The possibility of using steady uniform rotation about a vertical axis to suppress the onset of buoyancy-driven convection during solidification of a binary alloy is considered using a linear stability analysis. For Pb-Sn alloys, our results clearly show that the onset of convection in a horizontally unbounded layer can be suppressed significantly at modest rotation rates. Specifically, "plane-front" solidification is linearly stable at higher Sn concentrations in a rotating configuration than in a nonrotating one. The predicted inhibitory effects of rotation on convection are discussed in terms of previous experimental and theoretical studies of the effect of rotation on the onset of buoyancy-driven convection in single-component fluids heated from below and in binary fluids subject to thermal and solutal stratification.
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