Application of the network simulation method to flat dies with inverted prelands / Thomas Köpplmayr in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 322-330 Titre : Application of the network simulation method to flat dies with inverted prelands Type de document : texte imprimé Auteurs : Thomas Köpplmayr, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2013 Article en page(s) : p. 322-330 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algèbre Analyse mathématique Ecoulement tridimensionnel Ecoulement visqueux Etat fondu (matériaux) Fluide de Carreau Le fluide de carreau est un type de fluide newtonien généralisé où la viscosité, dépend du taux de cisaillement. Fluides, Mécanique des Polymères Simulation, Méthode de Index. décimale : 668.4 Plastiques, vinyles Résumé : We present a systematic approach based on Kirchhoff’s laws that uses tensor algebra and analytical formulae obtained from constitutive equations for the analysis of flow resistance networks. The flow of a Carreau fluid in a flat die with inverted preland is analyzed in terms of mass flow, velocity, and residence time distributions. Viscous heating is taken into account by using an analytical model which depends on the Cameron number of the flow at different positions. Further, we report the results of a three-dimensional simulation, using the commercially available ANSYS Polyflow software, which are in good agreement with our numerical study. Note de contenu : - MODELING FRAMEWORK : Implementation of carreau model - Network analysis - Numerical determination of flow coefficients - Viscous dissipation - SIMULATION DOI : 10.3139/217.2758 En ligne : https://drive.google.com/file/d/1EabP6OgqMVCfCO3seu19wDS6XUf2gwnt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19022 [article]

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Numerical simulation of the dip-coating process with wall effects on the coating film thickness / Mahyar Javidi 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. 843-853 Titre : Numerical simulation of the dip-coating process with wall effects on the coating film thickness Type de document : texte imprimé Auteurs : Mahyar Javidi, Auteur ; Andrew N. Hrymak, Auteur Année de publication : 2015 Article en page(s) : p. 843-853 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Dip-coating Fluide de Carreau Le fluide de carreau est un type de fluide newtonien généralisé où la viscosité, dépend du taux de cisaillement. Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : The dip-coating process for liquid film deposition on cylindrical substrates is numerically simulated, and the effects of the coating bath walls proximity to the substrate are investigated for the deposited film thickness. In the present work, the hydrodynamics of non-Newtonian liquid films are studied, applying Carreau and power law models. The free surface position is determined by the volume of fluid technique in a three-dimensional system, while the impacts of density, viscosity, and surface tension are taken into account. The momentum and mass balance, alongside the constitutive equations, were solved for dip-coating process using numerical simulations in an open source CFD software package of OpenFOAM. Numerical outcomes are validated with experimental data over a large range of withdrawal velocities up to 6 m/s. Also good agreement is obtained for numerical simulation results with experimental data for coating thickness, considering the proximity effects of bath walls to the cylindrical substrate being withdrawn from a coating bath. Note de contenu : - THEORETICAL PROCEDURE : Mathematical formulation - Free surface implementation - Constitutive equations - NUMERICAL PROCEDURE : Grid generation - Boundary conditions - RESULTS AND DISCUSSION : Validation of simulation results with previous experimental data - Wall effects DOI : 10.1007/s11998-015-9699-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9699-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24683 [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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