Localized microstructures induced by fluid flow in directional solidification - art. no. 166105

Citation
H. Jamgotchian et al., Localized microstructures induced by fluid flow in directional solidification - art. no. 166105, PHYS REV L, 8716(16), 2001, pp. 6105
Citations number
12
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8716
Issue
16
Year of publication
2001
Database
ISI
SICI code
0031-9007(20011015)8716:16<6105:LMIBFF>2.0.ZU;2-G
Abstract
The dynamical process of microstructure localization by multiscale interact ion between instabilities is uncovered in directional solidification of tra nsparent alloy. As predicted by Chen and Davis, morphological instability o f the interface is observed at inward flow-stagnation regions of the cellul ar convective field. Depending on the driving force of fluid flow, focus-ty pe and honeycomb-type localized patterns form in the initial transient of s olidification, that then evolves with time. In the case of solute-driven fl ow, the analysis of the onset of thermosolutal convection in initial transi ent of solidification enables a complete understanding of the dynamics and of the localization of morphological instability.