Abstract
An extensive review is conducted and a comprehensive database is compiled for the transport and thermodynamic properties of helium and nitrogen and their binary mixtures at pressures up to 40 MPa and temperatures from 200 to 1500 K. These gases are attractive working fluids in a closed Brayton cycle for energy conversion in space reactor power systems and terrestrial power plants. Semi-empirical correlations are developed for calculating the properties of the He-N 2 binary mixtures based on the Chapman-Enskog kinetic theory for dilute gases and the application of the law of corresponding states. The correlations accurately account for the effects of pressure and temperature and are in excellent agreement with the compiled properties database.
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