Abstract Plasma spheroidization is used to transform irregularly shaped metal and ceramic powders into spherical forms and to recycle and spheroidize the used powders. The inductively coupled radiofrequency (RF) plasma system is used for spheroidization of irregularly shaped particles. In this study, a computational fluid dynamics (CFD) model is developed for a radiofrequency plasma system designed for powder spheroidization. The electric field is generated analytically by solving the RF coil system, and the resulting equations are then implemented as user-defined functions (UDFs) within the CFD model. UDF codes were created and defined in the Fluent program to generate RF plasma. Electromagnetic fields and fluid flow have been modeled numerically, yielding temperature and velocity distributions. The effect of this plasma environment on the temperature of titanium particles is investigated using various particle-feeding gas flow rates. As a result, an optimal powder feeding rate can be determined. It was observed that high particle velocities prevent the attainment of the required melting temperature, whereas low velocities may cause the temperature to exceed the boiling point. These results indicate that the feeding gas flow rate can be determined for a specific powder size range to achieve powder temperatures within the powder’s melting and boiling ranges.
Ünal et al. (Wed,) studied this question.
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