Feedback control of unstable cellular solidification fronts
摘要
We present a numerical and experimental study of feedback control of unstable cellular patterns in directional solidification (DS). The sample, a dilute binary alloy, solidifies in a 2D geometry under a control scheme which applies local heating close to the cell tips which protrude ahead of the other. For the experiments, we use a real-time image processing algorithm to track cell tips, coupled with a movable laser spot array device, to heat locally. We show, 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, and the spacing becomes uniform through feedback control which is maintained with minimal heating.
引用
@article{arxiv.cond-mat/0608331,
title = {Feedback control of unstable cellular solidification fronts},
author = {A. J. Pons and A. Karma and S. Akamatsu and M. Newey and A. Pomerance and H. Singer and W. Losert},
journal= {arXiv preprint arXiv:cond-mat/0608331},
year = {2015}
}
备注
4 pages, 4 figures, 1 table