| Download | - View accepted manuscript: Numerical investigation of dross formation and minimization in continuous galvanizing baths (PDF, 461 KiB)
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| Author | Search for: Ajersch, Frank; Search for: Ilinca, Florin1; Search for: Goodwin, Frank E. |
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| Affiliation | - National Research Council of Canada. NRC Industrial Materials Institute
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| Format | Text, Article |
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| Conference | 8th International Conference on Zinc and Zinc Alloy Coated Steel Sheet, GALVATECH 2011, June 21-24, 2011, Genova, Italy |
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| Subject | Continuous galvanizing; dross formation; oxidation; dross minimization; numerical simulation; bench scale experiment |
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| Abstract | This contribution presents numerical investigations into some aspects affecting the formation of dross during continuous galvanizing. It is well known that dross formation depends on the bath composition, temperature and flow dynamics. However, experimental observation indicates that top dross formation is affected by oxidation at the surface of the bath as the use of an inert gas in air knifes greatly reduces dross generation. In this work numerical simulations are used to investigate the flow dynamics of the gas in the vicinity of the bath surface in order to obtain correlations between the gas velocity and the propensity for oxidation and dross formation. Simulations are first shown for a bench scale experiment simulating top dross formation for which experimental data are available. The experiment consists of a crucible containing liquid zinc with various aluminum and iron contents. The flow in the crucible is generated by the rotation of a propeller immersed into the liquid zinc and then air or inert gas is projected to the surface of the liquid metal to determine the effect on oxidation and dross formation. Dross formation is then correlated to the size of the exposed surface and to the relative velocity between the liquid zinc and the gas. Numerical results are also shown for the gas flow dynamics inside air knifes and in the vicinity of the bath surface. This provides a map of the relative gas/liquid velocity at bath surface which then can be used to estimate the propensity for oxidation and top dross formation. |
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| Publication date | 2011-06-21 |
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| In | |
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| Language | English |
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| Peer reviewed | No |
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| NRC number | NRCC 54269 |
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| NPARC number | 18371422 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 9a377019-7b4f-439e-b4cd-c2093799da9f |
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| Record created | 2011-08-03 |
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| Record modified | 2020-07-14 |
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