Leveling of a model paint film with ayield stress / D. E. Weidner in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 4 (07/2020) . - p. 851-863 Titre : Leveling of a model paint film with ayield stress Type de document : texte imprimé Auteurs : D. E. Weidner, Auteur Année de publication : 2020 Article en page(s) : p. 851-863 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Elasticité Modèles numériques Revêtements:Peinture Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : The coating dynamics of a drying paint film with a yield stress is studied. The liquid is modeled as a binary mixture with one volatile component, solvent, and one nonvolatile component, resin. When the solvent has a different surface tension than the resin, solvent evaporation can lead to the creation of surface tension gradients which can potentially overcome the yield stress and dramatically affect the flow history. Using the lubrication approximations to derive the flux of the liquid film parallel to the substrate, we find that the presence of the yield stress causes several distinct flow regimes. The total flux of each of these regimes is summed, and using the continuity equation we derive an evolution equation giving the height of the free surface as a function of the distance along the substrate and time. The resulting equations are discretized and solved numerically using finite differences. High order derivative is treated implicitly, allowing for large time steps and reducing the computational requirements. We find that the presence of a yield stress greatly affects the leveling behavior of the coating. Critical yield stresses exist that can cause maximal leveling of the coating film. Note de contenu : - Derivation of equations - Nondimensionalization - Numerical aspects DOI : https://doi.org/10.1007/s11998-019-00260-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00260-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34375 [article]

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Numerical modeling of the spray coating of spinning bodies / D. E. Weidner in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 363-376 Titre : Numerical modeling of the spray coating of spinning bodies Type de document : texte imprimé Auteurs : D. E. Weidner, Auteur ; Leonard W. Schwartz, Auteur ; Richard R. Eley, Auteur Année de publication : 2019 Article en page(s) : p. 363-376 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt par pulvérisation Modèles numériques Revêtement par centrifugation Index. décimale : 667.9 Revêtements et enduits Résumé : We derive the lubrication form of the fluid mechanical equations governing the motion of a thin liquid film on an arbitrarily curved, rotating, axisymmetric substrate. The resulting equations are discretized and then solved numerically using an efficient implicit finite difference algorithm. Non-Newtonian effects are included by incorporating an Ellis viscosity model. The primary application for this work is to model the spin coating of the interior of two-piece metal beverage cans, and we consider this problem in some depth. Specifically, we show how adjusting several parameters can eliminate one possible defect in the spin coating process: the tendency for droplets to detach from the substrate when the can is spun at high rotation rates. Note de contenu : - Previous work - Derivation of equations - Nondimensionalization - Numerical aspects - Applications - Conclusion - Appendix 1 : Application of coating layer - Appentix 2 : Calculating the height of a pendant drop of maximum volume DOI : 10.1007/s11998-018-0131-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0131-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32410 [article]

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