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Numerical study of flow and heat transfer behaviors during direct-chill casting of large-size magnesium alloy billet under pulsed magnetic field

Wenchao Duan (Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China and College of Materials Science and Engineering, Northeastern University, Shenyang, China)
Siqi Yin (Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China and College of Materials Science and Engineering, Northeastern University, Shenyang, China)
Wenhong Liu (College of Information Science and Engineering, Northeastern University, Shenyang, China)
Jian Yang (College of Information Science and Engineering, Northeastern University, Shenyang, China)
Qingfeng Zhu (Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China and College of Materials Science and Engineering, Northeastern University, Shenyang, China)
Lei Bao (Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China and College of Materials Science and Engineering, Northeastern University, Shenyang, China)
Ping Wang (Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China and College of Materials Science and Engineering, Northeastern University, Shenyang, China)
Jianzhong Cui (Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China and College of Materials Science and Engineering, Northeastern University, Shenyang, China)
Zhiqiang Zhang (Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, China and College of Materials Science and Engineering, Northeastern University, Shenyang, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 1 July 2020

Issue publication date: 10 March 2021

316

Abstract

Purpose

The purpose of this paper is to investigate the effect of pulsed magnetic field (PMF) with different duty cycles on the melt flow and heat transfer behaviors during direct-chill (DC) casting of large-size magnesium alloy billet and find the appropriate range of duty cycle.

Design/methodology/approach

A transient two-dimensional mathematical model coupled electromagnetic field, flow field and thermal field, is conducted to study the melt flow and temperature field under PMF and compared with that under the harmonic magnetic field.

Findings

The results reveal that melt vibration and fluctuation are generated due to the instantaneous impact of repeated thrust and pull effects of Lorentz force under PMF. The peak of Lorentz force decreases greatly with the increasing duty cycle, but the melt fluctuation region is expanded with higher duty cycle, which accelerates the interior melt velocity and reduces the temperature gradient at the liquid-solid interface. However, PMF with overly high duty cycle has adverse effect on the melt convection and limited influence on the interior melt. A duty cycle of 20% to 50% is a reasonable range.

Practical implications

This paper can provide guiding significance for the setting of duty cycle parameters on DC casting under PMF.

Originality/value

There are few reports on the effect of PMF parameters during DC casting with applying PMF, especially for duty cycle, a parameter unique to PMF. The findings will be helpful for applying the external field of PMF on DC casting.

Keywords

Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFB0301101 and 2017YFB0305504), the National Natural Science Foundation of China (Grant No. 51971054), the Fundamental Research Funds for the Central Universities (Grant No. N180904006 and N2009006).

Conflict of interest: None.

Citation

Duan, W., Yin, S., Liu, W., Yang, J., Zhu, Q., Bao, L., Wang, P., Cui, J. and Zhang, Z. (2021), "Numerical study of flow and heat transfer behaviors during direct-chill casting of large-size magnesium alloy billet under pulsed magnetic field", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 31 No. 3, pp. 829-857. https://doi.org/10.1108/HFF-11-2019-0825

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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