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)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 5 (09/2020) . - p. 1091–1104 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 ordinateur Index. 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 optimization DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34552 [article]

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