Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/18927
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. |
Note: | Reproducció del document publicat a: http://dx.doi.org/10.1103/PhysRevE.75.021602 |
It is part of: | Physical Review E, 2007, vol. 75, núm. 2, p. 021602-1-021602-5 |
URI: | http://hdl.handle.net/2445/18927 |
Related resource: | http://dx.doi.org/10.1103/PhysRevE.75.021602 |
ISSN: | 1063-651X |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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