Numerical Verification of the Performance of Double Jet Air-knife System in Avoiding the Check-mark Stain on the Zinc Coated Surface

摘要

3. Conclusion In order to numerically verify the performance of the novel double jet air-knife system, proposed in previous paper, to avoid the check-mark stain on the zinc coated surface, the figuration of the zinc coated surface produced by employing the double jet air-knife system has been numerically simulated, and it has been compared with that produced by the single jet air-knife system currently in use at a zinc coating plant. In order to predict the coating film surface, necessary numerical data such as static pressure, pressure gradient and wall shear stress distributions were obtained by using the commercial code, FLUENT. LES technique was used to simulate the three dimensional unsteady compressible turbulent flow field around the air-knife system.