Analysis of droplet impingement of different atomizers used in spray coating processes / Qiaoyan Ye in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 467–476 Titre : Analysis of droplet impingement of different atomizers used in spray coating processes Type de document : texte imprimé Auteurs : Qiaoyan Ye, Auteur ; Joachim Domnick, Auteur Année de publication : 2017 Article en page(s) : p. 467–476 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse numérique Dépôt par pulvérisation Revêtements:Peinture Système de pulvérisation (technologie) Taille des gouttelettes Index. décimale : 667.9 Revêtements et enduits Résumé : This paper presents numerical studies on spray painting processes using three different atomizers, i.e., a high-speed rotary bell atomizer, an airless gun and a pneumatic air spray gun. A commercial CFD code was applied using an Euler-Lagrangian approach for two phase flow calculations. Special attention was paid to the droplet impingement process on the substrate. Orthogonal impact velocities and size distributions of the droplets depositing on substrates were analyzed in detail. The obtained simulation results show substantial differences of the impacting droplet characteristics of these three atomizers, which will have significant influences on the properties of the forming paint films. Note de contenu : - Droplet impingement using a high-speed rotary bell atomizer - Droplet impingement using an airless gun - Droplet impingement using a pneumatic atomizer DOI : 10.1007/s11998-016-9867-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9867-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28161 [article]

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Check before you cure / Joachim Domnick in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2015)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2015) . - p. 124-127 Titre : Check before you cure : Students evaluate a gauge for measuring uncured powder coating thickness Type de document : texte imprimé Auteurs : Joachim Domnick, Auteur ; Denise App, Auteur ; Stefan Staudt, Auteur ; Kevin Widmann, Auteur Année de publication : 2015 Article en page(s) : p. 124-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Epaisseur -- Mesure Mesure -- Instruments Revêtements poudre:Peinture poudre Statistique Ultrasons Index. décimale : 667.9 Revêtements et enduits Résumé : Powder coating technology is studied during the Chemical Engineering/Colour and Paint course at the University of Applied Sciences, Esslingen. An ultrasonic gauge is used to check application thickness before curing. The accuracy of this instrument was evaluated, and readings were found the correlate well with the final cured film thickness. Note de contenu : - Operating principles and use of the thickness gauge - Statistical analysis of accuracy and reproducibility - Accuracy levels and their improvement - Student experience in practical application tests - Some observations on accuracy and its limites - More extensive results again show good correlations - Quality of results assessed En ligne : https://drive.google.com/file/d/1EQsotzmTw4oUGqexf1J_KIkG9rzD-bxP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23748 [article]

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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)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1581-1596 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 detection DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33411 [article]

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