Numerical study of semi-molten droplet impingement |
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Authors: | H Tabbara and S Gu |
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Institution: | (1) State Key Lab of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001, China |
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Abstract: | Due to the low thermal conductivity of ceramics large temperature gradients are present through the powder particles during
plasma spray deposition. As a result the particles often impinge at the substrate in a semi-molten form; which in turn substantially
affects the final characteristics of the coating being formed. This study is dedicated to the novel modelling development
and simulation of a semi-molten droplet impingement. The study examines the impingement process during impact, spreading and
solidification of semi-molten zirconia. The simulation provides an insight to the heat transfer process during impact and
solidification of a semi-molten powder particle and illustrates the freezing-induced break-up mechanism at the splat periphery. |
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