Marangoni convection in the LiCaAIF6 crystal growth by the Czochralski technique

Abstract

Numerical simulation of the mixed convection induced by buoyancy, crystal rotation, and also unbalanced surface tension at the melt-gas interface is conducted by means of the finite volume method in the model of the Czochralski crystal growth. The role of Marangoni convection in the heat and mass transfer is investigated by the comparison of the models with and without surface tension included, and our results indicate that Marangoni convection plays an important role in the heat and mass transfer near the interface of melt and crystal, and also the convection structure.

Three-dimensional unsteady convection in LiCaAlF6-Czochralski growth

“…In the regime of steady 2D axisymmetric convection, a large relative error, up to 24-25%, of the heat flux through melt-crystal interface was reported in the CZ model for 2-in LiCaAlF 6 (LICAF) crystal growth experiment [9]. Because the Marangoni convection is often ignored in literature, the effect of Marangoni convection on the unsteady convection in CZ is investigated in the present paper.…”

Numerical Study on LiCaAlF<SUB>6</SUB> Czochralski Crystal Growth

“…This indicates the importance to include Marangoni convection in the CZ model. 27) Figure 3 shows a rotating rate around 40 rpm is the choice if only criterion (I), a large growth rate, is considered under the assumption of steady 2D convection.…”