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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Operability limits for non-Newtonian liquids in dual-layer slot coating processes using the viscocapillary model / Jin Seok Park in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. pages 35-47 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 [article]

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