dependence of these transport properties in the high pressure and liquid state regions, use has been made of relationships between the residual properties, μ‐μ*, k‐k*, and (P𝒟)*‐(P𝒟) and density. These residual quantities represent the differences between the values of the properties at any pressure and temperature and those at atmospheric pressure and the same temperature. These relationships also allow the determination of the values of the transport properties at the critical point. The resulting critical values along with the residual relationships enabled the construction of reduced state correlations for viscosity, thermal conductivity, and the product of self‐diffusivity and pressure for carbon dioxide. These correlations extend from the saturated vapor and liquid states to reduced temperatures of T R = 10 and reduced pressures of P R = 50. Comparisons made between values resulting from these correlations and corresponding experimental values, including the region of high pressure for both the gaseous and liquid states and the vicinity of the critical point, produced an average deviation of 2.0% for viscosity, 1.4% for thermal conductivity, and 5.9% for self‐diffusivity.