The first purpose of this project are to determine how closely simple, weighted, cross sections can match the collision integrals of the Chapman-Cowling formulation as a function of temperature. The second is to demonstrate that simple formulae for viscosity, thermal conductivity, and mass diffusion of gas mixtures approximate the functional form of more exact models. The third purpose is to find empirical adjustments of the cross sections and/or constant coefficients in the mixture formulae which will not only retain the proper functional form but will also quantitatively reproduce more exact models. The goal is to provide a fast, efficient algorithm which can be used in CFD programs with the most speed possible so that these programs can find solutions to complex, non-equilibrium airflow conditions in reasonable computation times. The methods developed will also provide a basis for quick calculation of transport properties of gas mixtures other than air.
Potential Commercial Applications: The methods developed would apply to all high temperature gas systems such as combustors, turbines, internal combustion engines, etc., whether for commercial or government applications.STATUS: Phase I Only
