Liquid thermal conductivities of organic compounds and petroleum fractions

Abstract

Liquid thermal conductivities of 29 organic compounds and 15 petroleum fractions have been measured in a transient, relative apparatus of the hot wire type between 20°and 120°C at a pressure of 7.5 atm.Liquid thermal conductivity is a physical property difficult to measure accurately. Natural convection caused by the imposed temperature difference tends to make experimental values too high. It is known now that many data in reference books and handbooks are in error on the high side by 20% or more.Of all organic compounds, toluene has been the one studied most for thermal conductivity.

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

“…The estimated uncertainty in the gas phase is also 5 %. For thermal conductivity, the gas-phase data of Medzhidov and Safarov ______________________________________________________________________________________________________ (Medzhidov & Safarov, 1983) and the liquid-phase data of Mallan et al (Mallan, Michaelian, & Lockhart, 1972) and Qun-Fang et al (Qun-Fang et al, 1997) were used to obtain the coefficients in Table 3. Parameters for the critical enhancement are presented in Table 4.…”

Thermal conductivity correlations for minor constituent fluids in natural gas: n-octane, n-nonane and n-decane

“…These wide-range data sets [62,65] were made with a steadystate technique and agree well with the recent transient hotwire measurements at more moderate temperatures. There is also the characteristic change in slope of the deviations with respect to temperature and density for some data sets, such as those of Brykov and Mukhamedzyanov [26] and Mallan et al [33], in the liquid phase from 300 to 320 K. This is not as distinct as it was for n-octane and n-nonane but still seems to be present.…”

“…These wide-range data sets [22,23,36] were made with steady-state techniques and agree well with the recent transient hot-wire measurements at more moderate temperatures. It is apparent in both figures that the temperature and density dependencies of measurements by various researchers differ from each other and the correlation near 320 K. The most dramatic examples are the data sets of Mukhamedzyanov et al [34,35] and Nieto de Castro et al [38,39] compared to the data sets of Brykov and Mukhamedzyanov [26], Calado et al [27], and Mallan et al [33]. It is noted that the primary dilute vapor data of Carmichael and Sage [21] have a temperature dependence that differs from that of the correlation, with a maximum deviation of 4.9%.…”

“…The data of Mustafaev [22] are the only source for thermal conductivity at high temperatures and this is only for vapor at pressures of 1 bar. There are no liquid or high-density gas data available at temperatures above 460 K. As for n-octane, it is apparent in both figures that the temperature and density dependence of measurements by various researchers differ from each other and Table 5 Summary of experimental data and comparison of the correlation with primary and selected secondary experimental thermal conductivity data for n-decane from the correlation near 320 K. The most dramatic examples are the data sets of Nieto de Castro et al [38] compared to the data sets of Calado et al [27] and Mallan et al [33]. However, for n-nonane there is a clear maximum in the absolute deviations (with slope change in terms of both temperature and density) for the data of Mukhamedzyanov et al [56] and Brykov and Mukhamedzyanov [26] at these conditions.…”

Development of a general model for determination of thermal conductivity of liquid chemical compounds at atmospheric pressure

“…Accurate measurements of thermal conductivity are not straightforward and need special care because of the possible presence of convective currents and heat losses during its experimental determination. Thus, the uncertainty concerning the existing experimental data is almost larger than that of other chemical compounds …”