EXP6: A New Equation of State Library for High Pressure Thermochemistry,” paper presented at this Symposium

We discuss the development of EXP6, a new equation of state library for detonation thermochemistry, shock physics, and high pressure gases. Fluid products such as H2O, CO2, and N2, are treated with an exponential-6 equation of state model. Equation of state parameters are found for EXP6 by matching to a combination of shock data and static compression data. Although matching to shock data is traditional in detonation thermochemistry, we show that our model can match a wider range of data including sound speeds and heat capacities at room temperature. Polar detonation products, such as H2O and HF, are treated through a novel "multi-species " representation. This allows the simplicity of the exponential-6 model to be retained while maintaining accuracy for polar fluids