Thermal‐conductivity–reduced‐state correlation for the inert gases

Abstract

The fragmentary thermal-conductivity data for argon available in the literature have been correlated by use of a residual thermal conductivity k -k* vs. density p relationship.This correlation produced a unique continuous curve which was found to be singularly independent of temperature and pressure for both gaseous-and liquid-state data. From low-pressure thermal-conductivity values k* and the relationship given above, it is possible to determine thermal conductivities at any condition of temperature and pressure for which a corresponding density is available. This procedure was used to calculate reliable thermal conductivities k for high-pressure regions where experimental data were lacking.In a similar manner the critical thermal conductivity A, for argon was established directly from the critical density and the quantity kT,*. The k, value permitted the calculation of reduced thermal conductivities kR w d made possible the construction of an extensive reduced-state chart. Although this correlation was developed mainly from data for argon, it was found to apply equally as well to the other inert gases as postulated from the theory of corresponding states.A comparison of thermal conductivities calculated from the reduced-state plot with over 200 experimental points produced an average deviation of l.S'% for all the inert gases. This chart was also found applicable to the diatomic gases and their mixtures but produced significant deviations for substances having more than two atoms per molecule.

Thermal conductivity: Reduced state correlation for ethylene and its application to gaseous aliphatic hydrocarbons and their derivatives at moderate pressures

“…In view of these results it is reasonable to expect that each family of molecularly similar substances will follow a corresponding states behavior and therefore should correlate on a single reduced-state plot. Previous correlations for the inert gases (19) and methane ( 2 0 ) and the present correlation for the aliphatic hydrocarbons support this conclusion. In the future it is felt that this approach should be utilized for other families of substances in order to provide a comprehensive summary of transport properties in general.…”

“…In this investigation the slope of the moderate pressure isobar, log ko,/lOg T , is constant. For the inert gases (19) this ratio decreases with an increase in temperature, while for methane ( 2 0 ) an opposite behavior has been reported. In view of these results it is reasonable to expect that each family of molecularly similar substances will follow a corresponding states behavior and therefore should correlate on a single reduced-state plot.…”

“…In this study the true thermal conductivity at the critical point is determined only for ethylene by following the procedure outlined in the study for the inert gases (19).…”

The transport properties of carbon dioxide

“…For these gases Shimotake and Thodos (48) found that good agreement exists between experimental viscosity values and the results obtained with Equation (4). For thermal conductivity Owens and Thodos (37) found that values calculated with Equation (5) were consistent with experimental measurements for the monatomic gases. For polyatomic gases the Eucken correction factor (9) must be applied to Equation (5) to account for the rotational and vibrational energy contributions.…”

Thermal conductivity of diatomic gases: Liquid and gaseous states

“…Other methods (19) are too generalized to be accurate for specific substances. To overcome these lhitations, thermal-conductivity and viscosity correlations have been developed from experimental data specific to families of substances (7, 42,48,61). Such treatment permits the prediction of accurate values over wide ranges of temperature and pressure for both the gaseous and liquid states.…”