單向固化中引發液柱對流之流力機制研究(3/3)
Date Issued
2004-10-31
Date
2004-10-31
Author(s)
DOI
922212E002034
Abstract
In directional solidification of binary alloys, a dendritic mush is formed between the
bulk melt above and the eutectic solid below. We investigate the convective
instabilities in such a three-layer system during solidification process, which differs
from previous two-layer model by the solid layer. Due to the existence of the solid
layer, the mush/solid interface is allowed to deform so that the mushy layer becomes
less stable while the stability of the melt is virtually unchanged. The mushy layer also
becomes less stable when the latent heat of fusion generated in the mush is larger,
while the stability of the melt above is not affected because the heat is transferred
through the solid layer towards the cooling boundary below. Present results may help
reflect the reality that the heat transferring to the cooling boundary decreases with
time so that the stability of the mush will be enhanced during solidification process,
and explain the discrepancy between former theoretical predictions and experimental
measurements.
Publisher
臺北市：國立臺灣大學應用力學研究所
Type
report
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