This paper presents an analysis of the jet wiping process in hot-dip galvanization. This technique consists in reducing the liquid film thickness on a moving substrate by applying gas slot jets. A theoretical development allows the computation of the film thickness distribution in the wiping zone. It is further simplified to an engineering model which predicts the final coating thickness, in good agreement with wiping experiments, as well as numerical simulations. The limit of applicability of jet wiping is due to the occurence of a violent film instability, called splashing, which takes the form of a liquid droplet emission just below the nozzle. An experimental investigation of this phenomenon is conducted on a water model facility. Two nozzle designs are tested. The effect of the process parameters such as the strip speed, the nozzle pressure, the standoff distance and the tilt angle of the nozzle on splashing is emphasized. A dimensionless correlation is established to allow the prediction of the operating conditions leading to splashing occurence. It is confronted to observations made on galvanization lines.
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ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering
July 17–20, 2006
Miami, Florida, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4750-0
PROCEEDINGS PAPER
Hot-Dip Galvanization and Jet Wiping Technique
Anne Gosset,
Anne Gosset
von Karman Institute for Fluid Dynamics, Rhode-St-Gene`se, Belgium
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Jean-Marie Buchlin
Jean-Marie Buchlin
von Karman Institute for Fluid Dynamics, Rhode-St-Gene`se, Belgium
Search for other works by this author on:
Anne Gosset
von Karman Institute for Fluid Dynamics, Rhode-St-Gene`se, Belgium
Jean-Marie Buchlin
von Karman Institute for Fluid Dynamics, Rhode-St-Gene`se, Belgium
Paper No:
FEDSM2006-98331, pp. 1467-1477; 11 pages
Published Online:
September 5, 2008
Citation
Gosset, A, & Buchlin, J. "Hot-Dip Galvanization and Jet Wiping Technique." Proceedings of the ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. Volume 1: Symposia, Parts A and B. Miami, Florida, USA. July 17–20, 2006. pp. 1467-1477. ASME. https://doi.org/10.1115/FEDSM2006-98331
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