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RESEARCH PAPERS: Papers on Heat and Mass Transfer in Solidification Processing

Effect of Turbulent Heat Transfer on Continuous Ingot Solidification

[+] Author and Article Information
W. Shyy, M.-H. Chen

Department of Aerospace Engineering, Mechanics and Engineering Science, University of Florida, Gainesville, FL 32611

Y. Pang, D. Y. Wei

GE Aircraft Engines, Engineering Materials Technology Laboratories, Lynn, MA 01910

G. B. Hunter

GE Aircraft Engines, Engineering Materials Technology Laboratories, Cincinnati, OH 45215-6301

J. Eng. Mater. Technol 115(1), 8-16 (Jan 01, 1993) (9 pages) doi:10.1115/1.2902163 History: Revised June 01, 1992; Online April 29, 2008

Abstract

For many continuous ingot casting processes, turbulent heat transfer in the molten pool plays a critical role which, along with buoyancy and surface tension, is responsible for the quality of the end products. Based on a modified low Reynolds number k-ε two-equation closure, accounting for the phase change and mushy zone formation, the effect of turbulent heat transfer on the solidification characteristics during titanium alloy ingot casting in an electron beam melting process is investigated. The overall heat transfer rate is enhanced by turbulent transport via two sources, one through the correlated velocity and temperature fluctuations present for both single- and multi-phase flows, and the other through the correlated velocity and release of latent heat fluctuations which are unique to the flows with phase change. The roles played by both mechanisms are identified and assessed. The present turbulence model predicts that although the mushy zone defined by the mean temperature field is generally of substantial thickness as a result of the convection effect, the actual instantaneous zone thickness varies substantially due to turbulence effect. This finding is in contrast to the traditionally held viewpoint, based on the conduction analysis, of a generally thin mushy zone. The impact of turbulent heat transfer on local dendrite formation and remelting is illustrated and the issues involved in model development highlighted.

Copyright © 1993 by The American Society of Mechanical Engineers
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