Investigation of the flow field in thin polymer films due to inhomogeneous drying / Philip Cavadini 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. 927-926 Titre : Investigation of the flow field in thin polymer films due to inhomogeneous drying Type de document : texte imprimé Auteurs : Philip Cavadini, Auteur ; Erz Joachim, Auteur ; Dirk Sachsenheimer, Auteur ; Anne Kowalczyk, Auteur ; Norbert Willenbacher, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 927-926 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces -- Défauts Déformations (mécanique) Fluorescence Mesure -- Instruments Particules (matières) Polyacétate de vinyle Index. décimale : 667.9 Revêtements et enduits Résumé : In the field of organic and printed electronics (e.g., polymer solar cells, OLEDs, or Li-ion batteries), there is a growing demand for thin functional layers with highly homogeneous surface topology. If these layers are coated from the liquid phase, the coating and drying steps affect the surface quality. As a result of inhomogeneous drying rates, the solvent concentration can vary along the top surface and the thickness of a solidifying solution, leading to local differences in surface tension. In turn, Marangoni convection, as the balancing mechanism, can occur and cause surface inhomogeneity. The in situ reconstruction of the free surface during drying has been presented elsewhere. During this investigation phenomena occurred that could not be completely understood without knowledge of the respective flow field. In the present work, the visualization of the flow field in thin polymer films [methanol-poly(vinyl acetate) solution with 67 wt% methanol] due to inhomogeneous drying is presented. To resolve the flow field, we apply fluorescent particle tracking (µPTV). Since both measurement techniques cannot easily be applied at the same time, the boundary conditions were adapted to the way of observation of each experimental setup. In the case of the setup for surface reconstruction of the free surface, locally different evaporation rates were realized by drying on a structured substrate (varying material). To force similar variation of the drying conditions in the case of the µPTV setup, the drying film was partially covered. As expected, both boundary conditions result in a propagating wave front towards regions of high surface tension. Combining both experimental setups, we were able to visualize the free surface and the flow structures up- and downstream of the wave front and found different flow regimes. DOI : 10.1007/s11998-015-9725-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9725-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24693 [article]

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Local heat transfer characteristics of a slot nozzle array for batch drying of thin films under industrial process conditions / Michael Baunach 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. 915-920 Titre : Local heat transfer characteristics of a slot nozzle array for batch drying of thin films under industrial process conditions Type de document : texte imprimé Auteurs : Michael Baunach, Auteur ; Stefan Jaiser, Auteur ; Philip Cavadini, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 915-920 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Revêtements Séchage Thermocinétique Transfert de masse Index. décimale : 667.9 Revêtements et enduits Résumé : For optimizing the drying process of thin functional films, knowledge of the relevant influencing parameters is needed. One paramount parameter for design of experimental conditions and the accurate interpretation of experimental data is the heat transfer coefficient inside a dryer. Information on the heat transfer in a dryer also facilitates a reliable transfer of results obtained in laboratory set-ups to industrial production. In this work, the heat transfer in a batch drying set-up with an array of slot nozzles is investigated. The measurement arrangement consists of a heat flux sensor mounted on the surface of a temperature-controlled plate. For validation of this arrangement, heat transfer measurements with a single round nozzle were compared to transient heat transfer data measured in the batch drying set-up show a periodically homogenous distribution of heat transfer coefficients for the investigated 16 nozzles. This gives the possibility to dry thin films with a coating length of up to 800 mm in the set-up at constant conditions along the coating length. A prerequisite is a periodical movement with an amplitude of at least one nozzle-to-nozzle spacing. DOI : 10.1007/s11998-015-9712-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9712-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24692 [article]

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