DefinePK

Abstract

The calculation of the velocity and temperature of solid particles in the process of cold gas dynamic spraying is considered. The movement of the carrier gas in the de Laval nozzle and in the space between the nozzle exit and the substrate surface is determined by one-dimensional isentropic approach and by CFD method that comprising a solution of Euler and Reynolds Averaged Navier-Stokes (RANS) equations using a commercial package Ansys CFX. Particle velocity and particle temperature are obtained as a functions of particle diameter and input pressure. In the nozzle similar results are obtained by using a one-dimensional isentropic approach and the solution of the Euler equations. Calculated velocity of the particle is slightly greater than the velocity obtained by solutions of the RANS equations. For small particles of 1 micron in diameter, in the space between the nozzle exit and the substrate surface there are the large speed reduction and large particle heating due to of the bow shock near the substrate.