F. Ben Ettouil, O. Mazhorova, SPCTS UMR 66 38 CNRS University of Limoges, Limoges, France; B. PATEYRON, H. AGEORGES, SPCTS - UMR CNRS 6638, Faculty of Sciences, Limoges cedex, France; M. El Ganaoui, P. Fauchais, University of Limoges, Limoges, France
When spraying ceramic particles with a poor thermal conductivity such zirconia in Ar-H2 d.c plasma jets, where the heat transfer is important, heat propagation phenomena take place with the propagation of front of melting, evaporation or even solidification.
Most model neglect this heat propagation phenomena assuming the particle as a lumped medium. This work is aimed at developing a model coupling the effect of heat propagation with the particle dynamic within the jet.
It uses an adaptative grid scheme in which the phase change fronts are fixed. It allows minimizing the costs calculations (approximately 10 sec on PC under windows XP which with an enthalpic model are in the oeder of 1 hour). Such calculations are illustrated for zirconia and iron particles which evaporation in an Ar-H2 (25 %) is important.
When spraying ceramic particles with a poor thermal conductivity such zirconia in Ar-H2 d.c plasma jets, where the heat transfer is important, heat propagation phenomena take place with the propagation of front of melting, evaporation or even solidification.
Most model neglect this heat propagation phenomena assuming the particle as a lumped medium. This work is aimed at developing a model coupling the effect of heat propagation with the particle dynamic within the jet.
It uses an adaptative grid scheme in which the phase change fronts are fixed. It allows minimizing the costs calculations (approximately 10 sec on PC under windows XP which with an enthalpic model are in the oeder of 1 hour). Such calculations are illustrated for zirconia and iron particles which evaporation in an Ar-H2 (25 %) is important.
