Localized microstructures induced by fluid flow in directional solidification

Localized microstructures induced by fluid flow in directional solidification

The dynamical process of microstructure localization by multiscale interaction between instabilities is uncovered in directional solidification of transparent alloy. As predicted by Chen and Davis, morphological instability of the interface is observed at inward flow-stagnation regions of the cellul...

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Veröffentlicht in:Physical review letters 2001-10, Vol.87 (16), p.166105-166105, Article 166105
Hauptverfasser: Jamgotchian, H, Bergeon, N, Benielli, D, Voge, P, Billia, B, Guérin, R
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container_end_page 166105
container_issue 16
container_start_page 166105
container_title Physical review letters
container_volume 87
creator Jamgotchian, H
Bergeon, N
Benielli, D
Voge, P
Billia, B
Guérin, R
description The dynamical process of microstructure localization by multiscale interaction between instabilities is uncovered in directional solidification of transparent alloy. As predicted by Chen and Davis, morphological instability of the interface is observed at inward flow-stagnation regions of the cellular convective field. Depending on the driving force of fluid flow, focus-type and honeycomb-type localized patterns form in the initial transient of solidification, that then evolves with time. In the case of solute-driven flow, the analysis of the onset of thermosolutal convection in initial transient of solidification enables a complete understanding of the dynamics and of the localization of morphological instability.
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title Localized microstructures induced by fluid flow in directional solidification
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