Reference Correlation of the Viscosity of n-Hexane from the Triple Point to 600 K and up to 100 MPa

Abstract

This paper contains new, representative reference equations for the viscosity of n-hexane. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory whenever possible. The correlations are valid from the triple point to 600 K, and at pressures up to 100 MPa. We estimate the expanded uncertainty at a 95% confidence level to be 2% for the liquid phase at temperatures from the triple point to 450 K and pressures to 100 MPa. For the liquid at 450–600 K at pressures to 100 MPa, the expanded uncertainty at the 95% confidence level is 6%, and is 0.3% for the low-density gas at pressures to 0.3 MPa.

Reference Correlation of the Viscosity of meta-Xylene from 273 to 673 K and up to 200 MPa

“…94 The enhancement is significant only in a relative narrow window in temperature and density round the critical point. 2,7 Based on the previous studies, 3,5,6,[8][9][10][11][12][13][15][16][17][18] the viscosity critical enhancement of m-xylene is taken as zero. The total lack of industrial applications of m-xylene near its critical temperature and the existence of an only single experimental viscosity datum 39 further supports this choice.…”

“…This information is complemented with guidance available from theory to produce accurate, consistent, and theoretically sound representations of the transport properties over the widest range of thermodynamic states possible. The first fluid studied in this program was carbon dioxide 2 and since then a plethora of viscosity correlations have been produced, using the same philosophy, covering among others: simple fluids, 3-5 alkanes [6][7][8][9][10][11][12][13] and water. 14 Recently the work has been extended to cyclic and aromatic hydrocarbons.…”

Reference correlations for the viscosity and thermal conductivity of fluids over an extended range of conditions: hexane in the vapor, liquid, and supercritical regions (IUPAC Technical Report)

“…The project group has also reported its first viscosity correlation on hexane [15]. In the case of thermal conductivity, several alternative theoretical models have been used successfully for the dilute gas.…”

“…4 and the scaling parameters σ and ε/k B . Equations 3-8 Table 1 Primary viscosity measurements and fit statistics for hexane [15]. The relative expanded uncertainty u(η) of each data set is at 95 % confidence.…”

“…The correlation for the viscosity of hexane [15] was developed from literature data that were selected and evaluated following the procedures discussed here. The primary data for the viscosity of hexane, selected according to the aforementioned criteria and shown in Table 1, were fit to the expression given in Eq.…”