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. Bontoux<sup>3

1</sup>  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.

© EDP Sciences 2001