Numerical modeling of gas-jet wiping process

Myrillas, Konstantinos; Rambaud, Patrick; Mataigne, Jean-Michel; Gardin, Pascal; Vincent, Stéphane; Buchlin, Jean‐Marie

doi:10.1016/j.cep.2012.10.004

Cited by 16 publications

(21 citation statements)

References 14 publications

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“…Using an LES model approach entails high computational costs. Myrillas et al could demonstrate the applicability of LES in 2D for an experimental gas‐jet wiping process . Also in the present paper the LES turbulence model was applied in 2D concentrating on the coating surface profile in rolling direction.…”

Section: Introductionmentioning

confidence: 73%

“…Lacanette et al combined the LES turbulence model together with the VOF multiphase method for immiscible fluids, in order to track and investigate the gaseous‐liquid interphase . Myrillas et al also focused on this gaseous‐liquid interaction . They numerically predicted the thickness of wiped‐off glycerin by an air jet with Reynolds number of 1840, which was validated with an experimental light absorption technique.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Gas‐Jet Wiping Process − Two‐Phase Large Eddy Simulations Elucidate Impingement Dynamics and Wave Formation on Zinc Coatings

Pfeiler

Eßl

Reiss

et al. 2017

steel research int.

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In addition to corrosion resistance and processing properties, high coating uniformity is a key quality criterion for galvanized steel sheets. Hydrodynamic gas jet wiping has proved to be an efficient method to control the coating thickness. However, the occurrence of nonuniformities is attributed to the unsteadiness of the impinging jet. For the first time, vertical surface non-uniformities resulting from the interaction of the impinging jet with the liquid coating are numerically predicted under industrial boundary conditions using the ANSYS Fluent 1 . The turbulent flow field of the compressible wiping gas is accomplished by the LES (Large-Eddy-Simulation) turbulence model, whereas the interphase between the wiping gas and the liquid coating is modeled by the VOF (Volume-of-Fluid) method. It is found that the liquid coating reacts relatively slowly to the high frequent flapping gas jet. Only, when the jet is deflected for a comparatively long period, significant waves are able to develop. The waviness predicted by the simulation model is in good agreement with experimental results. Thus, the model enables a careful study of process settings on the vertical coating uniformity characteristics. For the studied case, an increase of nozzle inclination is found to enhance the performance in terms of coating uniformity significantly.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Investigation of the Gas‐Jet Wiping Process − Two‐Phase Large Eddy Simulations Elucidate Impingement Dynamics and Wave Formation on Zinc Coatings

Pfeiler

Eßl

Reiss

et al. 2017

steel research int.

View full text Add to dashboard Cite

show abstract

“…In the galvanization of steel, for example, so-called jet stripping is a common technique [1][2][3][4][5][6][7][8], where the thickness and uniformity of a metallic coating on a moving sheet of steel is adjusted by the pressure and shear stress of an impinging slot jet. The analogous effect is also relevant in smaller scale systems, such as ultrathin films of hard disk lubricant [9].…”

Section: Introductionmentioning

confidence: 99%

Deformation and dewetting of thin liquid films induced by moving gas jets

Berendsen

Zeegers

Darhuber

2013

Journal of Colloid and Interface Science

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“…It is envisaged that fluctuation of this wall pressure and wall shear stress cause variation in coating thickness. Recent studies [6][7][8][9][10] have shown the ripples on the coating surface are correlated to the fluctuating impinging pressure and shear stress which in turn is a consequence of the jet oscillation. Numerical studies of air-coating liquid interaction showed that jet oscillation is reflected on the final coating thickness 9,10) with the low frequency components of the impingement wall pressure fluctuation correlated to the waviness of the coating surface.…”

Section: Introductionmentioning

confidence: 99%

Vortex Dynamics and Fluctuations of Impinging Planar Jet

et al. 2020

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Smoothness of thin metallic coated strip produced in continuous galvanizing lines is influenced by fluctuations of the impinging wiping pressure. In this paper, vortex dynamics e.g. vortex production frequency and mixing of jet opposing shear layer vortices; and impinging pressure were numerically studied by Large Eddy Simulation (LES). The effects of jet nozzle width, d, and operational parameters (nozzle to strip distance, H, and mean jet velocity, U o) were investigated. Vortex production rate is almost linearly correlated to U o and mixing of shear layer vortices occurs when H/d ≥ 6. Dominant frequencies of impinging pressure fluctuation are significantly different between the two possible phenomena of i) Mixing of opposing shear layer vortices prior to jet impingement on the strip, or ii) No mixing of opposing shear layer vortices prior to jet impingement. The impinging pressure of a jet characterised by mixing of vortices is predominantly composed of frequencies lower than 10 kHz with the most significant components at less than 1 kHz. In contrast, for a jet with non-mixing of vortices, the impinging pressure fluctuations are comprised of frequencies greater than 10 kHz and the dominant frequency is approximately one half the vortex production frequency. Utilising existing model results for the coating thickness response to pressure and shear stress fluctuations 12) the anticipated degree of coating thickness sensitivity to the mixing and nonmixing impinging jet cases of the present work has been elucidated. It is shown that a mixed vortices jet is most likely to cause surface ripples in the coating.

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Numerical modeling of gas-jet wiping process

Cited by 16 publications

References 14 publications

Investigation of the Gas‐Jet Wiping Process − Two‐Phase Large Eddy Simulations Elucidate Impingement Dynamics and Wave Formation on Zinc Coatings

Investigation of the Gas‐Jet Wiping Process − Two‐Phase Large Eddy Simulations Elucidate Impingement Dynamics and Wave Formation on Zinc Coatings

Deformation and dewetting of thin liquid films induced by moving gas jets

Vortex Dynamics and Fluctuations of Impinging Planar Jet

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