Effect of Different Types of Nozzles on Swirling Flow Development and Shell Growth Behavior in a Bloom Casting Mold

Tang, Paul C.; Liu, S.; Lan, Haiming; Tie, Hou; Li, Z.; Wang, P.; Zhang, J.

doi:10.33313/377/138

Cited by 2 publications

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“…The scatter points of each measured value coincide well with the curves of the calculated values, indicating good reliability of the electromagnetic model for the round bloom in this study. In addition, the reliability of the coupled flow-heat transfer-solidification model has been demonstrated through several experiments [34,36,37]. The magnetic flux density and probe torque values at the center point of the stirrer were calculated and measured at different current intensities and frequencies, respectively, and plotted as shown in Figure 5.…”

Section: Numerical Model Validationmentioning

confidence: 99%

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Behavior of Mold Electromagnetic Stirring for Round Bloom Castings and Its Eccentric Stirring Problem

et al. 2022

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In this paper, a mold electromagnetic stirring (M-EMS) model was established to investigate the behavior of M-EMS for round bloom castings under different conditions, and an electromagnetic-flow-heat transfer-solidification coupling model was established to explore the problem of eccentric stirring for various formats of round blooms. The results show that the magnetic flux density decreased with the increase in the current frequency, but the electromagnetic torque increases first and then decreases with it, and the same structure of M-EMS for round blooms has the same optimal current frequency at any current intensity. The electromagnetic torque and electromagnetic force both increase as a quadratic function of the current intensity, and the electromagnetic torque, which drives the steel flow, can directly characterize the real M-EMS performance. The mold copper tube has a significant magnetic shielding effect on M-EMS, the stirring intensity decreases rapidly as the tube thickness increases, and the optimal stirring frequency decreases as well. In fact, the deviation between the stirrer center and the geometric center of the strand can result in the eccentric stirring phenomenon. When blooms with a section size of Φ350 mm are produced by Φ650 mm SMS-Concast casting machine, the upper region of the inner arc side and the lower region of the outer arc side are subject to a stronger washing effect, which makes the temperature of the inner and outer arcs show alternating differences. The jet flow from the five-port nozzle can suppress the difference in initial solidification symmetry between the inner and outer arcs of round blooms caused by eccentric stirring. This paper reveals the magnetic shielding effect of the mold copper tube and the magnetic field loss of the air between the stirrer and the inner and outer arcs of the copper, which lead to the stirring intensity and the eccentric stirring phenomenon.

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Section: Numerical Model Validationmentioning

confidence: 99%

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confidence: 99%