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Influence of the atomization gas in coating processes / Oliver Tiedje in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 8, N° 1 (2015)
[article]
Titre : Influence of the atomization gas in coating processes Type de document : texte imprimé Auteurs : Oliver Tiedje, Auteur ; Qiaoyan Ye, Auteur ; Bo Shen, Auteur Année de publication : 2015 Article en page(s) : p. 6-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Atomisation
Revêtements:Peinture
Simulation, Méthode de
Système de pulvérisation (technologie)Index. décimale : 667.9 Revêtements et enduits Résumé : Atomization plays a crucial role in spray coating processes. The liquid paint is broken up to small droplets and accelerated to the work piece. A conflict of goals is appearing here : a high quality of the layer requires usually a fine atomization, but small droplets can lead to enhanced overspray. Discussions regarding the use of other atomization gases than air shall be focused to a systematic base in this article. Note de contenu : - Goal of a perfect atomization
- Methods for simulation and measurementPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23720
in INTERNATIONAL SURFACE TECHNOLOGY (IST) > Vol. 8, N° 1 (2015) . - p. 6-8[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17113 - Périodique Bibliothèque principale Documentaires Disponible Initial droplet conditions in numerical spray painting by electrostatic rotary bell sprayers / Nico Guettler in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 5 (09/2020)
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Titre : Initial droplet conditions in numerical spray painting by electrostatic rotary bell sprayers Type de document : texte imprimé Auteurs : Nico Guettler, Auteur ; Philipp Knee, Auteur ; Qiaoyan Ye, Auteur ; Oliver Tiedje, Auteur Année de publication : 2020 Article en page(s) : p. 1091–1104 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atomiseurs
Evaluation
Fluides, Dynamique des
Peinture au pistolet
Pulvérisation électrostatique
Revêtements:Peinture
Simulation par ordinateurIndex. décimale : 667.9 Revêtements et enduits Résumé : In computational fluid dynamics, the modeling of paint application processes by electrostatic rotary bell sprayer is mostly performed using an Euler–Lagrange approach. The initial conditions of the discrete phase—position, velocity, size, and charge—have an essential influence on the resulting film thickness distribution and the total charge transferred to the object. Typically, so-called injection models are used to specify these initial conditions, whereby the determination of the injection model coefficients is crucial. In this paper, a framework is proposed that combines experimental input data, an injection model, and a metamodel-based optimization. The painting tests for the generation of input and validation data were carried out in a technical center in the industrial standard. The simulations were performed using ANSYSFluent. Initial droplet conditions could efficiently be determined via the framework so that the painting-specific objectives were achieved with reasonable accuracy. In addition to the framework, a turbulence study of the strongly swirled shaping air of this atomizer was carried out, whereby a substantial underestimation of the axial air velocity was found in the turbulence models being investigated. The initial droplet conditions were also used in this study to draw conclusions about the accuracy of the airflow simulation. The proposed framework can be adapted to other solvers and efficiently finds injection model coefficients for other paint applicators. Note de contenu : - STRUCTURE AND OBJECTIVE OF THE FRAMEWORK
- EXPERIMENTAL MATERIALS AND METHODS : Spray booth, atomizer, and paint material - Determination of shaping air velocity - Determination of particle size distribution - Determination of painting-specific data
- NUMERICAL METHODS : Domain, grid and boundary settings - Turbulence model and solver settingst - Discrete phase model : motion of particles
- SIMULATION OF THE AIRFLOW FIELD
- MODELING INITIAL DROPLET CONDITIONS : Injection model : droplet position - Injection model : droplet velocity - Injection model : droplet size distribution - Injection : droplet charge
- METAMODEL-BASED OPTIMIZATION OF INJECTION MODEL COEFFICIENTS : Design of experiments : sampling points - Conduction and evaluation of simulations - Principle component analysis - Training of metamodels - Multiobjective optimizationDOI : https://doi.org/10.1007/s11998-020-00352-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00352-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34552
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 5 (09/2020) . - p. 1091–1104[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22303 - Périodique Bibliothèque principale Documentaires Disponible Primary breakup of a non-Newtonian liquid using a high-speed rotary bell atomizer for spray-painting processes / Bo Shen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
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Titre : Primary breakup of a non-Newtonian liquid using a high-speed rotary bell atomizer for spray-painting processes Type de document : texte imprimé Auteurs : Bo Shen, Auteur ; Qiaoyan Ye, Auteur ; Nico Guettler, Auteur ; Oliver Tiedje, Auteur ; Joachim Domnick, Auteur Année de publication : 2019 Article en page(s) : p. 1581-1596 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atomiseurs
Dépôt par pulvérisation
Fluides non newtoniens
Formation de film
Revêtements:Peinture
Rhéologie
Simulation par ordinateur
Système de pulvérisation (technologie)Index. décimale : 667.9 Revêtements et enduits Résumé : The present contribution deals with numerical and experimental studies of the primary liquid breakup process using a high-speed rotary bell atomizer. The first part of the investigations focuses on the film formation on the distributor disk and the inner surface of the rotary bell. Numerical simulations using the volume-of-fluid approach were carried out. A non-Newtonian liquid that has shear-thinning behavior is used to investigate the effect of the viscosity on the initial wetting, the film formation process, and the film thickness distribution on the bell. A nonhomogeneous film structure is found on the inner surface of the rotary bell. This is also observed in experimental investigations using a high-speed camera. The second part focuses on the disintegration process of the paint liquid in the near bell region. As inlet conditions for the breakup simulations, the properties of the liquid film at the bell edge, i.e., film thickness, velocities, and apparent viscosity, resulting from the film formation simulations were applied. Two different liquid disintegrations in the near-field were found, which were also observed in experimental investigations using a high-speed camera. Furthermore, user-defined functions were compiled in ANSYS Fluent to uniquely identify and characterize droplets formed through the breakup process. In this way, droplet properties such as diameter, velocity, and position can be determined. Note de contenu : - CHARACTERISTICS OF THE ATOMIZER : Experimental setup and measuring techniques
- NUMERICAL METHODS
- SIMULATION OF THE FILM FORMATION ON THE BELL : Computational domain - Wetting process on the bell - Simulation of air flow in the near bell region - Computational domain - Boundary conditions - Atomization regimes - Drop detectionDOI : 10.1007/s11998-019-00231-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00231-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33411
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1581-1596[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21321 - Périodique Bibliothèque principale Documentaires Disponible Simulations and experimental investigation of paint film leveling / Fabian Seeler in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 4 (07/2017)
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Titre : Simulations and experimental investigation of paint film leveling Type de document : texte imprimé Auteurs : Fabian Seeler, Auteur ; Christian Hager, Auteur ; Oliver Tiedje, Auteur ; Matthias Schneider, Auteur Année de publication : 2017 Article en page(s) : p. 767-781 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Revêtements:Peinture
Simulation par ordinateur
Surfaces (Physique)
Thixotropie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : The surface structure of a paint film is the result of the interplay of a variety of physical influences, e.g., the superposition of droplets during spray application, the surface tension-driven leveling, and the viscosity increase in the leveling phase. A numerical simulation program is presented that incorporates all the relevant mechanisms of paint film structure formation during and after spray application. The simulation program was validated by comparing simulations and leveling experiments. The influence of the initial film geometry and viscosity on the leveling behavior is demonstrated. For the investigations, model liquids and commercial paints with an increasing complexity of the physical properties were chosen: Newtonian flow behavior without solvent evaporation, Newtonian flow behavior with solvent evaporation, viscoelastic paints with non-Newtonian flow behavior. Four variants are proposed regarding how thixotropy can be measured and how a mathematical model can be created. The advantages and disadvantages of the variants with regard to the implementation of thixotropy in the simulations are listed. A method to predict the leveling behavior of thixotropic paints with simultaneous recovery of the viscous and elastic properties from rheological measurements using discrete relaxation time spectra is presented. Note de contenu : - STATE OF RESEARCH
- EXPERIMENTAL AND COMPUTATIONAL PROCEDURE : Simulation program - Physical models - Measurement methods
- RESULTS AND DISCUSSION : Initial film geometry - Newtonian model liquids without solvent evaporation - Newtonian paint with solvent evaporation - Non-newtonian paints with thixotropic and viscoelastic behavior - Leveling of an irregular 3D topographyDOI : 10.1007/s11998-017-9934-s En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9934-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28919
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 4 (07/2017) . - p. 767-781[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19194 - Périodique Bibliothèque principale Documentaires Disponible