| Summary: | 碩士 === 國立臺灣大學 === 機械工程學系 === 85 === This study numerically investigate the binary
solidification system which is cooled from the side wall. The
binary solution is in a two-dimensional rectangular cavity
with upper and lower adiabatic walls and two isothermal side
walls. The single-phase numerical method and volume-average
method are used to derive the governing equations. The mushy
zone is assumed isotropic and the concentration of crystals is
assumed uniform. After comparing with the experimental results,
it is proved that the n The surface tension effect is
obvious in the binary solidification system with a free surface.
From the numerical results, several interesting conclusion can
be attained: (1) Higher cooling temperature prevents the
remelting phenomena in the mushy zone because of the
interdendrite solution reduction. (2) Lower warm temperature
changes the characteristic of the solidification flow field.
(3) Under the microgravity condition, the remelting phenomena
still occurred because of the surface tension. (4)Under the
normal gravity condition, mushy zone thickness increases from
top to bottom
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