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Summary form only given, as follows. In this work we simulate in 2D argon and oxygen plasma torches using the approximation of thermal equilibrium. Computational model includes Maxwell equation for power deposition Navier-Stokes and Gas flow energy equations with variable thermodynamic and electric properties. Gas density is calculated out of ideal gas law. We compared results obtained with and without body forces accounting for various orientations of plasma torches (up and down). We found that temperature distribution can be significantly altered and influenced by the flow inlet location, mass flow rate and torch orientation with respect to gravity force. We also found that at certain flow conditions radial temperature peak can move close to the skin layer. Computational model was compared and validated against existing experimental data.