Numerical Simulation of Nickel Nano-powder Preparing Process by DC Arc Thermal Plasma
Study on vaporization process of nickel powder particles inside direct current thermal plasma can provide theoretical guidelines for improving preparation process of nickel nanopowder.In this research,the effects of particle size,working gas flow rate and powder feeding rate on the motion behavior and heating process of nickel particles in DC thermal plasma were investigated by coupled solution of the magnetohydrodynamic equations and particle thermodynamic equations.The results show that smaller particles can be heated to complete vaporization in a shorter time owing to longer residence time in the high temperature region and absorbing more heat from the plasma.Decrease in working gas flow rate and powder feeding rate can increase the energy of nickel particle obtained from plasma,which is beneficial to the increase in the vaporization rate of the partials and the quality improvement of the final prepared nickel nano-powder.
direct current thermal plasmanickel nano-powdervaporization processnumerical simulation