Research on airflow characteristic of the strip edge in hot-dip galvanizing process

To explore the strip edge pressure decreases as gas-jet wiping in hot-dip galvanizing process,a gas impact plate experiment was carried out,and the process of gas jet wiping was also simulated using the measured results. The added edge baffle near the edge of strip which is used to prevent the wall pressure decreases in strip edge was optimized with the help of the analytic model of film thickness. The results show that the airflow of strip edge occurs lateral deflection and the wall pressure in the strip edge is lower than those in center,in addition,the edge air pressure attenuation increases with the rising distance between the air knife and the strip. The edge pressure decreases and the edge over coating problem can be reduced effectively by adding edge baffle,and the best result happens when the thickness of baffle is 2 mm.