Showing papers by "Joseph Kestin published in 1984"

Equilibrium and transport properties of the noble gases and their mixtures at low density

Abstract: The report contains a set of easy‐to‐program expressions for the calculation of the thermodynamic and transport properties of the five noble gases (He, Ne, Ar, Kr, Xe) and of the 26 binary and multicomponent mixtures that can be formed with them. The properties in question are second virial coefficient B, viscosity η, thermal conductivity λ, self‐diffusion and binary diffusion coefficient D, and thermal diffusion factor αT. The calculation of properties is restricted to low densities ( ρ≪B/C) but covers the full range of compositions and a temperature interval extending from absolute zero to the onset of ionization. Owing to the careful theoretical basis on which the algorithm has been erected, all properties are thermodynamically consistent with each other. Reference to a selected set of critically evaluated measurements provides a basis for the estimation of uncertainties. The report contains 54 abbreviated tables of numerical data and 86 deviation plots. It is asserted that the results are comparable to the best measurements that could be performed at present.

Thermophysical properties of fluid D2O

Abstract: The present publication contains data on the thermophysical properties of deuterium oxide (heavy water). It is a companion to the paper on the thermophysical properties of fluid H2O published earlier in this journal by the same authors. The properties are represented by equations which can be readily programed on a computer and incorporated in data banks. All data have been carefully and critically analyzed. The compendium represents the best available data for fluid D2O.

Viscosity of aqueous NaCl solutions in the temperature range 25–200 °C and in the pressure range 0.1–30 MPa

Abstract: New precise viscosity data are presented for aqueous solutions of NaCl; these data cover the temperature range 25–200 °C, the pressure range 0.1–30 MPa, and the concentration range 0–6 mol · kg−1. The experimental precision is ±0.5%; a comparison of the present results with data available in the literature indicates that the accuracy of the present data is also of the order of ±0.5%. Two empirical correlations that reproduce the data within the precision are also given.

Thermal conductivity of two binary mixtures of gases of equal molecular weight

Abstract: The paper reports new measurements of the thermal conductivity of two binary mixtures at a nominal temperature of 27.5°C but over a pressure range. The two systems, N 2 -CO (three compositions up to 12MPa) and N 2 O-CO 2 (four mixtures up to 4.2 MPa) have been chosen because they consist of molecules of similar structure and equal molecular weight (28.01 and 44.01, respectively). Moreover, the zero-density viscosity is identical within each mixture. The results have been extrapolated and fitted to equations in the usual way. The zero-density thermal conductivity in each system varies systematically with composition and differs by about 4% for the pure components in each case. This is a measure of the effect of the internal degrees of freedom on thermal conductivity. In the absence of a reliable theory, it is shown that the equations of kinetic theory can be used to represent the composition-dependence of zero-density thermal conductivity with a judicious choice of two quantities which cannot be calculated independently. In both systems, both the excess thermal conductivity λ ( T , ϱ ) - λ ( T , 0) and the ratio λ ( T , ϱ )⧸ λ ( T , 0) are sole functions of density with a remarkable degree of precision. The variation of the thermal conductivity with density could be predicted quit accurately with the aid of the theory due to Mason.

Thermal conductivity of three noble gases with carbon monoxide

Abstract: The paper reports the results of new measurements of the thermal conductivity of binary mixtures of helium, neon and argon with carbon monoxide at 27.5°C and in the pressure range 0.7–12 MPa. The viscosity of these mixtures had been measured previously. The availability of their interaction viscosity allows us to calculate the contribution of the internal degrees of freedom. The Monchick-Pereira-Mason equation provides a reasonable, but far from perfect, basis for a correlation. Even though the low-density viscosity of the present mixtures was essentially the same as the corresponding mixtures with nitrogen, the thermal conductivity is different, pointing to a significant contribution from the rotational degrees of freedom. A comparison between a calculation of the density effect based on a modification of the Thorne-Enskog theory due to Mason et al. shows the same reasonable agreement (of order 2%) as that ascertained in earlier measurements on other mixtures.

Thermal conductivity of methane with carbon monoxide

Abstract: The paper reports the results of new measurements of the thermal conductivity of CH 4 -CO mixtures at 27.5°C and up to a pressure of 12 MPa. This further contribution to a growing body of data on the thermal conductivity of binary mixtures of polyatomic gases is analyzed in the same way as was done by the present group in several earlier publications with essentially identical conclusions.