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2007

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/18927

Feedback control of unstable cellular solidification fronts

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http://dx.doi.org/10.1103/PhysRevE.75.021602

Abstract

We present a feedback control scheme to stabilize unstable cellular patterns during the directional solidification of a binary alloy. The scheme is based on local heating of cell tips which protrude ahead of the mean position of all tips in the array. The feasibility of this scheme is demonstrated using phase-field simulations and, experimentally, using a real-time image processing algorithm, to track cell tips, coupled with a movable laser spot array device to heat the tips locally. We demonstrate, both numerically and experimentally, that spacings well below the threshold for a period-doubling instability can be stabilized. As predicted by the numerical calculations, cellular arrays become stable with uniform spacing through the feedback control which is maintained with minimal heating.

Subject

Ciència dels materials, Equacions d'estat, Regla de les fases i equilibri, Ciència dels materials

Subject (English)

Materials science, Equations of state, Phase rule and equilibrium

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Articles publicats en revistes (Ciència dels Materials i Química Física)

Citation

PONS, A. J., et al. Feedback control of unstable cellular solidification fronts. Physical Review E. 2007. Vol. 75, num. 2, pags. 021602-1-021602-5. ISSN 1063-651X. [consulted: 9 of June of 2026]. Available at: https://hdl.handle.net/2445/18927

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