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Published in:
2018 | OriginalPaper | Chapter
Elucidation of Mechanism for Reducing Porosity in Electric Arc Spraying Through CFD
Authors : Ryoji Tamaki, Masashi Yamakawa
Published in: Computational Science – ICCS 2018
Publisher: Springer International Publishing
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Abstract
We elucidated the mechanism for reducing the porosity (a means for achieving smaller globules) through Computational Fluid Dynamics while focusing on the flow of compressed air. A simulation study revealed that a spray gun nozzle comprising a flow splitting plate located upstream of the arc point in the nozzle produces compression waves whereby the flow field made in the nozzle differs substantially from that made in a conventional, plate-less nozzle. Observation using a high-speed camera showed that smaller particles of the molten metal (globules) were made due to the plate, which means that the compression waves generated upstream of the arc point affect the formation of globules at the arc point.