Three-dimensional double-diffusive convection and macrosegregation during non-equilibrium solidification of binary mixtures

Chakraborty, S and Dutta, P (2003) Three-dimensional double-diffusive convection and macrosegregation during non-equilibrium solidification of binary mixtures. In: International Journal of Heat and Mass Transfer, 46 (12). pp. 2115-2134.

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Abstract

A three-dimensional transient mathematical model (following a fixed-grid enthalpy-based continuum formulation) is used to study the interaction of double-diffusive natural convection and non-equilibrium solidification of a binary mixture in a cubic enclosure cooled from a side. Investigations are carried out for two separate test systems, one corresponding to a typical model "metal-alloy analogue" system and other corresponding to a real metal-alloy system. Due to stronger effects of solutal buoyancy in actual metal-alloy systems than in corresponding analogues, the convective transport mechanisms for the two cases are quite different. However, in both cases, similar elements of three-dimensionality are observed in the curvature and spacing of the projected streamlines. As a result of three-dimensional convective flow patterns, a significant solute macrosegregation is observed across the transverse sections of the cavity, which cannot be captured by two-dimensional simulations. (C) 2003 Elsevier Science Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	International Journal of Heat and Mass Transfer
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	25 Aug 2011 05:43
Last Modified:	25 Aug 2011 05:43
URI:	http://eprints.iisc.ac.in/id/eprint/40292

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