The effect of solidification on the casting window after bubble entrainment / Zakaria Y. Ahmad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 89-93 Titre : The effect of solidification on the casting window after bubble entrainment Type de document : texte imprimé Auteurs : Zakaria Y. Ahmad, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2014 Article en page(s) : p. 89-93 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Bulles  d'air'  Solifidication  'Enthalpie-Porosité'  'Volume  de  fluide'  'Enduction  par  filière'  Moulage  Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work is to investigate the feasibility of extending the velocity boundary during the slot die casting of a polymer film, by studying the dynamics of entrained bubbles as they transition from the fluid to the solid phase. The solution of interest is a relatively high viscosity non-Newtonian solution. A 2D computational fluid dynamics model, using ANSYS FLUENT 13.0 software, was developed to analyze this behavior. The volume of fluid method and enthalpy–porosity technique were used to track the air (i.e., entrained bubbles) and fluid phases and the solidification of the solution, respectively. It has been found that for this class of solution, bubbles that are entrained in the fluid phase will not diffuse out of the fluid due to the stresses formed during solidification. Thus, for relatively high viscosity non-Newtonian solution, the upper boundary of the casting window cannot be extended after a defect has originated in the film during the casting process. DOI : 10.1007/s11998-013-9502-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9502-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20620 [article]

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Wetting behavior of the shear thinning power law fluids / Sima Didari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 95-102 Titre : Wetting behavior of the shear thinning power law fluids Type de document : texte imprimé Auteurs : Sima Didari, Auteur ; Zakaria Y. Ahmad, Auteur ; James D. Veldhorst, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2014 Article en page(s) : p. 95-102 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Cisaillement (mécanique) Enduction par filière Fluides, Mécanique des Mouillage (chimie des surfaces) Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : The knowledge of the wetting characteristics of a coating solution is a prerequisite of assuring the final quality of thin films manufactured by the slot die coating process. Because the maximum coating speed is limited by defects, such as air entrainment, which are directly related to film quality, an understanding of the coating limits is critical. Despite the existence of a vast body of literature to understand the occurrence of defects and the coating limits to produce defect-free films, the mechanism of air entrainment is still not well understood, especially for various classes of solutions. In this study, the shape of the upstream meniscus of a mildly shear thinning non-Newtonian coating bead has been studied both numerically and experimentally and subsequently linked to the air entrainment threshold. It has been found that the dynamic contact angle reaches its maximum value at the air entrainment threshold, primarily as a function of the capillary number. In addition, this work suggests that the onset of the dripping and air entrainment boundaries of solutions that follow the power law can be predicted based on the dynamic contact angle as a function of the consistency and power law indices. DOI : 10.1007/s11998-013-9503-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9503-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20621 [article]

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