Abstract
Flow visualization and temperature fluctuation measurements were carried out for Czochralski bulk flow with silicone oil. A time period of temperature fluctuation beneath a rotating cold cylinder (a model for a crystal rod) was measured and plotted versus Gr/Re 2. The flow modes and the time period of fluctuation were found to correspond to each other. When Gr/Re 2 was greater than the critical value, buoyant flow as dominant and a descending plume from the center of the bottom plane of a rotating cold cylinder was found to occur periodically with merging of an annular cold plume into a central descending plume. When Gr/Re 2 was smaller than the critical value, a balloon-shape cold plume kept its shape, under a rotating cold cylinder, which was broken periodically due to ascending hot fluid underneath. This breakage of a cold balloon by hot fluid is considered to be responsible for periodic remelting of a crystal rod. These flow modes were clearly shown by a colour visualization technique with liquid crystals.
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