https://doi.org/10.1051/epjap/2019190279
Regular Article
Numerical study of the melting and resolidification of the substrate during the impact of a ceramic droplet in a plasma spraying process★
1
Université Blida1, Algérie, Institut d’Aéronautique et des Etudes Spatiales, Laboratoire des sciences aéronautiques,
BP. 270 route de Soumaa,
Blida, Algérie
2
Lorraine University, Energetic Laboratory of Longwy (FJV/LERMAB), Henri Poincare Institute of Longwy,
186 rue de Lorraine,
54400 Cosnes-et-Romain, France
* e-mail: drioucheaero@yahoo.fr
Received:
12
September
2019
Received in final form:
23
September
2019
Accepted:
26
November
2019
Published online: 17 January 2020
The substrate melting can significantly improve the properties of plasma spray coatings. Indeed the adhesion of the projected particles to the substrate can be ameliorated by the substrate melting. In this article, a numerical model is developed to study the dynamics of fluids and heat transfer with liquid/solid phase change during impact of a fully melted alumina particle on an aluminum solid substrate, taking into account of the substrate melting. The model is based on solving the Navier-Stokes and energy equations with liquid / solid phase change. These equations are coupled with the fluid of volume method (VOF), to follow the free surface of the particle during its spreading and solidification. The finite volume method is used to discretize the equations in a 2D axisymmetric domain. A comparison with the published experimental results was carried out to validate this numerical model. Simulations were performed for different initial droplet diameters to study its effect on droplet spreading as well as on substrate melting. It has been observed that the substrate melting begins before the droplet spreads completely; the substrate melting reaches its maximum when the droplet is close to its total solidification. Droplet spreading and substrate melting are more important for large sizes droplets.
© EDP Sciences, 2020
