OPTIMIZATION OF THE HEAT AND MASS TRANSFER PROCESSES IN A MECHANISM OF POLYCRYSTALLINE SILICON PRODUCTION BY THE BRIDGEMAN’S TECHNIQUE

The distribution of incoherent impurities in the melt for the polycrystalline silicone production by the Bridgeman’s technique was studied with the aid of 3D numerical simulation. Under study was the influence of the phase transition configuration on the distribution of the displaced substance near the crystallization front under the conditions of azimuthnonuniform heating of crucible side walls. The flow in the liquid is described by Navier-Stokes equations in the Boussinesq approximation, the distribution of the dissolved substance concentration is found from the solution of the convective diffusion equation. The obtained results show that the nonuniform heating of the melt changes the structure of convective flows; in the case of flat or convex crystallization front, these flows promote the displacement of the dissolved admixture toward the crucible walls. The processes were considered within the range of parameters following the real temperatures in a growth furnace and the melt, crucible size and shape.

Keywords:
convection, polycrystalline silicon, heat and mass transfer, simulation.
УДК 517.958:532.5+519.6

OPTIMIZATION OF THE HEAT AND MASS TRANSFER PROCESSES IN A MECHANISM OF POLYCRYSTALLINE SILICON PRODUCTION BY THE BRIDGEMAN’S TECHNIQUE