Numerical study of influences of buoyancy and solutal Marangoni convection on flow structures in a germanium-silicon floating zone by K. Lin, P. Dold, and K. W. Benz

Crystal Research and Technology

Cryst. Res. Technol. 40, 550 (2005) - Abstract -

Numerical study of influences of buoyancy and solutal Marangoni convection on flow structures in a germanium-silicon floating zone

K. Lin, P. Dold, and K. W. Benz

Kristallographisches Institut der Universität Freiburg, Germany

Keywords	Marangoni flow, Prandtl number, GeSi, floating zone method, FIDAP
PACS	81.10.-h
DOI	10.1002/crat.200410382

This paper presents a numerical study of Marangoni flows in a floating zone of germanium-silicon crystals, which was performed by using a commercial finite element program FIDAD^TM. The numerical results point out that for fluids with a small Pr number the influence of buoyancy forces cannot be ignored in the numerical model. Furthermore, the competition between the thermocapillary (TC) and solutocapillary (SC) flows in the floating zones was qualitatively examined. If the TC flow is as strong as that in the Si-rich floating zone, the SC flow may be restricted to the bottom area near the free surface. Otherwise, the SC flow may overcome the TC flow and induce a surface transfer of species. The numerical predictions agree well with the previous experiment results.

The full text of this paper in pdf-Format:

If you have come directly to this page, click this symbol

to go to the CRT homepage.