Volume 20, Issue 2, March 1991
Index of content:
20(1991); http://dx.doi.org/10.1063/1.555880View Description Hide Description
This publication contains evaluated and estimated data on the kinetics of reactions involving propene and allyl radical and various small inorganic and organic species which are of importance for the proper understanding of the early stages of propene and the intermediate stages of propane and isobutane combustion and pyrolysis. It is meant to be used in conjunction with the kinetic data given in earlier publications, which is of direct pertinence to the understanding of methane, ethane, methanol, propane and isobutane pyrolysis and combustion, but which also contains a large volume of data that are applicable to the propene system. The temperature range covered is 300–2500 K and the density range 1×101 6 to 1×102 1 molecules cm− 3.
20(1991); http://dx.doi.org/10.1063/1.555881View Description Hide Description
New correlations for the thermophysical properties of fluid ethane are presented. The correlations are based on a critical evaluation of the available experimental data and have been developed to represent these data over a broad range of the state variables. Estimates for the accuracy of the equations and comparisons with measured properties are given. The reasons for this new study of ethane include significant new and accurate data and improvements in the correlating functions which allow increased accuracy of the correlations—especially in the extended critical region. Short tables of the thermophysical properties of ethane are included. This study complements an earlier study of methane and uses the same correlating equations and format. For the thermodynamic properties, a classical equation for the molar Helmholtz energy, which contains terms multiplied by the exponential of the quadratic and quartic powers of the system density, is used. The resulting equation of state is accurate from about 90 K to 625 K for pressures less than 70 MPa and was developed by considering P V T, second virial coefficient, heat capacity, and sound speed data. Tables of coefficients and equations are presented to allow the calculation of these and other thermodynamic quantities. Ancillary equations for properties along the liquid‐vapor phase boundary, which are consistent with the equation of state and lowest order scaling theory, are also given. For the viscosity of ethane, a contribution based on a theoretical fit of low‐density data is combined with an empirical representation of the excess contribution. The approximate range of the resulting correlation is 90 K to 500 K for pressures less than 60 MPa. The correlation for the thermal conductivity includes a theoretically based expression for the critical enhancement; the range for the resulting correlation is about 90 K to 600 K for pressures below 70 MPa.
Heat capacity and other thermodynamic properties of linear macromolecules X. Update of the ATHAS 1980 Data Bank20(1991); http://dx.doi.org/10.1063/1.555882View Description Hide Description
The prior published ATHAS 1980 Data Bank of experimental heat capacities of linear macromolecules that included critically reviewed material on almost 100 polymers is updated. In addition, the data bank has been computerized so that future updates can be made continuously, and new print‐outs or computer files will be available from the authors from, 1990 on.
20(1991); http://dx.doi.org/10.1063/1.555883View Description Hide Description
Heat capacities of liquid C1 to C1 8 n‐alkanes measured by calorimetric methods have been compiled and evaluated. The selected experimental data were fitted as a function of temperature with cubic splines using weighted least squares minimization. The parameters of the cubic spline polynomials and the recommended values for heat capacities are presented. Heat capacities were also fitted by a quasipolynomial equation permitting extrapolation of heat capacities outside the temperature range of experimental values.