Physical and numerical characterization of the near-eutectic permeability of aluminum–copper alloys / Ehsan Khajeh in Acta materialia, Vol. 58 N° 19 (Novembre 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6334–6344 Titre : Physical and numerical characterization of the near-eutectic permeability of aluminum–copper alloys Type de document : texte imprimé Auteurs : Ehsan Khajeh, Auteur ; Daan M. Maijer, Auteur Année de publication : 2011 Article en page(s) : pp. 6334–6344 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Permeability 3-D X-ray microtomography Modeling Microstructure Aluminum–copper alloy Résumé : The near-eutectic permeability of aluminum–copper alloys has been determined through physical and numerical modeling. The physical models are large-scale analogues of interdendritic structures produced by a rapid prototyping technique from three-dimensional (3-D) geometries obtained by X-ray microtomography. A glycerin-based solution was passed through the physical models and the permeability was calculated from measurements of the discharge flow rate and pressure drop. Mathematical models, considering the continuity and momentum equations, were developed for the corresponding unstructured meshes of the 3-D geometries used for the physical models. The numerically determined values of permeability are in good agreement with those measured. With the aid of this 3-D characterization, it is possible to distinguish between isolated liquid regions that are prevalent at high solid fractions and those liquid channels that contribute to interdendritic flow. The work presented in this study highlights the attention that must be paid to numerical calculations of fluid flow in the mushy zone and presents an alternative technique to determine permeability compared to conventional permeameters. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410004994 [article] Physical and numerical characterization of the near-eutectic permeability of aluminum–copper alloys [texte imprimé] / Ehsan Khajeh, Auteur ; Daan M. Maijer, Auteur . - 2011 . - pp. 6334–6344. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6334–6344 Mots-clés : Permeability 3-D X-ray microtomography Modeling Microstructure Aluminum–copper alloy Résumé : The near-eutectic permeability of aluminum–copper alloys has been determined through physical and numerical modeling. The physical models are large-scale analogues of interdendritic structures produced by a rapid prototyping technique from three-dimensional (3-D) geometries obtained by X-ray microtomography. A glycerin-based solution was passed through the physical models and the permeability was calculated from measurements of the discharge flow rate and pressure drop. Mathematical models, considering the continuity and momentum equations, were developed for the corresponding unstructured meshes of the 3-D geometries used for the physical models. The numerically determined values of permeability are in good agreement with those measured. With the aid of this 3-D characterization, it is possible to distinguish between isolated liquid regions that are prevalent at high solid fractions and those liquid channels that contribute to interdendritic flow. The work presented in this study highlights the attention that must be paid to numerical calculations of fluid flow in the mushy zone and presents an alternative technique to determine permeability compared to conventional permeameters. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410004994

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