Abstract
In hot-dip galvanizing lines, undesirable vibration of the moving steel strip occurs due to the impingement of the high-speed turbulence jet, which leads to non-uniformity of zinc thickness, as well as splash of the liquid zinc. In this paper, the turbulent jet flow field is firstly numerically obtained using the CFD method. Then, the influence of the turbulent jet flow on the steel strip is simplified as a harmonic force at the impingement line, and the response of the steel strip is obtained by means of finite element analysis for different strip lengths, thickness and pretension forces. Influences of impingement distance, air knife slot gap and jet pressure, on vibration of the steel strip are also analyzed. The results will provide theoretical basis for the reduction of steel strip vibration in continuous hot-dip galvanizing process.
Highlights
In the hot-dip galvanized process, the high-speed gas jet impinges on the moving steel strip coated with liquid zinc, and leads to the formation of a runback flow of the liquid zinc down to the bath, to control the coating thickness
The influence of the turbulent jet flow on the steel strip is simplified as a harmonic line force, whose period can be obtained from Figure 4
Vibration of the steel strip in the continuous hot-dip galvanization process can be attributed to the turbulent fluctuation of the jet flow field
Summary
In the hot-dip galvanized process, the high-speed gas jet impinges on the moving steel strip coated with liquid zinc, and leads to the formation of a runback flow of the liquid zinc down to the bath, to control the coating thickness. In continuous hot-dip galvanization lines, vibration of the moving steel strip has been observed [1], which results in reduced coating quality, such as zinc ripple. Albeit the above work on the vibration of steel strips in the continuous hot-dip galvanization process, little work has been done on the mechanism of this vibration, as well as its characteristics and influencing parameters. Mechanism of the vibration of steel strips in the galvanization process is revealed and its characteristics are analyzed. Air knife slot gap and jet pressure on vibration of the steel strip are investigated
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