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Momentum Transport Modeling Including Solid Phase Movement and Nucleation for Direct Chill Casting Processes

DOI: 10.1615/ICHMT.2004.IntThermSciSemin.900
pages 717-723

Bozidar Sarler
Laboratory for Multiphase Processes, Nova Gorica Polytechnic, Vipavska 13, SI-5000, Nova Gorica, Slovenia

Darrell W. Pepper
NCACM, Department of Mechanical Engineering, University of Nevada Las Vegas, Las Vegas, NV 89154, USA

Résumé

This paper develops a simple one-phase mixture continuum model for predicting the momentum transfer in multicomponent solidification systems. The model takes into account the pure liquid, nucleation and movement of the globulitic solid phase, formation of the rigid porous solid matrix, and complete solid. The model copes with columnar and equiaxed solidification within one equation and properly describes the Newtonian fluid with variable viscosity and density in the pure liquid limit, which was not the case in previous models. The model for the first time incorporates the nucleation phenomena into one-phase model of solidification. The model has been developed for use in direct-chill (DC) and thin strip casting of aluminum alloys.

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