By introducing a sinusoidal cylindric ripple of infinitesimal amplitude into aplanar interface when there is convection in the liquid,an expression q(ω)=(t)/δ(t)isobtained for determining the stability of planar interface.The destabilizing perturbationfrequency interval and dangerous frequency for planar interface during solidification of adilute binary alloy under the condition of a sinusoidal cylindric perturbation have been in-vestigated.In comparison with the sinusoidal planar perturbation,the results obtained aremore conformable with the actual situation.
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