Simulation of Critical Velocity of Cold Spray Process with Different Turbulence Models

Cold spray is a distinctive coating technology that allows for solid state bonding of particles under atmospheric pressure when the velocity of the solid particles exceeds a critical velocity and below erosion velocity. In literature it has been demonstrated at lower critical velocity, better coating quality and energy efficient coating is achieved. The critical velocity is affected by many process parameters. Therefore it can be essential parameter for approval of coating quality. In the present study, to improve the performance of cold spray system, the computational fluid dynamics (CFD) analysis of cold spray process including the de Laval nozzle was done with the different type of turbulence models such the standard k-epsilon model, Realizable k-epsilon model and Reynolds stress model. The simulation numerical models results were compared with the experimental results available in the literature. It is observed that Realizable k-epsilon model may be taken care-off the most realistic consideration although a two-equation model. (C) 2018 Elsevier Ltd. All rights reserved.