Solute segregation in a lid driven cavity: Effect of the flow on the boundary layer thickness and solute segregation

• Published in: Journal of crystal growth 2012-02, Vol.340 (1), p.149-155
• Main Authors: Garandet, J.P., Kaupp, N., Pelletier, D., Delannoy, Y.
• Format: Article
• Language: English
• Subjects: A1. Convection; A1. Directional solidification; A1. Segregation; A2. Growth from melt; B2. Germanium silicon alloys; Chemical Sciences; Material chemistry
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2011.11.071

Our objective in the present work is to study the effect of convective flows, ranging from laminar to fully turbulent, on solute segregation in directional solidification configurations. To do so, numerical simulations performed in a model 2D lid driven cavity; the problem parameters, apart from the species molecular diffusion coefficient, are the lid and growth velocities. Purely diffusive to fully convective mass transport conditions are modelled in our parametric study. In parallel, a scaling analysis aiming at the determination of the solute boundary layer thickness is proposed. The results show that a single non-dimensional number, based on the interface stress, is able to capture the physics of the solute transport phenomena. ► Numerical simulations of convection and mass transport phenomena are carried out. ► Simulation parameters are diffusion coefficient, growth and imposed velocities. ► A scaling analysis allows to recover the results of numerical simulations. ► A parameter allowing to capture the physics of the transport phenomena is identified.