In the modelling of non-transferred plasma torches, the electrical potential is normally used in the same way as in the simulation of transferred plasma torches. This approach results in physically questionable current density profiles. A modification is proposed in the manner that the electrical potential is used in the simulation of non-transferred plasma torches. The new model provides in physically acceptable results. A comparison of the results obtained from the two models (the previously used and the presently proposed), shows differences of up to 50% in the velocity and 20% in the temperature were found. Tests were performed with the new model showing the possibility of using it for a broad range of parameters. [References: 15]
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