Oscillatory double diffusive convection in crystal growth

• Published in: Journal of crystal growth 1994-02, Vol.135 (3), p.587-593
• Main Authors: Zhou, H., Zebib, A.
• Format: Article
• Language: English
• Subjects: Convection and heat transfer; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Growth from vapor; Materials science; Methods of crystal growth; physics of crystal growth; Physics; Turbulent flows, convection, and heat transfer
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/0022-0248(94)90151-1

A detailed numerical study of oscillatory convection in a horizontal container which models crystal growth by the physical vapor transport technique has been carried out. The enclosure is subjected to simultaneous horizontal temperature and concentration gradients. The primary goals of this investigation are to predict the critical parameters associated with this phenomena and their influence on the heat and mass transport processes. Our results indicate that the onset of oscillatory motion occurs at a Grashof number (Gr) of about 10 4 in opposing double diffusive convection. Thus oscillatory convection takes place at a significantly reduced critical Gr compared with the case of pure thermal convection. We also found that boundary fluxes at the interfaces promote the onset of oscillation and increase the heat and mass transfer. The effects of different species and enclosure sizes on the critical states are presented.