[Some control parameters for Floating Zone growth under μg conditions]
The solid/liquid transition during crystal growth by a floating zone technique is analysed under microgravity conditions. The control of this technique by considering heating conditions and pulling velocity is studied. The difficulty attached to the phase change transition is surmounted by the use of an enthalpy–porosity formulation. The spatial distribution of the applied heating at the free surface strongly affects the dynamics of the system, the shape and position of the interface. The increase in the energy density reduces the response time of the fluid phase appearance in the transient regime. The flow near the singularity line depends more on the total energy than on the flux distribution.
La transition de phase solide/liquide en croissance cristalline par fusion de zone connue dans la littérature sous la dénomination zone flottante est analysée dans des conditions de microgravité. Le contrôle de cette configuration à travers les conditions de chauffage et de tirage du cristal est étudié. La difficulté liée à la présence de transition de phase est surmontée par une formulation de type enthalpie–porosité. La distribution spatiale du flux imposé à la surface libre affecte d'une manière significative l'hydrodynamique du système ainsi que la position et la forme de l'interface solide/liquide. L'accroissement de la densité de flux réduit le temps de réponse lié à l'apparition de la phase liquide. L'écoulement au voisinage du point singulier dépend davantage de la densité d'énergie que de sa distribution.
Keywords: Heat transfer, Thermocapillary convection, Floating Zone, Microgravity, Phase change
Rachid Bennacer 1; Mohammed El Ganaoui 2; Elalami Semma 2
@article{CRMECA_2004__332_5-6_447_0,
author = {Rachid Bennacer and Mohammed El Ganaoui and Elalami Semma},
title = {Quelques param\`etres de contr\^ole de la convection thermocapillaire en croissance par fusion de zone en microgravit\'e},
journal = {Comptes Rendus. M\'ecanique},
pages = {447--456},
publisher = {Elsevier},
volume = {332},
number = {5-6},
year = {2004},
doi = {10.1016/j.crme.2004.02.011},
language = {fr},
}
TY - JOUR AU - Rachid Bennacer AU - Mohammed El Ganaoui AU - Elalami Semma TI - Quelques paramètres de contrôle de la convection thermocapillaire en croissance par fusion de zone en microgravité JO - Comptes Rendus. Mécanique PY - 2004 SP - 447 EP - 456 VL - 332 IS - 5-6 PB - Elsevier DO - 10.1016/j.crme.2004.02.011 LA - fr ID - CRMECA_2004__332_5-6_447_0 ER -
%0 Journal Article %A Rachid Bennacer %A Mohammed El Ganaoui %A Elalami Semma %T Quelques paramètres de contrôle de la convection thermocapillaire en croissance par fusion de zone en microgravité %J Comptes Rendus. Mécanique %D 2004 %P 447-456 %V 332 %N 5-6 %I Elsevier %R 10.1016/j.crme.2004.02.011 %G fr %F CRMECA_2004__332_5-6_447_0
Rachid Bennacer; Mohammed El Ganaoui; Elalami Semma. Quelques paramètres de contrôle de la convection thermocapillaire en croissance par fusion de zone en microgravité. Comptes Rendus. Mécanique, Volume 332 (2004) no. 5-6, pp. 447-456. doi : 10.1016/j.crme.2004.02.011. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.02.011/
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