Swirling flow submerged entry nozzle technology is one of the important methods to optimise the continuous casting of steel. In this study, a novel swirling flow brick design in tundish was proposed to achieve a swirling flow submerged entry nozzle. Numerical simulations were carried out to investigate steel flow dynamic behaviour in a round mould under the effect of new designs. The results showed that a rotational steel flow was generated inside the submerged entry nozzle by using both two-inlet and three-inlet brick designs. Due to the rotational flow momentum, molten steel from the submerged entry nozzle outlet moved towards the mould wall. Such a flow pattern eliminated the impinging flow in mould, which was generally formed in conventional single-port submerged entry nozzle casting. When using swirling flow brick designs, the whole flow field in the submerged entry nozzle and mould exhibited a dynamic change. As the side-inlet number of bricks decreased from three-inlet to two-inlet, the velocity fluctuation range was reduced from ± 63.3% to ± 8.9%. Moreover, the swirling flow intensity in the submerged entry nozzle was decreased by about 40%. In addition, a high-pressure region above atmospheric pressure was obtained near the submerged entry nozzle wall by using new designs, which is helpful to prevent air from being sucked into the submerged entry nozzle.
BaiMHTongRSGeJL. Numerical simulation of fluid field of molten steel in the mold on 700 mm × 700 mm billet continuous caster. Adv Mat Res2011; 160–162: 151–156.
3.
WangYDZhangLFYangW, et al.Effect of nozzle type on fluid flow, solidification, and solute transport in mold with mold electromagnetic stirring. J Iron Steel Res Int2022; 29: 237–246.
4.
BaiMHGeJLTongRS. Simulation of temperature field of molten steel in mold for 700 mm × 700 mm billet caster. Adv Mat Res2010; 37-38: 1176–1181.
5.
XuMGZhuMY. Physical and computational study of a novel submerged entry nozzle design for twin-roll casting process. J Iron Steel Res Int2021; 28: 1390–1399.
6.
ZhangJZhangCQWangL, et al.Automatic control of slag line for submerged entry nozzle (SEN). Metallurgist2017; 60: 916–922.
7.
YangMLLiZSWeiFL, et al.Study on slag entrapment of molten steel in mold with electromagnetic stirring technology. Adv Mat Res2012; 424–425: 811–816.
8.
ZhongLCZhangMQLiuXH. Study on fluid flow in a large round bloom continuous casting mold. Adv Mat Res2012; 402: 196–201.
9.
LiXTZhangZHLvM, et al.Numerical simulation of the fluid flow, heat transfer, and solidification in ultrahigh speed continuous casting billet mold. Steel Res Int2022; 93: 2100673.
10.
XuPZhouYZChenDF, et al.Optimization of submerged entry nozzle parameters for ultra-high casting speed continuous casting mold of billet. J Iron Steel Res Int2022; 29: 44–52.
11.
GuoDWHouZBCaoJH. Prediction of maximum carbon element content in continuous casting billets of 82B cord steel based on statistics of extreme values method. J Iron Steel Res Int2020; 27: 1163–1169.
12.
MertenDCHüttMTUygunY. Effect of slab width on choice of appropriate casting speed in steel production. J Iron Steel Res Int2022; 29: 71–79.
13.
JiangZKSuZJXuCQ, et al.Abnormal mold level fluctuation during slab casting of peritectic steels. J Iron Steel Res Int2020; 27: 160–168.
14.
YangBDengAYLiY, et al.Numerical simulation of flow and solidification in continuous casting process with mold electromagnetic stirring. J Iron Steel Res Int2019; 26: 219–229.
15.
JiangDBZhangLFWangYD. Effect of mold electromagnetic stirring on solidification structure and solute segregation in continuous casting bloom. J Iron Steel Res Int2022; 29: 124–131.
16.
YuHQZhuMY. Influence of electromagnetic stirring on transport phenomena in round billet continuous casting mould and macrostructure of high carbon steel billet. Ironmak Steelmak2012; 39: 574–584.
17.
SahooPPKumarAHalderJ, et al.Optimisation of electromagnetic stirring in steel billet caster by using image processing technique for improvement in billet quality. ISIJ Int2009; 49: 521–528.
18.
GuanRJiCZhuMY. Modeling the effect of combined electromagnetic stirring modes on macrosegregation in continuous casting blooms. Metall Mater Trans B2020; 51: 1137–1153.
19.
YangYWLuoSWangWL, et al.Multiphase solidification modeling of solidification structure evolution and macrosegregation of round bloom continuous casting process with mold electromagnetic stirring and final electromagnetic stirring. Steel Res Int2024; 95: 2300446.
20.
LiXLLiBKLiuZQ, et al.Large eddy simulation of electromagnetic three-phase flow in a round bloom considering solidified shell. Steel Res Int2019; 90: 1800133.
21.
YokoyaSAsakoYHaraS, et al.Control of immersion nozzle outlet flow pattern through the use of swirling flow in continuous casting. ISIJ Int1994; 34: 883–888.
22.
YokoyaSWestoffRAsakoY, et al.Numerical study of immersion nozzle outlet flow pattern with swirling flow in continuous casting. ISIJ Int1994; 34: 889–895.
23.
TsukaguchiYHayashiHKurimotoH, et al.Development of swirling-flow submerged entry nozzles for slab casting. ISIJ Int2010; 50: 721–729.
24.
YokoyaSTakagiSIguchiM, et al.Swirling effect in immersion nozzle on flow and heat transport in billet continuous casting mold. ISIJ Int1998; 38: 827–833.
25.
YokoyaSJönssonPGSasakiK, et al.The effect of swirl flow in an immersion nozzle on the heat and fluid flow in a billet continuous casting mold. ISIJ Int2004; 33: 22–28.
26.
LiDWSuZJChenJ, et al.Effects of electromagnetic swirling flow in submerged entry nozzle on square billet continuous casting of steel process. ISIJ Int2013; 53: 1187–1194.
27.
WuCLWangQLiDW, et al.Macrosegregation under new flow pattern and temperature distribution induced by electromagnetic swirling flow in nozzle during continuous casting of square billet. J Mater Res Technol2020; 9: 5630–5639.
28.
YokoyaSAsakoYHaraS, et al.Control of immersion nozzle outlet flow pattern through the use of swirling flow in continuous casting. ISIJ Int1994; 34: 883–888.
29.
WuCLLiuXMWangQ, et al.Macrosegregation prediction by evaluating liquid level fluctuation in round billet continuous casting with electromagnetic nozzle swirling flow. Metall Mater Trans B2021; 52: 3571–3575.
30.
LiDWSuZJMarukawaK, et al.Simulation on effect of divergent angle of submerged entry nozzle on flow and temperature fields in round billet mold in electromagnetic swirling continuous casting process. J Iron Steel Res Int2014; 21: 159–165.
31.
SunHBZhangJQ. Macrosegregation improvement by swirling flow nozzle for bloom continuous castings. Metall Mater Trans B2014; 45: 936–946.
32.
SunHBZhangJQ. Effect of feeding modes of molten steel on the mould metallurgical behavior for round bloom casting. ISIJ Int2011; 51: 1657–1663.
33.
LinPJinYYangF, et al.A simulation and optimization study of the swirling nozzle for eccentric flow fields of round molds. Metals2020; 10: 91.
34.
NiPYJonssonLTIErssonM, et al.A new tundish design to produce a swirling flow in the SEN during continuous casting of steel. Steel Res Int2016; 87: 1356–1365.
35.
NiPYJonssonLTIErssonM, et al.Non-Metallic inclusion behaviors in a new tundish and SEN design using a swirling flow during continuous casting of steel. Steel Res Int2017; 88: 1600155.
36.
NiPYJonssonLTIErssonM, et al.Application of a swirling flow producer in a conventional tundish during continuous casting of steel. ISIJ Int2017; 57: 2175–2184.
37.
NiPYWangDXJonssonLTI, et al.Numerical and physical study on a cylindrical tundish design to produce a swirling flow in the SEN during continuous casting of steel. Metall Mater Trans B2017; 48: 2695–2706.
38.
NiPYErssonMJonssonLTI, et al.A study on the nonmetallic inclusion motions in a swirling flow submerged entry nozzle in a new cylindrical tundish design. Metall Mater Trans B2018; 49: 723–736.
39.
NiPYErssonMJonssonLTI, et al.Effect of immersion depth of a swirling flow tundish SEN on multiphase flow and heat transfer in mold. Metals2018; 8: 10.
40.
NiPYErssonMJonssonLTI, et al.Numerical study on the influence of a swirling flow tundish on multiphase flow and heat transfer in mold. Metals2018; 8: 68.
41.
XieQHNabeelMErssonM, et al.A review on swirling flow casting technology in steel production. Steel Res Int2022; 93: 2100410.
42.
XieQHNiPYTanakaT, et al.Flow field, heat transfer and inclusion behavior in a round bloom mold under effect of a swirling flow submerged entry nozzle. J Iron Steel Res Int2023; 30: 1211–1221.
43.
QinXFChengCGLiY, et al.Numerical study on a new swirling flow pocket brick for tundish upper nozzle during continuous casting of steel. Ironmak Steelmak2023; 50: 1489–1501.
44.
LiYBLiJZhuFC, et al.Effect of bubble size and spatial distribution on the flow and mixing of steel. Ironmak Steelmak2023; 50: 1551–1558.
45.
ShihTHLiouWWShabbirA, et al.A new k–ɛ eddy viscosity model for high Reynolds number turbulent flows. Comput Fluids1995; 24: 227–238.
46.
WangZYLiRYZongYB, et al.Simulation of the flow, temperature, and concentration fields in the reactor of the Hismelt process. Ironmak Steelmak2022; 49: 968–975.
47.
ZhouXBZhaoZSWangWX, et al.Physical and mathematical simulation on the bubble entrainment behavior at slag-metal interface. Acta Metall Sin2023; 59: 1523–1532.
48.
WangZHYangSLKongDS, et al.Numerical investigation of sinusoidal pulsating gas intake to intensify the gas-slag momentum transfer in the top-blown smelting furnace. Int J Miner Metall Mater2024; 31: 301–314.
49.
YokoyaSTakagiSIguchiM, et al.Development of swirling flow generator in immersion nozzle. ISIJ Int2000; 40: 584–588.
50.
WangYDChenWJiangDB, et al.Effect of the gap between copper mold and solidified shell on the fluid flow in the continuous casting strand with mold electromagnetic stirring. Steel Res Int2020; 91: 1900470.
