Yu.P.Ladikov, P.P.Rabotchiy, O.K.Cheremhukh On convective flow structures in installation of crystallization Bridgmen at high Grassgoff numbers |
Applied hydromechanics, Vol. 8 (80) ¹ 2, (2006) |
| Bridgman method is among the main methods of crystal materials obtaining. Construction features of the Bridgman plant are for convection motion to appear in liquid phase of the substance (in melt) during the crystal growth. Since usually solidification velocity is small (~ 10-6 m/s), even slow convection flows influence on diffusion and heat conditions on the solid-melt interface. Such an influence effects on heat-mass transfer situation and gives rise to the uncontrolled crystal structure distortion. That is why solidification process parameters for convection influence on solid-melt interface to be the least determination problems are relevant. In this paper stationary convection heat-transfer process in melt is under investigation with Boussinesq equations set. Analytically and with numerical modeling it has been shown, that equilibrium melt region for convection motion to be absent can be created near solid-melt interface by appropriate choice of temperature boundary condition, if Grasshoff numbers are large enough. |
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| TEXT LANGUAGE: Russian |