DocumentCode :
1632403
Title :
Time Dependent 3D Large Eddy Simulation of a DC Non-Transferred Arc Plasma Spraying Torch with Particle Injection
Author :
Ghedini, E. ; Colombo, V.
Author_Institution :
Univ. di Bologna, Bologna
fYear :
2007
Firstpage :
899
Lastpage :
899
Abstract :
Summary form only given. The aim of this work is to investigate by means of a 3D time-dependent numerical model the plasma flow and heat transfer inside a DC non-transferred arc plasma torch operating at atmospheric pressure, using a customized version of the CFD commercial code FLUENTcopy. Unsteady flow and heat transfer equations are solved with coupled electromagnetic ones, for an Ar optically thin plasma under conditions of LTE. Cathode and anode regions are taken into account in a simplified way, neglecting the non equilibrium effects of the sheath region. The attachment and detachment of the discharge on the anode wall as a result of the drag of the flow field is predicted, without any external enforcement on the placement of the new attach but imposing an uniform zero potential condition on the wall. Turbulence effects are taken into account by means of a large eddy simulation (L.E.S.) approach, solving the dynamic behavior of the larger scale eddies outside the torch nozzle . Prediction of particle trajectories and thermal history is performed in the time dependent framework, in order to predict the effect of the cold gas entrained eddies on particle behavior. Simulations are performed over a network cluster of double processor calculators due to the large computational requirements of the unsteady model and the grid refinement needed for the turbulence model in a full 3D environment.
Keywords :
arcs (electric); plasma arc spraying; plasma flow; plasma simulation; plasma torches; plasma transport processes; plasma turbulence; 3D time-dependent numerical model; CFD commercial code; DC nontransferred arc plasma spraying torch; FLUENT; cold gas entrained eddies; heat transfer equations; particle injection; plasma flow; time dependent 3D large eddy simulation; turbulence model; unsteady flow; Anodes; Atmospheric modeling; Atmospheric-pressure plasmas; Computational fluid dynamics; Electromagnetic coupling; Heat transfer; Numerical models; Plasma applications; Plasma simulation; Thermal spraying;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 2007. ICOPS 2007. IEEE 34th International Conference on
Conference_Location :
Albuquerque, NM
ISSN :
0730-9244
Print_ISBN :
978-1-4244-0915-0
Type :
conf
DOI :
10.1109/PPPS.2007.4346205
Filename :
4346205
Link To Document :
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