D.E. Diller

SECOND AND THIRD VIRIAL COEFFICIENTS FOR HYDROGEN

Second and third virial coefficients for parahydrogen have been derived from closely spaced PVT data from 24 to 100 °K. They are in good agreement at 100 °K with published data for normal hydrogen. Analytical representations of the combined data from about 20 to 423 °K are presented which may be useful in computation of thermodynamic functions of the gas. These formulas are related to those resulting from the use of the Lennard-Jones potential.

The orthobaric densities of parahydrogen, derived heats of vaporization, and critical constants☆

Closely spaced experimental data are presented and used for defining a consistent set of values for critical constants that describe the two-phase boundaries between saturated liquid and saturated vapor. The heat of vaporization is derived. The various considerations affecting the selection of the critical temperatures are discussed. (C.E.S.)

The densities of saturated liquid hydrogen

Densities of para-hydrogen from l7 to 32 K are obtained by extrapolating newly determined compressed liquid isotherms to corresponding vapor pressures. Results are combined with earlier data for the range 14 to 20 f K and compared with normal hydrogen by means of densitytemperature relationships. (auth)

The density and temperature dependence of the viscosity and thermal conductivity of dense simple fluids

Abstract This paper discusses the experimental information on the transport properties of dense simple fluids with emphasis on the compressed and saturated liquid states. Similarities and differences in the wide range density and temperature dependencies of the viscosity and thermal conductivity coefficients are summarized. The excess transport properties of argon, helium, hydrogen, oxygen, and carbon dioxide are graphically compared in the same reduced density and temperature ranges.

The specific heats (Cv) of dense simple fluids

Abstract This paper examines the wide-range temperature and density dependences of the specific heats (Cv) of a number of simple fluids (helium, neon, argon, krypton, parahydrogen, oxygen, and fluorine). The temperature range between the triple point and 2Tc at densities up to 3pc is emphasized. The behaviour of the internal specific heats of the classical monatomic fluids is compared with that of the diatomic and quantum fluids and with internal specific heats derived from molecular dynamics calculations. This comparison shows that (to a first approximation) the internal specific heats of classical monatomic fluids depend only on the intermolecular pair potential energy.

Measurements of viscosities of saturated and compressed fluid chlorotrifluoromethane (R13)

Abstract The shear viscosity coefficients of saturated and compressed fluid chlorotrifluoromethane (R13) have been measured with a torsional crystal viscometer at temperatures between 100 and 320 K, at pressures up to 35 MPa and at densities between 1.5 and 17.7 mol dm −3 . The dependence of the fluidity (viscosity − ) on molar volume and temperature has been examined. At molar volumes between 0.06 and 0.12 dm 3 mol −1 , the dependence on molar volume is linear and there is no significant temperature dependence at fixed volume. The data in this volume range have been correlated with a fluidity-volume equation. Most of the differences between the present data and the equation are smaller than 3%.

Transport properties of fluids of cryogenic interest

Abstract This Paper is a status report for viscosity and thermal conductivity data and correlations for pure fluids and fluid mixtures encountered in cryogenic process technology. Recommended correlations or tables of values are identified for each fluid. Specific data needs for future work are reported. Also presented are brief descriptions of the experimental techniques for viscosity and thermal conductivity measurements along with estimates of the associated experimental uncertainties.

Measurements of the viscosity of compressed liquid air at temperatures between 70 and 130 K

Abstract The shear viscosity coefficient of compressed liquid air has been measured at temperatures between 70 and 130 K and at pressures up to 30 MPa with a torsional crystal viscometer. The fluidity (viscosity −1 ) increases linearly with molar volume at fixed temperature and increases weakly with temperature at fixed volume. The data have been correlated with an empirical fluidity — volume equation. The data are in good agreement with an extended corresponding states model, except at the highest densities.

Survey of current nbs work on properties of parahydrogen.

Subsequent to publication of the invaluable compilation of hydrogen properties by Woolley, Scott, and Brickwedde in 1948 [1], a greater-than-ever need developed for thermodynamic properties of parahydrogen at low temperatures and high pressures, where no data, existed. Many of the needed data have now been supplied by work at the CEL National Bureau of Standards. This report is designed to present a concise description of the various properties and to provide a bibliography of the original publications.

The Clausius-Mossotti functions (molar polarizabilities) of pure compressed gaseous and liquid methane, ethane, propane, butanes, and nitrogen

Abstract This report gives accurate interpolation functions for the Clausius-Mossotti functions (molar polarizabilities) of pure compressed gaseous and liquid methane, ethane, propane, butanes and nitrogen; and suggests a method for calculating the dielectric constants or the densities of their mixtures. The accuracy of calculated Clausius-Mossotti functions for mixtures containing a high concentration of methane is expected to be better than 1% using only data for the pure components. Additional data for the dependence of the excess Clausius-Mossotti fuction on composition could reduce the uncertainty in Clausius-Mossotti functions for multicomponent mixtures to less than 0.2%.