Behavior of the Melt in the Vertical Bridgman Method with a Low Axial Temperature Gradient
| Autor: | E. N. Korobeynikova, V. K. Artemyev, V. S. Sidorov, V. I. Strelov, G. N. Kozhemyakin |
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| Rok vydání: | 2018 |
| Předmět: |
Convection
Materials science Convective heat transfer Crystal growth 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Thermal diffusivity Surfaces Coatings and Films Volumetric flow rate Physics::Fluid Dynamics Temperature gradient 020303 mechanical engineering & transports 0203 mechanical engineering Mass transfer Thermal 0210 nano-technology |
| Zdroj: | Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. 12:261-268 |
| ISSN: | 1819-7094 1027-4510 |
| Popis: | The thermal conditions for the growth of Ge crystals with a diameter of 50 mm by the vertical Bridgman method in the case of low thermal-gravitational convection are studied using model experiments. Distilled water being hydrodynamically similar to the Ge melt is used as the model liquid. When modelling by means of the light cut method, it is established that mixture particles move along the heat flow direction from top to bottom. It is shown that an axial temperature gradient of 2 K/cm or more increases the contribution of thermal diffusion to mass transfer at a vertical flow rate of 0.09 mm/s or more. The numerical simulation of thermal convection in the Oberbeck–Boussinesq approximation confirms the absence of convection under the given thermal conditions. However, the deviation of the container axis from the vertical by 0.5° during the process of crystal growth contributes to the increase in the flow rates in the liquid phase up to 0.55 mm/s. |
| Databáze: | OpenAIRE |
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