Size-dependent distributions of particle velocity and temperature at impact in the cold-gas dynamic-spray process

A mathematical model, which describes the particle velocity and temperature of impact in the cold-gas dynamic-spray process and accounts for varying drag and heat transfer coefficients, is developed and validated. Using the proposed model, the distributions of impact velocity and temperature as function of particle diameter are predicted and their dependence on process parameters, standoff distance and the particular trajectory of the particle in the jet is analyzed. These distributions must be taken into account if a correct description of the required impact conditions for successful deposition in cold-gas spraying is to be understood and modelled. (C) 2014 Elsevier B.V. All rights reserved.