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Vortex characteristics due to nozzle clogging in water caster mould: modelling and validation
Canadian Metallurgical Quarterly ( IF 1.3 ) Pub Date : 2018-12-27 , DOI: 10.1080/00084433.2018.1560662
Peri Subrahmanya Srinivas 1, 2 , Deepak Kumar Mishra 3 , Raghvendra Gupta 3 , Jose Martin Korath 1 , Amiya Kumar Jana 1
Affiliation  

ABSTRACT In continuous slab casting, clogging in the submerged entry nozzle (SEN) ports leads to flow asymmetry and vortex formation in the mould. Knowledge of vortexing and its influence on product quality is fundamental for defect-free production. In this study, the interconnected effects of nozzle clogging and SEN submergence depth, variation on flow asymmetry and vortex characteristics in a 0.4 scale water caster have been characterised by CFD investigation and validated with experimental results from the authors’ previous work. Mean flow velocities at the sub-meniscus and near the port exit predicted by the computational model are compared with the time-averaged values of the impeller probe velocity measurements and found to be in reasonable agreement. Three different clogging conditions (0, 33 and 66% in the left port of the SEN) for SEN submergence depth of 60 mm are studied and the 66% clogging produced vortices having largest diameter, which is consistent with the experimental observations. The effects of SEN submergence depth on flow asymmetry and vortexing are investigated with three different conditions – 40, 60 and 80 mm. It is found that the shallow SEN submergence depth (40 mm) produces vortices of largest diameter and the flow is most stable for a SEN submergence depth of 60 mm among the three cases. Vortex bending towards the SEN as noticed in the experimental observations is also observed in the computational study. This work illustrates the possibility of capturing features of vortexing using validated CFD model.

中文翻译:

水铸模具中喷嘴堵塞引起的涡流特性:建模和验证

摘要 在板坯连铸中,浸入式喷嘴 (SEN) 端口的堵塞会导致模具中的流动不对称和涡流形成。涡流知识及其对产品质量的影响是无缺陷生产的基础。在这项研究中,喷嘴堵塞和 SEN 浸没深度、流动不对称性变化和涡流特性在 0.4 级水铸机中的相互关联影响已通过 CFD 研究进行表征,并通过作者先前工作的实验结果进行了验证。将计算模型预测的子弯液面处和端口出口附近的平均流速与叶轮探针速度测量的时间平均值进行比较,发现它们具有合理的一致性。三种不同的堵塞条件(0, 33% 和 66% 在 SEN 的左端口)对 60 mm 的 SEN 浸没深度进行了研究,66% 的堵塞产生了直径最大的涡流,这与实验观察结果一致。SEN 淹没深度对流动不对称和涡流的影响在三种不同的条件下进行研究——40、60 和 80 毫米。结果表明,在三种情况下,浅 SEN 淹没深度(40 mm)产生直径最大的涡流,SEN 淹没深度为 60 mm 时流动最稳定。在计算研究中也观察到在实验观察中注意到的向 SEN 弯曲的涡流。这项工作说明了使用经过验证的 CFD 模型捕获涡流特征的可能性。这与实验观察一致。SEN 淹没深度对流动不对称和涡流的影响在三种不同的条件下进行研究——40、60 和 80 毫米。结果表明,在三种情况下,SEN 浸没深度较浅(40 mm)产生直径最大的涡流,SEN 浸没深度为 60 mm 时流动最稳定。在计算研究中也观察到在实验观察中注意到的向 SEN 弯曲的涡流。这项工作说明了使用经过验证的 CFD 模型捕获涡流特征的可能性。这与实验观察一致。SEN 淹没深度对流动不对称和涡流的影响在三种不同的条件下进行研究——40、60 和 80 毫米。结果表明,在三种情况下,浅 SEN 淹没深度(40 mm)产生直径最大的涡流,SEN 淹没深度为 60 mm 时流动最稳定。在计算研究中也观察到在实验观察中注意到的向 SEN 弯曲的涡流。这项工作说明了使用经过验证的 CFD 模型捕获涡流特征的可能性。结果表明,在三种情况下,浅 SEN 淹没深度(40 mm)产生直径最大的涡流,SEN 淹没深度为 60 mm 时流动最稳定。在计算研究中也观察到在实验观察中注意到的向 SEN 弯曲的涡流。这项工作说明了使用经过验证的 CFD 模型捕获涡流特征的可能性。结果表明,在三种情况下,浅 SEN 淹没深度(40 mm)产生直径最大的涡流,SEN 淹没深度为 60 mm 时流动最稳定。在计算研究中也观察到在实验观察中注意到的向 SEN 弯曲的涡流。这项工作说明了使用经过验证的 CFD 模型捕获涡流特征的可能性。
更新日期:2018-12-27
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