Abstract

In the cold spray process, the nozzle geometry influences the thermodynamics of the propellant gas and thus the particle behavior. It is therefore one of the decisive factors influencing the cold spray process. In this paper, the influence of the nozzle geometry on the cold spray process with regard to its nozzle shape and size is investigated with the help of simulation and also experimentally. The simulation shows that the particle velocities at the nozzle outlet with the "de Leval nozzle" are higher than those with the "convergence-divergence-pipe-nozzle" and those with the "convergence-pipe-nozzle." However, the particle temperatures are higher with the "conversion pipe nozzle" than with other nozzles. Paper includes a German-language abstract.

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