Mixing of a cold jet with a transverse plasma flow

Summary form only given. A three-dimensional, laminar model has been used for the prediction of the mixing pattern of a cold jet issuing normal to a plasma cross flow. The isothermal injection of nitrogen into atmospheric argon was studied, and the calculated concentration of nitrogen was compared with measured values. Excellent agreement between measurements and the predictions one diameter downstream of the jet was found. The case of laminar mixing of a nitrogen jet with an argon plasma flow in an RF plasma reactor is also considered. The cold nitrogen gas enters the reactor either through a side jet or through a central probe. A comparison between the nitrogen concentration fields for the two methods of injection was performed. Better mixing was found to occur in the case of side injection. This is mainly because, for the side injection, the mixing is controlled by convective forces, whereas for the central probe case it is controlled by diffusion