Numerical simulation of the transient flow in the continuous casting of slab under the impact of travelling and combined electromagnetic fields
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Continuous casting is the main method of steel production, with over 96 percent worldwide. Thus, optimizing this process can heavily impact the steel manufacturing costs. The application of electromagnetic fields in the continuous casting of slabs is a well-known method to control the flow field inside the cast strand. If applied properly, electromagnetic fields can result in an improved flow behavior, consequently, minimizing the product defects. Electromagnetic fields are divided into two major categories: static and traveling magnetic fields. Electromagnetic Braking (EMBr) systems use static magnetic fields to stabilize the flow, especially in high casting speed situations. To control the liquid steel flow more actively, travelling magnetic field systems with their greater capability to impact the steel flow were developed. Three different moving fields can be generated: Electromagnetic Level Stabilizer (EMLS), Electromagnetic Level Accelerator (EMLA), and Electromagnetic Rotating Stirrer (EMRS). Depending on the flow situation in the mould region, and the need for acceleration, deceleration, or stirring, each of these modes can be activated. Any combination of these traveling magnetic fields with static magnetic field is also possible. Although this combination makes the flow field much more complex, it provides simultaneous flow control in the whole mould region (both above and below the submerged jets).
The impact of EMRS without and with EMBR (combined mode) on the mould flow pattern was investigated in the current work. The results show that the surface velocities can be homogenized and increased due to EMRS. The combination with EMBr can cause homogenized surface velocities and reduced jet penetration length.