Study on Viscosity Resistance and Influence Factors of Sunken Roll System in Hot-Dip Galvanizing Unit
To address the issue of obtaining the viscous resistance of zinc liquid in the sunken roller system,this study first analyzes the mechanism and influencing factors of viscous resistance.By dividing the boundary layer based on the motion characteristics of the roller and strip steel,a new model for viscous resistance in the sunken roller system is proposed.Adjusting the roller insertion amount to manipulate the roller rotation state,the boundary layer viscous resistance is calculated in reverse.At last the model is applied to a galvanizing unit.The results show that the calculation error of each zone viscous resistance for different specifications strip steel in the zinc pot is within 15%,which meets the requirements of the unit.Furthermore,under actual working conditions,the effect of velocity difference between strip steel and zinc liquid on the viscosity resistance of zinc liquid presents a nonlinear increasing law under the actual working conditions of strip steel.The viscosity resistance of zinc liquid presents a nonlinear decreasing trend with the increase of zinc surface,but its fluctuation amplitude is different,while the viscosity resistance of zinc liquid presents a decreasing trend with the increase of temperature difference between strip steel and zinc liquid.
hot dip galvanizingstrip sectionnew viscous resistance modelboundary layer thicknessflow length on strip
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