Density, heat capacity, viscosity, and thermal conductivity of mixtures of CO2, He, H2, H2O, N2, and O2. Technical report, October 1991-July 1994
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 such calculations the authors 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 the authors 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 the authors have subroutines are thermal conductivity in watts/meter x degree/ K, viscosity micropoise, density in moles/cu cm, heat capacity in Joules/mole x degree /K, and the vapor pressure of water in torr.
- Research Organization:
- Naval Medical Research Inst., Bethesda, MD (United States)
- OSTI ID:
- 121825
- Report Number(s):
- AD-A-288731/3/XAB; NMRI-94-51; TRN: 52890402
- Resource Relation:
- Other Information: PBD: Jul 1994
- Country of Publication:
- United States
- Language:
- English
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