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Title: Feedback control of unstable cellular solidification fronts
Author: Pons, A. J.
Karma, A.
Akamatsu, S.
Newey, M.
Pomerance, A.
Singer, H.
Losert, W.
Keywords: Ciència dels materials
Equacions d'estat
Regla de les fases i equilibri
Ciència dels materials
Materials science
Equations of state
Phase rule and equilibrium
Issue Date: 2007
Publisher: The American Physical Society
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.
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It is part of: Physical Review E, 2007, vol. 75, núm. 2, p. 021602-1-021602-5
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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