Caught on camera / Mojgan Nejad in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2015)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2015) . - p. 30-37 Titre : Caught on camera : Defoamer performance measured by evaluation of coating film appearance Type de document : texte imprimé Auteurs : Mojgan Nejad, Auteur ; Maryam Arefmanesh, Auteur ; Katie Hendernesh, Auteur ; Javad Esmaeelpanah, Auteur ; Sanjeev Chandra, Auteur ; Javad Mostaghimi, Auteur Année de publication : 2015 Article en page(s) : p. 30-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimousse Imagerie (technique) Mesure Polyuréthanes Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : To prevent air entrapment and foaming, defoamers are usually added to water-borne coating formulations. Defoamer performance was studied by capturing high resolution images of a coating sprayed on glass substrates. Image analysis provided a quantitative measure of the efficacy of additives. Surprisingly, the most effective product was a non-ionic wetting agent rather than a defoamer. Note de contenu : - Surface tension measurement procedure - Application and imaging procedure - Impact of varying addition rates is checked - Results of bubble entrapment study - Procedure offers potential for more detailled studies En ligne : https://drive.google.com/file/d/1mQXurLwninJIsARNqQGsXJ1DdwVbCd4C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24704 [article]

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Coating the inner surfaces of pipes with high-viscosity epoxy in annular flow / E. Lin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 6 (11/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 6 (11/2011) . - p. 697-706 Titre : Coating the inner surfaces of pipes with high-viscosity epoxy in annular flow Type de document : texte imprimé Auteurs : E. Lin, Auteur ; H. B. Parizi, Auteur ; A. Pourmousa, Auteur ; S. Chandra, Auteur ; Javad Mostaghimi, Auteur Année de publication : 2011 Article en page(s) : p. 697-706 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ecoulement annulaire Epoxydes Revêtements:Peinture Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : Applying a thin, protective coating of a nontoxic, chemically resistant epoxy to the interior of existing pipes is an alternative method to pipe replacement. In order to find the controlling parameters in this method, in this study, viscous epoxy was propelled by compressed air through clear polyvinyl chloride (PVC) pipes. Epoxy flow was annular, and it hardened to form a thin, uniform coating on the inner pipe surface. A video camera was employed to record fluid motion, and the thickness of the coating was measured using an image analysis program named ImagJ. Tests were done with varying air temperature, airflow rate, piping configuration, and epoxy temperature. A one-dimensional numerical algorithm was developed to model fluid flow, heat transfer, and epoxy curing. Heating the epoxy makes it move faster because liquid viscosity decreases with increasing temperature. The coating was significantly thicker at the bottom of a horizontal pipe than at the top due to sagging of the epoxy coating after it had been applied, resulting in flow from the top to the bottom of the pipe. Sagging could be reduced by maintaining airflow until curing was almost complete and the epoxy had hardened enough to prevent it from moving easily. The combination of the experimental results and numerical modeling showed that the most important parameters controlling the speed of the epoxy and coating thickness were the air flow rate and temperature, since they determine the shear forces on the epoxy layer and the rate at which the epoxy cures. Raising air temperature increases the reaction rate and therefore decreases the time required for the epoxy to cure inside the pipe. The results of the simulation showed a very good agreement with the experimental results in pipes with 1-in diameter or less. DOI : 10.1007/s11998-011-9361-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9361-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12596 [article]

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Orange peel formation due to surface tension-driven flows within drying paint films / N. Saranjam in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 413-426 Titre : Orange peel formation due to surface tension-driven flows within drying paint films Type de document : texte imprimé Auteurs : N. Saranjam, Auteur ; S. Chandra, Auteur ; Javad Mostaghimi, Auteur ; H. Fan, Auteur ; J. Simmer, Auteur Année de publication : 2016 Article en page(s) : p. 413-426 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Métaux -- Revêtements:Métaux -- Peinture Revêtement en phase solvant:Peinture en phase solvant Revêtements -- Défauts:Peinture -- Défauts Tension superficielle Transfert de masse Index. décimale : 667.9 Revêtements et enduits Résumé : Paint films with uniform thicknesses ranging from 150 to 820 μm were applied on stainless steel substrates using a model paint consisting of a resin dissolved in butanol and the test samples were cured in a natural convection oven at a temperature of 140°C. Photographs of the paint surface were taken during drying, and the weight loss was measured. Cellular structures appeared on the paint surface, induced by surface tension-driven flows due to solvent concentration variations. For thin films (<500 µm), the patterns disappeared in a few minutes and the dried paint surface was smooth, while for thicker paint films, wave-like structures remained on the hardened paint layer, creating an uneven surface. An analytical solution of the mass-diffusion equation was used to model solvent evaporation from the paint film and to calculate the concentration gradient and surface tension variations in the paint films. In thin films, all the solvent was depleted, and surface tension gradients disappeared before curing was complete, allowing the surface to become smooth. In thicker films, concentration gradients that drove cellular flows persisted until the paint dried, leaving orange peel on the surface. DOI : 10.1007/s11998-015-9752-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9752-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26283 [article]

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