1. A modified phase-field three-dimensional model for droplet impact with solidification
- Author
-
Ben Q. Li, Bin Zhao, Yu Bai, Qingzhen Yang, Shaochong Zhu, Mingguang Shen, Yu Wang, Yongbao Hu, and Tianqing Li
- Subjects
Fluid Flow and Transfer Processes ,Thermal contact conductance ,Work (thermodynamics) ,Materials science ,Field (physics) ,Mechanical Engineering ,General Physics and Astronomy ,Mechanics ,Physics::Fluid Dynamics ,Latent heat ,Heat transfer ,Fluid dynamics ,Supersonic speed ,Thermal spraying - Abstract
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.
- Published
- 2019