Numerical simulation of gas-particle two phase flow in Aluminum-oxide ceramics powder spraying process

The quality of spraying is influenced by the gas velocity and particle velocity in the cold spraying process. A physical model for supersonic gas-particle two phase flow in cold spraying process is established. Numerical simulation for inlet and outlet flow field of Laval nozzle is carried out. The effects of throat diameter, spraying pressure, temperature and particle size on the gas velocity and particle velocity are investigated. The simulation results show that the gas velocity and particle velocity increase with the increment of spraying pressure and temperature, and the smaller throat diameter, the better gas acceleration in the nozzle, while the particle velocity increases when particle diameter decreases.