1. A modified phase-field three-dimensional model for droplet impact with solidification.
- Author
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Shen, Mingguang, Li, Ben Q., Yang, Qingzhen, Bai, Yu, Wang, Yu, Zhu, Shaochong, Zhao, Bin, Li, Tianqing, and Hu, Yongbao
- Subjects
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METAL spraying , *THREE-dimensional modeling , *NAVIER-Stokes equations , *SOLIDIFICATION , *DROPLETS , *THERMAL resistance - Abstract
• The solution of the Cahn-Hilliard equation to track moving boundaries. • A heat source term added in energy equation to trace solidification profile. • Thermal contact resistance studied to find its effect on maximum spread factor. • A supersonic impact of ceramic particles examined. A modified phase-field three-dimensional model has been developed to simulate the spreading of an impacting droplet undergoing solidification. The model is based on the numerical solution of the Cahn-Hilliard equation coupled with the Navier-Stokes equations for fluid flow and the energy balance equation for heat transfer. The solidification profile is tracked by treating the latent heat as a source term in the energy equation, which is modified to work with the Cahn-Hilliard equation. To verify the model, five cases were tested and matched well with experiments. Also, the effect of thermal contact resistance on the maximum spread factor of a solidifying droplet is discussed. One case was taken from practical thermal spraying conditions where a solidifying ceramic droplet spreads on a cold surface at a supersonic impact velocity; computed results are consistent with available measurements. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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