Dynamics of low anisotropy morphologies in directional solidification

Utter, B.; Bodenschatz, E.

doi:10.1103/PhysRevE.66.051604

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Dynamics of low anisotropy morphologies in directional solidification

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Bodenschatz, E.
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Utter, B., & Bodenschatz, E. (2002). Dynamics of low anisotropy morphologies in directional solidification. Physical Review E, 66(5): 051604. doi:10.1103/PhysRevE.66.051604.

Cite as: https://hdl.handle.net/21.11116/0000-0003-FD55-1

Abstract

We report experimental results on quasi-two-dimensional diffusion limited growth in directionally solidified succinonitrile with small amounts of poly(ethylene oxide), acetone, or camphor as a solute. Seaweed growth, or dense branching morphology, is selected by growing grains close to the {111} plane, where the in-plane surface tension is nearly isotropic. The observed growth morphologies are very sensitive to small anisotropies in surface tension caused by misorientations from the {111} plane. Different seaweed morphologies are found, including the degenerate, the stabilized, and the strongly tilted seaweeds. The degenerate seaweeds show a limited fractal scaling range and, with increased undercooling, suggests a transition from "fractal" to "compact" seaweed. Strongly tilted seaweeds demonstrate a significant twofold anisotropy. In addition, seaweed-dendrite transitions are observed in low anisotropy growth.