Reference Correlation of the Thermal Conductivity of n-Heptane from the Triple Point to 600 K and up to 250 MPa

Abstract

This paper contains new, representative reference equations for the thermal conductivity of n-heptane. The equations are based in part upon a body of experimental data that have been critically assessed for internal consistency and for agreement with theory whenever possible. In the case of the dilute-gas thermal conductivity, a theoretically based correlation was adopted in order to extend the temperature range of the experimental data. Moreover, in the critical region, the experimentally observed enhancement of the thermal conductivity is well represented by theoretically based equations containing just one adjustable parameter. The correlations are applicable for the temperature range from the triple point to 600 K and pressures up to 250 MPa. The overall uncertainty (considered to be estimates of a combined expanded uncertainty with a coverage factor of 2) of the proposed correlation is estimated, for pressures less than 250 MPa and temperatures less than 600 K, to be less than 4%.

Preliminary models for viscosity, thermal conductivity, and surface tension of pure fluid constituents of selected diesel surrogate fuels

“…For example, the data of Briggs for benzene are 2 % to 9 % higher than the reference correlation (72), for toluene are 2 % to 15 % higher than Ref. (24), for methylcyclohexane are 2 % to 9 % higher than reference (61), for heptane are 0.5 % to 5 % higher than reference (73), and for ortho-xylene are 4 % to 13 % higher than the reference correlation (74). The deviations are always high, and become worse as the temperature increases.…”

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)

“…This correlation framework has already been applied to a number of industrially important fluids, including normal and para hydrogen [7], methylbenzene [8], SF 6 [9], benzene [10], hexane [11,15], heptane [12], ethanol [13], and methanol [14], and it will be applied to additional fluids as this IUPAC project continues. This paper demonstrates application of this correlation framework to the specific example of hexane.…”

“…In a series of recent papers, the project group has developed new reference correlations for the thermal conductivity of normal and para hydrogen [7], methylbenzene [8], SF 6 [9], benzene [10], hexane [11], heptane [12], ethanol [13], and methanol [14] covering a wide range of temperature and pressure. The project group has also reported its first viscosity correlation on hexane [15].…”

“…Fitting the effective cross-section, Eq. 14 is preferred for larger, complex molecules and has been used by the project group for heptane [12], ethanol [13], and methanol [14].…”

Fundamental Study of Wax Deposition Under Real Flow Conditions

“…Different groups (Kashiwagi et al, 1982;Mustafa et al, 1982;Menashe and Wakeham, 1982;Nieto de Castro et al, 1983;Calado et al, 1983;Prasad and Venart, 1984;Li et al, 1984;Wada et al, 1985;Assael et al, 1987;Tanaka et al, 1988;Prasad et al, 1989;Friend and Ingham, 1991;Vesovic et al, 1994;Watanabe and Seong, 2002;Perkins et al, 2002;Holmen et al, 2002;Sun et al, 2002;Huber and Perkins, 2005;Assael et al, 2013a;Assael et al, 2013b;Le Neindre et al, 2014;Vassiliou et al, 2015;Vélez et al, 2015a;Vélez et al, 2015b;Le Neindre, 2017;Le Neindre et al, 2018) have measured thermal conductivity of liquid and gas nalkanes from methane to n-eicosane at different temperatures and pressures, mostly by the transient hot wire method. On the other hand, experimental results are scarce for heavier n-alkanes.…”