Abstract
The article presents a discussion of the floating-zone (FZ) problem and of the
related three-dimensional flow instability in terms of numerical simulations and
prototype applications. The difference between the "half-zone" and the "fullzone" and the related possibility to use one or the other configuration to capture the FZ fundamental hydrodynamics are elucidated. The first bifurcation of the flow is investigated in the case of semiconductor melts for various environments (microgravity and normal gravity) and geometrical parameters (wide ranges of aspect ratio and volume). In the case of Silicon the axi-symmetric flow loses its stability to a steady three-dimensional flow. The model (half or full column) used for the simulations, however, plays a critical role in determining the related azimuthal structure and critical threshold. For Pr=0.02 (Gallium) and on-ground conditions, a surprising behaviour is observed. The flow may become unstable directly to an oscillatory disturbance.
related three-dimensional flow instability in terms of numerical simulations and
prototype applications. The difference between the "half-zone" and the "fullzone" and the related possibility to use one or the other configuration to capture the FZ fundamental hydrodynamics are elucidated. The first bifurcation of the flow is investigated in the case of semiconductor melts for various environments (microgravity and normal gravity) and geometrical parameters (wide ranges of aspect ratio and volume). In the case of Silicon the axi-symmetric flow loses its stability to a steady three-dimensional flow. The model (half or full column) used for the simulations, however, plays a critical role in determining the related azimuthal structure and critical threshold. For Pr=0.02 (Gallium) and on-ground conditions, a surprising behaviour is observed. The flow may become unstable directly to an oscillatory disturbance.
| Original language | English |
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| Title of host publication | Proceedings of the 2004 International Conference on Computational & Experimental Engineering & Sciences (ICCES ' 04), July, 2004, Madeira, Portugal |
| Number of pages | 6 |
| ISBN (Electronic) | 096570016X |
| Publication status | Published - 29 Jul 2004 |
| Event | The 4th International Conference on Computational and Experimental Engineering and Science, ICCES 04 - Madeira, Portugal Duration: 26 Jul 2004 → 29 Jul 2004 |
Conference
| Conference | The 4th International Conference on Computational and Experimental Engineering and Science, ICCES 04 |
|---|---|
| City | Madeira, Portugal |
| Period | 26/07/04 → 29/07/04 |
Keywords
- Marangoni effect
- fluid-dynamics
- floating zones
- flow instability
- numerical simulations