MODELING OF PARTICLE MOVEMENT AND THERMAL-BEHAVIOR DURING HIGH-VELOCITY OXY-FUEL SPRAYING

A theoretical model is presented to investigate the particle mechanical and thermal behaviour in the process of high velocity oxy-fuel (HVOF) spraying. The model accounts for the various phenomena which influence the momentum and heat transfer during particle movement and heating. The mathematical formulation takes into account the fluid velocity dependence on the particle density, internal heat conduction in particles and their composite structure, steep temperature gradients near the particle surface and fluid parameter variations. Comparison with experimental data shows that the present model enables accurate predictions to be made and optimal conditions of HVOF spraying to be established.