坯壳导电性对电磁制动结晶器多物理场的影响

doi:10.13228/j.boyuan.issn1005-4006.20200063

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Abstract Reynolds-Averaged-Navier-Stokes (RANS) method with standard k-ε model has been adopted to study the effect of the conductivity of the solidified shell on the flow field and electromagnetic field in the slab continuous casting mold under electromagnetic braking. Three different cases were simulated, 1—neglecting the conductivity of the solidified shell being, 2—setting the value of conductivity of solidified shell equal to that of the molten steel, 3—the conductivity of the solidified shell varying with temperature. The distributions of induced current density, Lorentz force, Joule heat and flow velocity were compared. The results show that, when the solidified shell is conductive, the upper recirculation is weaker while the lower recirculation is stronger, both vortex regions of upper and lower circulation become larger compared with when the insulating shell situation. The maximum value of induced current density, Joule heat and Lorentz force occur within the nozzle and jet region, having a larger value within the braking region and decreasing steeply with the distance from braking region. The numerical value and distribution range of the shell are obviously increased when the shell is conductive compared with when the shell is insulated. Under electromagnetic braking, the conductivity of solidified shell has a great effect on the flow pattern hence has to be considered in simulation. As the conductivity of solidified shell is so close to molten steel, thus leaving a little difference between case 2 and 3. Still, it can be seen that the differences induced by electrically conducting wall are slightly more distinct in the case 2 than case 3 for the flow field, the induced current density and the Joule heat.

Key words： continuous casting mold electromagnetic braking electrical conductivity solidified shell numerical simulation

Received: 21 May 2020

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	WU Ying-dong
	LIU Zhong-qiu
	LI Bao-kuan

Cite this article:

WU Ying-dong,LIU Zhong-qiu,LI Bao-kuan. Effect of conductivity of shell on multiphysics in continuous casting mold under electromagnetic braking[J]. CONTINUOUS CASTING, 2020, 39(6): 1-8.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20200063 OR http://www.chinamet.cn/Jweb_lz/EN/Y2020/V39/I6/1

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