“…The third phase of comparisons corresponds to a potassium-seeded gas mixture representative of oxy-fuel combustion of methane (O 2 -CH 4 ), with a relatively high absolute temperature of 3040 K. The details about this case and the independent results were reported in a study led by the National Energy Technology Laboratory (NETL) of the U.S. Department of Energy [159][160][161][162], which was concerned with modeling the electric conductivity of plasma and modeling the electron-ion collision cross-sections. Nine species with very insignificant fractions were omitted (HO 2 , H 2 O 2 , K + , KH, KO, KOH, O − , and OH − , and electrons) in the simulation here, where the individual mole fractions of these neutral or ionic species are approximately below 10 − 3 .…”