International Scientific Journal

External Links


Air knives with very different nominal values are used for various purposes in the industry. The uses of air knives include the painting and coating stages of automobile semi-finished products, as well as many stages related to food production. One of the important sectors among these is the continuous hot-dip galvanizing process, which is a coating technique in the steel industry. In addition, the chemical coating process on paper as a very thin layer is another research topic. The most critical process needed in these sectors is to ensure a homogeneous air-flow at the expected air speed of the air-knife. These determine whether the coating on the steel or the chemical layer on the paper is homogeneous at the desired thickness. In this study, it is aimed that the air-knife can reach the expected values (speed and homogeneous distribution) with the expected tolerances, the shortest time, cost, and the least production process error. First, a design has been made so that this knife can blow air at the desired speed and homogeneously. For this, the most appropriate modeling and design values were created and analyzed with the CFD. The analysis and evaluations of the design were confirmed as a result of the measurements made on the prototype. This study shows that the inclusion of this type of modeling and analysis in the rapid product development process has an important role in minimizing cost and time.
PAPER REVISED: 2022-08-10
PAPER ACCEPTED: 2022-09-25
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Special issue 2, PAGES [727 - 734]
  1. So, H., Chung, M. K., Numerical Verification of the Performance of Double Jet Air-Knife System in Avoiding the Check-Mark Stain on the Zinc Coated Surface, ISIJ International, 51 (2011), 3, pp. 521-522
  2. Tamaddon, A. H., et al., Evaluation of High-Speed Linear Air-Knife Based Wafer Dryer, Solid State Phenomena, Trans. Tech Publications, 195 (2011), Dec., pp. 239-242
  3. Polanco, G., et al., CFD Design Tool for Industrial Applications, Proceedings, 6th LACCEI, Int. Latin American Caribbean Conf. Eng. Tech., Tequcigalpa, Honduras, (2008)
  4. So, H., et al., CFD Analysis of Sag Line Formation on the Zinc-coated Stell Strip after the Gas-jet Wiping in the Continuous Hot-dip Galvanizing Process, ISIJ International, 51 (2011), 1, pp. 115-123
  5. Soufiani, A. Y., et al., Numerical Investigation of Multiple-slot in Air-knife Wiping, J. Coat. Technol. Res., 14 (2017), 5, pp. 1015-1028
  6. Ahn, K. J., Chung, M. K., A Noble Gas Wiping System to Prevent the Edge Overcoating in Continuous Hot-dip Galvanizing, ISIJ International, 46 (2006), 4, pp. 573-578
  7. Tamadonfar, P., et al., Study of a Multi-slot Air-knife in the Wiping Process of Liquid Zinc Coatings, Proceedings, 8th Int. Conference of Zinc anad Zinc Alloy Coated Stell Sheet, Genova, Italy, 2011
  8. Lee, D. W., et al., A Study on the Air-knife Flow with Coanda Effect, J. Mechan. Sci. Tech., 21 (2007), 12, pp. 2214-2220
  9. Bao, C., et al., Numerical Simulation of the Effects of Air Knives on Coating Thickness, IFEESD, Proceedings, Int. Forum Energy, Envir. Sustain. Develop., Shenzhen, China, 2016, pp. 745-750
  10. Yoon, H. G., Chung, M. K., Development of Novel Air-knife System to prevent Check-mark Stain on Galvanized Strip Surface, ISIJ International, 50 (2010), 5, pp. 752-759
  11. Sumitomo, Y., Kakuno, H., NSbladeTM Application of Advanced Air-knife to Hot Dip Continuous Galvanizing Line -Improvment of Operational Stability at High Speed Production-Nipponsteel & Sumikin Engineering, Technical Report, 9, (2018)
  12. Chen, J. Q., et al., Simulation Analysis on Inner Flow Field and Optimization design of Air-knife, JVE J. Vibroengineering, 19 (2017), 8, pp. 6374-6389
  13. Menter, F. R., Two Equation Eddy-Viskosity Turbulence models for Engineering Applications, AJAA. J., 32 (1994), 8, pp. 1598-1605
  14. Menter, F. R., Spectral Eddy-Viscosity Transport Equation and their Relation to the k-ε Model, NASA-TM-108854, (1994b)
  15. Hellsten, A., Ome Improvements in Menter's k-ω SST Turbulence Model, Proceedings, 29th AIAA Fluid Dynamics Conference, Albuquerque, N. Mex., USA, (1997)
  16. Tu, L., et al., Computational Fluid Dynamics, Elsevier, Amsterdam, The Netherlands, 2018

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence