Chetan Mali, A. Rai, Navam Shrivastava, Prasanth Anand Kumar Lam
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引用次数: 0
Abstract
ABSTRACT In a continuous hot-dip galvanizing process, the opposite air jets from the air knife nozzles collide with each other in the region near the steel strip edges, causing complex 3D von Kármán vortices. The vortices alter the pressure gradient of wiping air jet over the steel strip edge surfaces, causing uneven coating thickness. Here, the effects of the excess air vortices on zinc coating distribution at the edges are investigated with 3D eddy structures in the region of collision using detached eddy simulation (DES). The wiping pressure and shear stresses, obtained numerically, were used as boundary conditions in an analytical model to predict the stagnation line – a bottleneck region in the zinc wiping process. In comparison with experiments, the proposed analytical model successfully computes the quantity of zinc dragged upward by wiping air and the transient variations in coating values near steel strip edges.
摘要在连续热浸镀锌过程中，来自气刀喷嘴的相反空气射流在靠近钢带边缘的区域相互碰撞，导致复杂的3D von Kármán涡流。涡流改变了在钢带边缘表面上擦拭空气射流的压力梯度，导致涂层厚度不均匀。在此，使用分离涡流模拟（DES），利用碰撞区域的三维涡流结构研究了过量空气涡流对边缘锌涂层分布的影响。数值获得的擦拭压力和剪切应力被用作分析模型中的边界条件，以预测停滞线——锌擦拭过程中的瓶颈区域。与实验相比，所提出的分析模型成功地计算了通过擦拭空气向上拖动的锌的量以及钢带边缘附近涂层值的瞬态变化。
期刊介绍：
Ironmaking & Steelmaking: Processes, Products and Applications monitors international technological advances in the industry with a strong element of engineering and product related material. First class refereed papers from the international iron and steel community cover all stages of the process, from ironmaking and its attendant technologies, through casting and steelmaking, to rolling, forming and delivery of the product, including monitoring, quality assurance and environmental issues. The journal also carries research profiles, features on technological and industry developments and expert reviews on major conferences.
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