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Heating of Powders in the Fire Ball of an Induction Plasma

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1 Author(s)
Boulos, M.I. ; Chemical Engineering Department University of Sherbrooke Sherbrooke, Quebeck, Canada

A theoretical model has been developed for the calculation of the trajectories and temperature histories of particles injected in the fire-ball of an inductively coupled plasma. Calculations were made for alumina particles of different diameters ranging between 10 and 250 ¿m. The particles were injected through a water cooled probe upstream of the fire-ball. The results shows that the internal plasma recirculation in the coil region is responsable for the bouncing of the particles on the fire-ball. Particles of the order of 10 ¿m and smaler are entrained in the fire-ball by the inward radial flow caused by the electromagnetic pumping, and are subsequently completely evaporated. Larger particles, depending on their initial position and velocity of injection, could by-pass the plasma fire-ball, and in some cases, end up deposited on the wall of the plasma confining tube. Particles with diameters larger than 100 ¿m were found to pass straight through the fire-ball when injected close to the center line of the torch.

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Plasma Science, IEEE Transactions on  (Volume:6 ,  Issue: 2 )