| Titre : |
Operability limits for non-Newtonian liquids in dual-layer slot coating processes using the viscocapillary model |
| Type de document : |
texte imprimé |
| Auteurs : |
Jin Seok Park, Auteur ; Taehyung Yoo, Auteur ; Kwan-Young Lee, Auteur ; Hyun Wook Jung, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. pages 35-47 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cisaillement (mécanique)
Enduction par filière
Enrobage (technologie)
Fluides non newtoniens
Revêtements
Rhéologie
|
| Tags : |
'Revêtement de fente à double couche' Cisaillement 'Modèle viscocapillaire' 'Invasion mi-chemin' 'Limites d'opérabilité' |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The operability windows and coating bead dynamics for the dual-layer slot coating process with non-Newtonian coating liquids were investigated using the viscocapillary model, a two-dimensional (2D) CFD simulation, and experiments. The simplified viscocapillary model derived from the 2D equation of motion with the shear-thinning Carreau liquids bounds the uniform coating regime without defects such as leaking, bead break-up, and mid-gap invasion in dual-layer coating systems. The coating bead flows from experiments and finite-volume-based 2D simulations with the volume-of-fluid scheme demonstrate the performance of the viscocapillary model in reliably tracking the upstream meniscus position of the bottom layer in the coating bead region. The onset of leaking, bead break-up, and mid-gap invasion defects is strongly affected by the rheological properties of Carreau-type coating liquids and the flow ratio between the top and bottom layers. In particular, the relative thickness of the shear-thinning bottom layer at the onset of mid-gap invasion is smaller than the well-known 1/3 value in the Newtonian case, depending on the degree of shear thinning. |
| Note de contenu : |
- Viscocapillary model for non-Newtonian dual-slot coating flow
- Experimental methods
- CFD simulations
- Results and discussion : Comparison of operability limits and coating bead dynamics - Effect of the flow ratio on the operability limits - Effect of rheological properties of coating liquids in the model |
| DOI : |
https://doi.org/10.1007/s11998-021-00499-5 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-021-00499-5.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37143 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. pages 35-47
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