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| NUMERICAL SIMULATION OF SWIRLING FLOW IN IMMERSION NOZZLE INDUCED BY A ROTATING ELECTROMAGNETIC FIELD IN ROUND BILLET CONTINUOUS CASTING OF STEEL |
| SU Zhijian 1; LI Dewei 1; SUN Liwei 1;2; MARUKAWA Katsukiyo 3; HE Jicheng 1 |
1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education); Northeastern University; Shenyang 110004
2. Baosteel Group Corporation; Shanghai 201900
3. Sumitomo Metal Industries; Ltd.; Osaka 541–0041 |
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Cite this article:
SU Zhijian LI Dewei SUN Liwei MARUKAWA Katsukiyo HE Jicheng. NUMERICAL SIMULATION OF SWIRLING FLOW IN IMMERSION NOZZLE INDUCED BY A ROTATING ELECTROMAGNETIC FIELD IN ROUND BILLET CONTINUOUS CASTING OF STEEL. Acta Metall Sin, 2010, 46(4): 479-486.
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Abstract Swirling flow in an immersion nozzle generated with a swirl blade in it has been proved to be effective to reduce the meniscus fluctuation and homogenize the distribution of temperature in a mold during continuous casting of steel. However, this process has insuperable limitations: the swirling flow intensity can not be regulated to meet the process operation needs; the immersion nozzle with blade is liable to clog, leading to its low life span; and frequent replace of a nozzle in casting may cause operational difficulties. In this study a new process that a rotating electromagnetic field was set up around the immersion nozzle to induce a swirling flow in it by Lorentz force, has been proposed. In this case, te same effects as the swirl blade can be achieved without the above limitations. Four types electromagnetic stirrers, such as round, half round, U–shaped and modified U–shaped, were used in the simulation and their effects of structure, coil current intensity and magnetic field frequency on the magnetic field distribution and the flow filed in the immersion nozzle and mold during the round billet continuous casting of steel were numerical simulated and analyzed. The simulated results show that the magnetic flux density is the largest and magnetic field distribution is most uniform under the round electromagnetic stirrer. By using round electromagnetic stirrer, 500 A coil current intensity and 50 Hz frequency will induce a strong swirling flow and reversing flow in the mold. The distribution of flow field under the modified U–shaped stirrer is better than that under the U–shaped, and closer to that uner the round one. Considering the operational difficulty to replace the nozzle etc., the modified U–shaped electromagnetic stirrer is a better alternative to the round stirrer. The numerical simulation method has been proven to be sound by the swirling experiment of a low melting point alloy in an immersion nozzle surrounded by a round stirrer.
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Received: 27 October 2009
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| Fund: Supported by National Nature Science Foundation of China (No.50674021) and 111 Project (No.B07015) |
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