Hybrid model of chemical equilibrium equation of state for nonideal plasmas in underwater wire explosion simulation

We present the equations of state (EOS) of metal plasmas in non-ideal regimes computed by a hybrid approach that combines the chemical equilibrium model with analytic formulae
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of free energy devised to accurately fit ab inito calculations. The correction term of ionization potential in the Saha equation is formularized explicitly with the analytic free energy functions to give iteratively converged solutions to the ionization balances.
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The EOS obtained by this hybrid approach is compared with results from other theoretical models, and then applied to a hydrodynamic simulation of underwater wire explosion.
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The validity and accuracy level for its practical applications are briefly discussed.