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Vapor-liquid equilibria data for the helium-nitrogen system as predicted by the Van Der Waals Equation of State.
Dalton BJ; Barieau RE
NTIS: PB 199 076, 1971; :1-184
The Bureau of Mines Helium Research Center has developed a computer program for solving two-phase equilibria data for binary mixtures and for evaluating thermodynamic functions of interest, including all critical points. This computer program was used to calculate equilibrium points on the pvtu surface for the helium-nitrogen system as predicted by the van der waals equation of state. Numerical values are tabulated and illustrations are presented for 1,279 equilibrium points and for quantities needed to construct ponchon diagrams. Equilibrium ratios as a function of pressure at constant temperature and of temperature at constant pressure are also shown graphically. In addition, saturated partial molal volume and partial molal enthalpy data are given. It is shown that the van der waals helium-nitrogen system exhibits retrograde condensation of the second type for liquid helium concentrations of about 0.07 Mole fraction or less and pressures below about 45 atm. It is also shown that the critical point is at a maximum value of pressure (at constant temperature) and of temperature (at constant pressure). (Out of print.)
Helium; Nitrogen compounds; Computer programs; Thermodynamics
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 199 076
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division