Volume 19, Issue 5, September 1990
Index of content:
19(1990); http://dx.doi.org/10.1063/1.555863View Description Hide Description
Supplementing the recently completed IUPAC tables for the thermodynamic properties of oxygen, this paper presents a data evaluation of the transport properties,viscosity, and thermal conductivity. From a comprehensive literature survey the available data have been complied, and their quality was assessed. Selected measurements were correlated to generate skeleton tables of the most reliable data along the vapor‐liquid coexistence curve and for the fluid region at pressures from 0.1 to 100 MPa and at temperatures from 70 to 1400 K. The set of correlations which was developed includes residual concept formulations as well as transport equations of state. These allow the direct calculation of viscosities and thermal conductivities from pressure and temperature as input variables. The simplified crossover model was employed to represent the enhancement of the thermal conductivity in the critical region.
19(1990); http://dx.doi.org/10.1063/1.555864View Description Hide Description
We present a complete set of easily programmable computer algorithms, and a set of numerical tables, for the thermal conductivities of the nine gases: N2, O2, NO, CO, CO2, N2O, CH4, CF4, and SF6. This complements our earlier corresponding‐states work on the equilibrium and transport properties of these gases [J. Phys. Chem. Ref. Data 1 6, 445 (1987); 1 7, 255 (1988)]. The results embrace the temperature range from T*=k T/ε=1 up to a nominal upper limit of 3000 K. The accuracy achieved is specified, and the correlation can be used in a predictive mode.
19(1990); http://dx.doi.org/10.1063/1.555865View Description Hide Description
The paper presents accurate representation of the thermal conductivity of methane and tetrafluoromethane in the limit of zero density. The theoretically‐based correlations provided are valid for the temperature range 120–1000 K and 280–750 K for methane and tetrafluoromethane respectively. The methane correlations has associated uncertainties of ±2% between 300 and 500 K, rising to ±2.5% at the low, and ±4% at the high, temperature extremes. The tetrafluoromethane correlation has uncertainties of 1% between 280 K and 450 K, rising to ±5% at the highest temperature. A comparison with some earlier correlations is given. The paper also includes an improved correlation for the temperature dependence of the zero‐density viscosity of tetrafluoromethane.
Coupled Phase Diagram‐Thermodynamic Analysis of the 24 Binary Systems, A2CO3‐AX and A2SO4‐AX Where A=Li, Na, K and X=Cl, F, NO3, OH19(1990); http://dx.doi.org/10.1063/1.555866View Description Hide Description
A complete bibliographic search for all thermodynamic and phase diagram data on the 24 binary system A2CO3‐AX and A2SO4‐AX (where A=Li, Na, K, and X=F, Cl, OH, NO3) was carried out. A computer‐assisted simultaneous evaluation of all data was performed in order to obtain optimized equations for the thermodynamic properties of the phases. A re‐evaluation of the thermodynamic data for several of the pure salts was also carried out. The optimized thermodynamic parameters are reported as well as the phase diagrams calculated from these equations. These are considered to be the best evaluated phase diagrams which can be deduced from the data currently available. Estimated error limits of all binary assessments are given.
Equilibrium and Transport Properties of Gas Mixtures at Low Density: Eleven Polyatomic Gases and Five Noble Gases19(1990); http://dx.doi.org/10.1063/1.555867View Description Hide Description
This paper uses results from statistical‐mechanical theory, applied through a combination of an extended principle of corresponding states with some knowledge of intermolecular potentials, to the calculation of the transport and equilibrium properties of gas mixtures at low density. The gases involved are: N2, O2, NO, CO, CO2, N2O, CH4, CF4, SF6, C2H4, C2H6, and He, Ar, Ne, Kr, Xe. The properties included are: second virial coefficient, viscosity,diffusion, and thermal diffusion, but not thermal conductivity. The calculations are internally, thermodynamically consistent and the resulting algorithms, which are fully programmable, operate in an entirely predictive mode by means of validated combination rules. This paper is a sequel to one on the five noble gases and all their possible mixtures and a second on the above eleven polyatomic gases. The paper contains ten tables (mainly intended for the checking of computer codes) and 201 graphs of deviation and comparison plots. An additional 98 tables have been deposited with the Physics Auxiliary Publication Service (PAPS) of the AIP. The algorithms presented in this paper, together with those mentioned above, make it possible to program calculations for a wide range of low‐density equilibrium and transport properties of 16 gases and of all possible multicomponent mixtures formed with them, for a total of 65,535 systems. For each system, the program would cover the full range of compositions.
19(1990); http://dx.doi.org/10.1063/1.555868View Description Hide Description
A new unified equation of state for H2O is presented, which includes the revised and extended scaling equation of Levelt Sengers, Kamgar–Parsi, Balfour and Sengers, is continuous over all single phase states of H2O from triple point pressure and temperature to 1000 MPa (or the melting line) and 1000 °C and provides accurate representation of existing thermodynamic data in that range. In addition it provides a smooth transition from singular critical region functions to the nonsingular far‐field functions. This is demonstrated by the variations of isochoric specific heat, isothermal compressibility, speed of sound,specific heat ratio and coexistence line properties in the critical region.