Abstract
The interfacial mass transfer rate between the endwall and the bulk liquid in a vertical Bridgman configuration was measured during spin-up and spin-down (ACRT). The enhancement of mass transfer rate caused by spin-up and spin-down persisted much longer than the Ekman time after an impulsive change of the ampoule rotation rate. A periodic fluctuation of mass transfer rate was observed during short period ACRT. Directional solidification of Te-doped InSb with ACRT in a vertical Bridgman-Stockbarger furnace produced striations in the crystals. Application of current interface demarcation (CID) showed that the growth rate varied during each ACRT cycle. Several CID-induced striations were missing, suggesting that backmelting occurred during each ACRT cycle.
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