Interaction of rheology, geometry, and process in coating flow / Richard R. Eley in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 932 (09/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 932 (09/2002) . - p. 43-53 Titre : Interaction of rheology, geometry, and process in coating flow Type de document : texte imprimé Auteurs : Richard R. Eley, Auteur ; Leonard W. Schwartz, Auteur Année de publication : 2002 Article en page(s) : p. 43-53 Note générale : Bibliogr. Langues : Américain (ame) Tags : Modèle  mathématique  Simulation  numérique  Modélisation  Propriété  physique  Tension  superficielle  surface  Coulure  peinture  Défaut  Ecoulement  rhéologique  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A final coating of uniform thickness implies good leveling and the avoidance of defects during film formation. Though generally desired, this objective is often unmet. The outcome of a coating process depends on the nonlinear interaction of the rheology, process variables, and substrate geometry. Understanding the role of rheology is complicated by difficulties in linking fundamental rheological properties with coating performance. During a coating process, forces of varying type, magnitude and duration act on the fluid film. For non-Newtonian coatings the viscosity varies with both time and position within the coating layer, making predictions of flow behavior quite difficult. One answer is computer simulation, using numerical techniques to solve a set of nonlinear differential equations governing the flow. The rheological and other physical properties are parameter values for the program. We present results of mathematical modeling and numerical simulation ofa coating imperfection known as a dripmark. The model includes non-Newtonian rheology, substrate shape, surface tension, and gravity. We compare theoretical prediction with experimental observation in a study of two architectural paints. We also describe a new method of quantitatively measuring the surface profile of a coating defect. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5631 [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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