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.
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January 1993
Research Papers
Effect of Turbulent Heat Transfer on Continuous Ingot Solidification
W. Shyy,
W. Shyy
Department of Aerospace Engineering, Mechanics and Engineering Science, University of Florida, Gainesville, FL 32611
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Y. Pang,
Y. Pang
GE Aircraft Engines, Engineering Materials Technology Laboratories, Lynn, MA 01910
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G. B. Hunter,
G. B. Hunter
GE Aircraft Engines, Engineering Materials Technology Laboratories, Cincinnati, OH 45215-6301
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D. Y. Wei,
D. Y. Wei
GE Aircraft Engines, Engineering Materials Technology Laboratories, Lynn, MA 01910
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M.-H. Chen
M.-H. Chen
Department of Aerospace Engineering, Mechanics and Engineering Science, University of Florida, Gainesville, FL 32611
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W. Shyy
Department of Aerospace Engineering, Mechanics and Engineering Science, University of Florida, Gainesville, FL 32611
Y. Pang
GE Aircraft Engines, Engineering Materials Technology Laboratories, Lynn, MA 01910
G. B. Hunter
GE Aircraft Engines, Engineering Materials Technology Laboratories, Cincinnati, OH 45215-6301
D. Y. Wei
GE Aircraft Engines, Engineering Materials Technology Laboratories, Lynn, MA 01910
M.-H. Chen
Department of Aerospace Engineering, Mechanics and Engineering Science, University of Florida, Gainesville, FL 32611
J. Eng. Mater. Technol. Jan 1993, 115(1): 8-16 (9 pages)
Published Online: January 1, 1993
Article history
Revised:
June 1, 1992
Online:
April 29, 2008
Citation
Shyy, W., Pang, Y., Hunter, G. B., Wei, D. Y., and Chen, M. (January 1, 1993). "Effect of Turbulent Heat Transfer on Continuous Ingot Solidification." ASME. J. Eng. Mater. Technol. January 1993; 115(1): 8–16. https://doi.org/10.1115/1.2902163
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