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Density, Heat Capacity, Viscosity, and Thermal Conductivity of Mixtures of CO2, He, H2, H2O, N2, and O2.
Technical rept. Oct 91-Jul 94,
NAVAL MEDICAL RESEARCH INST BETHESDA MD
Pagination or Media Count:
The thermodynamic properties of gas mixtures are not always well approximated by the average properties of pure gases weighted by the fractional composition. In order to improve our calculations we have turned to the literature to find formulas said to be useful for calculating the properties of mixtures in the range of temperatures and pressures encountered in human diving. Very little has been published on experimental determinations of properties of mixtures, so we have sought principally to verify that the formulas for mixtures give a good match to data on pure gases. In order to match data on pure gases, the values for the critical temperature TC and the critical pressure PC for H2 and He were modified. In addition, ad-hoc adjustments have been made to the critical volumes VC to make viscosity at low pressures match tables for these two gases. Omega, the acentric factor in the formulas, is taken as zero for all gases. The properties for which we have subroutines are thermal conductivity in wattsmeter x degree K, viscosity micropoise, density in molescu cm, heat capacity in Joulesmole x degree K, and the vapor pressure of water in torr.
APPROVED FOR PUBLIC RELEASE