Parametric Study of Wall Shear Stress Developed by an Impinging Planar Jet for Coating Weight Models used in Continuous Hot-dip Galvanizing

Wall shear stress was experimentally measured under a planar impinging air jet as a function of jet Reynolds number (Rejet = 5000, 8000, 11000) and normalized impingement distances (Z/D = 4, 6, 8, 10, 12) to complete a parametric study. The wall pressure, wall pressure gradient, and wall shear stress information was obtained for use in analytical film coating models for an air-knife assembly applicable to continuous hot-dip galvanizing.