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Civil-Comp Conferences
ISSN 2753-3239
CCC: 2
PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY
Edited by: B.H.V. Topping and P. Iványi
Paper 2.6

Modeling YSZ droplet impact with solidification microstructure formation under a horizontal electric field in plasma spraying

M.G. Shen1 and B.Q. Li2

1School of Mathematics and Statistics, Yancheng Teachers University, Yancheng, PR China
2Department of Mechanical Engineering, University of Michigan, Dearborn, USA

Full Bibliographic Reference for this paper
M.G. Shen, B.Q. Li, "Modeling YSZ droplet impact with solidification microstructure formation under a horizontal electric field in plasma spraying", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Eleventh International Conference on Engineering Computational Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 2, Paper 2.6, 2022, doi:10.4203/ccc.2.2.6
Keywords: phase field method, polycrystal growth, Cahn-Hilliard equation, multiphase flow.

Abstract
Current numerical models simplify the solidification microstructure formation process in plasma spraying conditions, and deal little with droplet shape control while undergoing solidification microstructure formation via external forces. The paper may shed light on how to control splat shape and crystal growth in plasma spraying by developing a novel model. Centered on the Cahn-Hilliard equation, the current numerical model employs the coupled Navier-Stokes equations to track the liquid-gas interface, and by virtue of an embedded phase field model combined with the heat balance equation, captures grain-grain boundary and solid-liquid interface. The electric force is added as a source term in the Navier-Stokes equations and the fluids are assumed perfect dielectrics. Explicit finite difference solutions are sought with the aid of parallel computing. The major findings are that the electric force exerts little effect on microstructure formation but changes dramatically drop shape and hence solidification time. Besides, the recoiling could be prevented completely, resulting in a pancake like splat of reduced thickness.

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