The mechanical and electrical properties of crystals produced by a unidirectional process depend strongly on the temperature and flow fields since these control the concentration of solute at the melt-crystal interface. The solute gradient there drives morphological instabilities that lead to cellular or dendritic interfaces. Several features of flow-solidification interactions are discussed. These include the effects of convection driven by density changes and buoyancy and the imposition of forced flow. It is clear that the coupling between phase transformation and fluid flow is very complex in that the crystal-melt interface is a free boundary which is the site of the interaction of diffusion, conduction, flow and thermodynamic kinetics.
|Original language||English (US)|
|Number of pages||3|
|Journal||European Space Agency, (Special Publication) ESA SP|
|State||Published - Dec 1 1989|
ASJC Scopus subject areas
- Aerospace Engineering