Response of slot coating flow to gap disturbances : effects of fluid properties, operating conditions, and die configurations / Semi Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 949-958 Titre : Response of slot coating flow to gap disturbances : effects of fluid properties, operating conditions, and die configurations Type de document : texte imprimé Auteurs : Semi Lee, Auteur ; Jaewook Nam, Auteur Année de publication : 2015 Article en page(s) : p. 949-958 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Slot  coating'  'Frequency  response'  'Finite  element  method'  Uniformity  'Gap  disturbance' Index. décimale : 667.9 Revêtements et enduits Résumé : Slot coating is perhaps one of the most successful film manufacturing methods and is used to produce a wide variety of products. It is a pre-metered method and ideal for high-precision coating: the steady-state thickness is precisely controlled by the flow rate fed to the die and the web speed. However, the coating method is surrounded by small-scale disturbances that can destroy film thickness uniformity. Among various disturbances, a periodic change of the coating gap, the so-called gap disturbance, is considered the most dangerous in previous studies, e.g., Romero and Carvalho (Chem Eng Sci 63(8):2161–2173, 2008), Tsuda et al. (AIChE J 56(9):2268–2279, 2010), and Lee and Nam (AIChE J, 2015). However, the effects of fluid properties, operating conditions, and die configurations on the slot coating flow under gap disturbances are not examined in detail. In this study, we revisit the computer-aided analysis of transient slot coating flow designed to predict the thickness variations under gap disturbance. Extensive computational predictions reveal important parameters for suppressing film nonuniformity that can be induced by gap disturbance. Note de contenu : - GOVERNING EQUATIONS AND BOUNDARY CONDITIONS - SOLUTION METHODS - RESULTS AND DISCUSSION : Effects of fluid properties - Effects of operating conditions - Effect of die configurations DOI : 10.1007/s11998-015-9684-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9684-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24697 [article]

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Transient response of slot coating flows of shear-thinning fluids to periodic disturbances / Semi Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 981-990 Titre : Transient response of slot coating flows of shear-thinning fluids to periodic disturbances Type de document : texte imprimé Auteurs : Semi Lee, Auteur ; Jaewook Nam, Auteur Année de publication : 2017 Article en page(s) : p. 981-990 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique) Enduction par filière Fluide de Carreau Le fluide de carreau est un type de fluide newtonien généralisé où la viscosité, dépend du taux de cisaillement. Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Slot coating is a popular coating method, in which the film thickness is precisely controlled by adjusting the flow rate and production speed. When the coating flow undergoes small-scale disturbances generated by rotating elements such as motors, pumps, or uneven rolls, the downstream meniscus fluctuates, which causes film thickness variation in the flow direction. Although most coating liquids including polymeric and particulate solutions exhibit a shear-thinning rheological property, their effect on transient coating flow behaviors is not deeply understood. Here, the effect of shear-thinning property on film thickness variation under different disturbances is investigated using a computer-aided analysis of transient slot coating flow. In this study, the Carreau model is used to describe the shear-thinning property, and four different disturbances are considered. Note de contenu : - Governing equations and boundary conditions - Material properties and operating conditions - Results and discussion : Disturbance strongly sensitive to the shear-thinning property : the coating gap - Disturbance weakly sensitive to the shear-thinning property - Final remarks - Appendix : Development of the parabolic velocity profile for carreau fluids - Dependence of film thickness variation on the upstream bead size under vacuum disturbance DOI : 10.1007/s11998-017-9952-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9952-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29127 [article]

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