This study compares the predictions of a multicomponent reactive model of inductive plasma reactor mixing and experimental data obtained with the enthalpy probe technique. Central injection of two different gases, helium and nitrogen, into the core of an inductive (h.f.) plasma discharge permits us to analyze the influence of the nature of the central gas on the reactor＇s mixing patterns. This work highlights diffusion in a multicomponent situation. The model considers the dissociation of H-2, present in the sheath gas.