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1172 |
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Particle trajectories by arc spraying with cored wires |
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Wolfgang Tillmann / Institute of Materials Engineering, Germany Evelina Vogli* / Institute of Materials Engineering, Germany Mohamed Abdulgader/ Institute of Materials Engineering, Germany Marcel Gurris/ Institute of Applied Mathematics, Germany Dmitri Kuzmin/ Institute of Applied Mathematics, Germany Stefan Turek/ Institute of Applied Mathematics, Germany |
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To use the manifold possibilities that arc spraying offers to deposit wear resistance layers, the knowledge of the particle formation and their characteristics are necessary. The work is focused on studying the particle trajectories during arc spraying with cored wires. Different cored wires under various spraying parameters are investigated by means of a high velocity camera. Particles properties in-flight, such as velocity and temperature are determined. Correlation between particle trajectories and particle characteristics at different spraying conditions are established. At the same time, the particle-laden gas flow is simulated numerically and the computed solutions are used to illustrate the utility of the proposed CFD model and compared with experimental results. The employed mathematical model represents a system of macroscopic conservation laws for the continuous gas phase and for the gas-solid mixture. This formulation makes it possible to circumvent the numerical difficulties associated with the implementation of a (potentially ill-posed) two-fluid model. The discretization in space is performed using a high-resolution finite element scheme based on algebraic flux correction in terms of local characteristic variables. The artificial diffusion operator is constructed on the discrete level and fitted to the local solution behavior using a multidimensional flux limiter of TVD type. |