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Related Experiment Videos

Pattern formation in directional solidification under shear flow. II. Morphologies and their characterization.

Y Marietti1, J M Debierre, T M Bock

  • 1Laboratoire Matériaux et Microélectronique de Provence, Case 151, Faculté des Sciences de St. Jérôme, 13397 Marseille Cédex 20, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 21, 2001
PubMed
Summary

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Shear flow influences directional solidification patterns, causing hexagonal modulations even below the typical instability threshold. Stronger flows lead to pattern transitions and altered lattice structures.

Area of Science:

  • Materials Science
  • Physics
  • Fluid Dynamics

Background:

  • Directional solidification is crucial for materials processing.
  • Understanding pattern formation under external forces like shear flow is key.
  • Previous work established an interface equation for shear flow effects near stability limits.

Purpose of the Study:

  • Investigate pattern formation during directional solidification with shear flow.
  • Analyze the impact of flow strength on pattern transitions and morphology.
  • Characterize topological defects in flow-influenced solidification patterns.

Main Methods:

  • Asymptotic analysis near the absolute stability limit.
  • Modeling shear flow using nonlocal terms.
  • Investigating pattern transitions and lattice structure changes.

Related Experiment Videos

  • Comparing methods for characterizing morphologies and defects.

    • Main Results:

    • Shear flow induces lateral pattern drift and hexagonal modulation of stripe patterns.
    • Transcritical transition to hexagonal patterns observed at moderate flow strengths.
    • Flow-dominated morphologies emerge at large flow strengths, altering lattice structures.
    • Two distinct definitions of topological defects were analyzed and related.

    Conclusions:

    • Shear flow significantly alters directional solidification patterns, leading to novel morphologies.
    • The interplay between flow and diffusion controls pattern selection and lattice structure.
    • Characterization of topological defects is essential for understanding pattern dynamics.