Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models / Si Hyung Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 47-55 Titre : Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models Type de document : texte imprimé Auteurs : Si Hyung Lee, Auteur ; See Jo Kim, Auteur ; Jaewook Nam, Auteur ; Hyun Wook Jung, Auteur ; Jae Chun Hyun, Auteur Année de publication : 2014 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière Revêtements Tags : 'Buse  à  lèvres'  'Vortex  en  amont'  aval'  'Fenêtre  inclinée'  'Modèle  de  Navier-Stokes'  Visco-capillaire'  Revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : As an indicator for determining the operability window in slot coating flow, the viscocapillary model considering various configurations of upstream and downstream slot die lips was tested and compared with Navier–Stokes two-dimensional model. Bead pressure and sloped lip angle conditions for uniform coating operation demarcated from leaking and bead break-up defects were quantitatively predicted from the position of upstream meniscus from both models. By comparing the results, it is confirmed that the viscocapillary model for many kinds of sloped die lips could predict the operability window accurately. It is also found that there exists vortex or recirculation regimes inside upstream and downstream coating bead regions, depending on the angles of sloped die lips, even for the stable coating flow. The flow control by die lip structure will be usefully applied to design the strategy for the reliable and optimal coating process, including vortex-free windows. Note de contenu : - GOVERNING EQUATIONS FOR COATING BEAD FLOW : Viscocapillary model considering the sloped die configuration - Calculation of 2-D coating bead flow DOI : 10.1007/s11998-013-9504-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9504-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20615 [article]

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Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows / Won-Gi Ahn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1067-1076 Titre : Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows Type de document : texte imprimé Auteurs : Won-Gi Ahn, Auteur ; Si Hyung Lee, Auteur ; Jaewook Nam ; See Jo Kim ; Kwan-Young Lee ; Hyun Wook Jung Année de publication : 2018 Article en page(s) : p. 1067-1076 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Enduction par filière Fluides newtoniens Mouillage (chimie des surfaces) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids. Note de contenu : - EXPERIMENTAL SETUP : Properties of coating liquids - NUMERICAL SIMULATIONS FOR COATING BEAD FLOWS - RESULTS AND DISCUSSION : Operability windows by models and experiments - Observation of upstream meniscus shape - Comparison of coating bead flows from experiments and 2-D simulations - Effect of contact angles at upstream meniscus on coating bead dynamics - Effect of contact angles at upstream meniscus on operability window DOI : 10.1007/s11998-018-0059-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0059-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31133 [article]

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