Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/18927
Feedback control of unstable cellular solidification fronts
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
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.
Matèries (anglès)
Citació
Citació
PONS, A. j., KARMA, A., AKAMATSU, S., NEWEY, M., POMERANCE, A., SINGER, H., LOSERT, W.. Feedback control of unstable cellular solidification fronts. _Physical Review E_. 2007. Vol. 75, núm. 2, pàgs. 021602-1-021602-5. [consulta: 14 de gener de 2026]. ISSN: 1063-651X. [Disponible a: https://hdl.handle.net/2445/18927]