Convective motions in liquid metals for material processings. Numerical simulation of oscillation regimes and effect of rotation
| Autor: | Anthony Randriamampianina, Jean-Pierre Fontaine, Patrick Bontoux, G.P. Extrémet, E. Crespo del Arco |
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| Rok vydání: | 1988 |
| Předmět: |
Convection
Atmospheric Science Materials science Aspect ratio business.industry Flow (psychology) Rotational symmetry Grashof number Aerospace Engineering Crucible Astronomy and Astrophysics Mechanics Radius Physics::Fluid Dynamics Temperature gradient Geophysics Optics Space and Planetary Science General Earth and Planetary Sciences business |
| Zdroj: | Advances in Space Research. 8:265-279 |
| ISSN: | 0273-1177 |
| DOI: | 10.1016/0273-1177(88)90029-4 |
| Popis: | The paper is concerned with the numerical simulation and the analysis of some kinds of flow regimes which can develop in Bridgman and Czochralski systems for material processings. The flows in the liquid phase are investigated considering two-dimensional and axisymmetric models. The time-dependent regimes were studied for a zero-Prandtl-number fluid layer confined inside a two-dimensional cavity of aspect ratio (length-to-height) A=4, involving a stress-free upper surface and submitted to a horizontal temperature gradient. The range of Grashof number was varied up to the conditions at which the flow goes from oscillatory to chaotic type behaviours. The combined influence of the temperature gradients and of the rotations of the crucible and of the seed/crystal was investigated for a Czochralski model. The axisymmetric regimes were studied for a Prm=0.015 liquid melt confined inside a cylindrical crucible of aspect ratio (height-to-radius) Am=2, and coupled to a viscous encapsulant liquid layer (10 |
| Databáze: | OpenAIRE |
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