Abstract
Computer simulation of metal powder gas atomisation aims to better understand the complex phenomena involved in the interaction between gas and liquid metal, in order to maximize productivity and to avoid common issues. An efficient axisymmetric simulation of primary and secondary atomisation is proposed, which reduces calculation time in conventional desktop computer to the range of few hours. Primary atomisation is modeled using a Eulerian model that predicts the gas|liquid ratio in the neighborhood of the melt delivery tube. The secondary atomisation uses a Lagrangian particle tracking approach with a multimodal breakup model to predict particle breakup, and thus particle size distribution. Transition from the primary to the secondary atomisation takes place at the iso-surface of void fraction equal to 90%, which is adopted as injection surface. Particle size distributions of gas-atomised copper powder obtained with simulations are compared with experimental results.
Published Version
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