Sciences de la matière et microgravité
J. Phys. IV France 11 (2001) Pr6-135-Pr6-142
DOI: 10.1051/jp4:2001616
Effect of thermal convection on directional solidification of succinonitrile-acetone alloys : Comparison between experimental and numerical studies
D. Benielli1, M. El Ganaoui2, E. Semma3, N. Bergeon1, H. Jamgotchian1, P. Voge1, B. Billia1 and P. Bontoux31 Laboratoire L2MP, Université d'Aix Marseille III, UMR 6137 du CNRS, Faculté des Sciences et Techniques de Saint Jérôme, Case 151, 13397 Marseille cedex 20, France
2 Sciences des Procédés Céramiques et des Traitements de Surface (SPCTS), UMR 6638 du CNRS, Faculté des Sciences de Limoges, 123 avenue Albert Thomas, 87060 Limoges cedex, France
3 LABM, UMR 2164 du CNRS, Département de Modélisation Numérique, Université d'Aix Marseille II, 38 Joliot Curie, 13451 Marseille, France
Abstract
In directional growth, the coupling of convection and solid-liquid interface morphology is pointed out. Experimental and numerical results are compared. Experimentally, the solid-liquid interface of transparent succinonitrile-acetone samples is characterized in situ by direct observation and interferometric techniques to study its motion. Numencally, the computational model based on the enthalpy-porosity formulation and finite volume approximation developed for a configuration close to experimental one. Effect of convection on solid-liquid interface morphology is studied in terms of modification of macroscopic interface shape and position which in turn influences the morphological instability dynamics.
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