Multicomponent-Multiphase Equation of State for Carbon

The PANDA code is used to build a tabular equation of state (EOS) table for carbon. The model includes three solid phases (graphite, diamond, and metallic) and a fluid phase mixture containing three molecular components (C1, C2, and C3). Separate EOS tables were first constructed for each solid phase and for each molecular species in the fluid phase. Next, a mixture/chemical equilibrium model was used to construct a single multicomponent EOS table for the fluid phase from those for the individual chemical species. Finally, the phase diagram and multiphase EOS were determined from the Helmholtz free energies. The model gives good agreement with experimental thermophysical data, static compression data, known phase boundaries, and shock-wave measurements. This EOS covers a wide range of densities (0 100 g/cm3) and temperatures (0 1.0×108K). The new EOS table can be accessed through the SNL-SESAME library as material number 7830. Multicomponent-Multiphase Equation of State for Carbon Gerald I. Kerley, Consultant Kerley Technical Services P.O. Box 709 Appomattox, VA 24522-0709 Lalit C. Chhabildas Shock Physics Applications Department Sandia National Laboratories, P.O. Box 5800 Albuquerque, NM 87185-1181