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Numerical study of solidification of A356 aluminum alloy flowing on an oblique plate with experimental validation

Kund, NK and Dutta, P (2015) Numerical study of solidification of A356 aluminum alloy flowing on an oblique plate with experimental validation. In: JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS, 51 . pp. 159-170.

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Official URL: http://dx.doi.org/10.1016/j.jtice.2015.01.002

Abstract

Molten A356 aluminum alloy flowing on an oblique plate is water cooled from underneath. The melt partially solidifies on plate wall with continuous formation of columnar dendrites. These dendrites are continuously sheared off into equiaxed/fragmented grains and carried away with the melt by producing semisolid slurry collected at plate exit. Melt pouring temperature provides required solidification whereas plate inclination enables necessary shear for producing slurry of desired solid fraction. A numerical model concerning transport equations of mass, momentum, energy and species is developed for predicting velocity, temperature, macrosegregation and solid fraction. The model uses FVM with phase change algorithm, VOF and variable viscosity. The model introduces solid phase movement with gravity effect as well. Effects of melt pouring temperature and plate inclination on hydrodynamic and thermo-solutal behaviors are studied subsequently. Slurry solid fractions at plate exit are 27%, 22%, 16%, and 10% for pouring temperatures of 620 degrees C, 625 degrees C, 630 degrees C, and 635 degrees C, respectively. And, are 27%, 25%, 22%, and 18% for plate inclinations of 30, 45, 60, and 75, respectively. Melt pouring temperature of 625 degrees C with plate inclination of 60 generates appropriate quality of slurry and is the optimum. Both numerical and experimental results are in good agreement with each other. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords: A356 aluminum alloy; Oblique plate; Semisolid slurry; Simulation; Melt pouring temperature; Plate inclination
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 31 Jul 2015 15:58
Last Modified: 31 Jul 2015 15:58
URI: http://eprints.iisc.ac.in/id/eprint/52002

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