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Related Experiment Videos

Feedback control of unstable cellular solidification fronts.

A J Pons1, A Karma, S Akamatsu

  • 1Physics Department and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, Massachusetts 02115, USA. a.pons-rivero@neu.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 16, 2007
PubMed
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This study introduces a feedback control method using local heating to stabilize unstable cellular patterns in binary alloy solidification. The technique successfully achieved uniform spacing below instability thresholds, confirmed by simulations and experiments.

Area of Science:

  • Materials Science
  • Physics
  • Chemical Engineering

Background:

  • Directional solidification of binary alloys often leads to unstable cellular patterns.
  • Maintaining uniform spacing in these patterns is crucial for material properties.

Purpose of the Study:

  • To develop and validate a feedback control scheme for stabilizing unstable cellular patterns.
  • To achieve uniform cell spacing below the threshold for period-doubling instability.

Main Methods:

  • Phase-field simulations were employed to model the process.
  • Experiments utilized real-time image processing to track cell tips.
  • A movable laser spot array provided local heating for feedback control.

Main Results:

Related Experiment Videos

  • The feedback control scheme effectively stabilized unstable cellular patterns.
  • Uniform cell spacing was achieved, even below the instability threshold.
  • Numerical predictions were validated by experimental results.

Conclusions:

  • Local heating feedback control is a feasible method for stabilizing cellular patterns.
  • The technique allows for the formation of uniform spacings in binary alloy solidification.
  • Minimal heating is sufficient to maintain stability.