Home / Articles / Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode

Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode

Vladimir S. Berdnikov 1
Vladimir S. Berdnikov
1 Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Lavrentieva Ave., Novosibirsk 630090, Russia
Published 12 September 2019
Communication , Volume 5, Issue 3, 91-100
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Berdnikov V. S. Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode // Modern Electronic Materials. 2019. Vol. 5. No. 3. pp. 91-100.
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Berdnikov V. S. Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode // Modern Electronic Materials. 2019. Vol. 5. No. 3. pp. 91-100.
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TY - JOUR
DO - 10.3897/j.moem.5.46647
UR - https://moem.colab.ws/publications/10.3897/j.moem.5.46647
TI - Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode
T2 - Modern Electronic Materials
AU - Berdnikov, Vladimir S.
PY - 2019
DA - 2019/09/12
PB - НИТУ МИСИС
SP - 91-100
IS - 3
VL - 5
ER -
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@article{2019_Berdnikov,
author = {Vladimir S. Berdnikov},
title = {Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode},
journal = {Modern Electronic Materials},
year = {2019},
volume = {5},
publisher = {НИТУ МИСИС},
month = {Sep},
url = {https://moem.colab.ws/publications/10.3897/j.moem.5.46647},
number = {3},
pages = {91--100},
doi = {10.3897/j.moem.5.46647}
}
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MLA
Berdnikov, Vladimir S.. “Hydrodynamics and heat exchange of crystal pulling from melts. Part I: Experimental studies of free convection mode.” Modern Electronic Materials, vol. 5, no. 3, Sep. 2019, pp. 91-100. https://moem.colab.ws/publications/10.3897/j.moem.5.46647.
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Keywords

boundary layers
crystal growth
crystallization front shape
Czochralski technique
heat exchange
laminar-turbulent transition
local heat flows
thermal gravity capillary convection

Abstract

This work is a brief overview of experimental study results for hydrodynamics and convective heat exchange in thermal gravity capillary convection modes for the classic Czochralski technique setup obtained at the Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences. The experiments have been carried out at test benches which simulated the physics of the Czochralski technique for 80 and 295 mm diameter crucibles. Melt simulating fluids with Prandtl numbers Pr = 0.05, 16, 45.6 and 2700 have been used. Experiments with transparent fluids have been used for comparing the evolution of flow structure from laminar mode to well-developed turbulent mode. Advanced visualization and measurement methods have been used. The regularities of local and integral convective heat exchange in the crucible/melt/crystal system have been studied. The experiments have shown that there are threshold Grashof and Marangoni numbers at which the structure of the thermal gravity capillary flow undergoes qualitative changes and hence the regularities of heat exchange in the melt change. The effect of melt hydrodynamics on the crystallization front shape has been studied for Pr = 45.6. Crystallization front shapes have been determined for the 1 × 105 to 1.9 × 105 range of Grashof numbers. We show that the crystallization front shape depends largely on the spatial flow pattern and the temperature distribution in the melt.

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