Journal
JOURNAL OF CRYSTAL GROWTH
Volume 461, Issue -, Pages 30-37Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcrysgro.2016.12.097
Keywords
Directional solidification; Fluid flows; Magnetic fields; Computer simulation; Stirring
Funding
- Federal Ministry for Economic Affairs and Energy (BMWi) [0325646G, 0325805K]
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This paper describes novel equipment for model experiments designed for detailed studies on electromagnetically driven flows as well as solidification and melting processes with low-melting metals in a square -based container. Such model experiments are relevant for a validation of numerical flow simulation, in particular in the field of directional solidification of multi-crystalline photovoltaic silicon ingots. The equipment includes two square-shaped electromagnetic coils and a melt container with a base of 220x220 mm(2) and thermostat controlled heat exchangers at top and bottom. A system for dual-plane, spatial- and time-resolved flow measurements as well as for in-situ tracking of the solid-liquid interface is developed on the basis of the ultrasound Doppler velocimetry. The parameters of the model experiment are chosen to meet the scaling laws for a transfer of experimental results to real silicon growth processes. The eutectic GaInSn alloy and elemental gallium with melting points of 10.5 degrees C and 29.8 degrees C, respectively, are used as model substances. Results of experiments for testing the equipment are presented and discussed.
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