Documents disponibles écrits par cet auteur

Misting of non - newtonian liquids in forward roll coating / Michael S. Owens in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 1123-1128 Titre : Misting of non - newtonian liquids in forward roll coating Type de document : texte imprimé Auteurs : Michael S. Owens, Auteur ; Madhu Vinjamur, Auteur ; L. E. Scriven, Auteur Année de publication : 2011 Article en page(s) : pp. 1123-1128 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nebulization  Dilute  solution  Polymer  solutions  Flow  visualization  Experimental  study  Roller  coating  Hydrodynamics  Viscoelastic  fluid  Non-Newtonian  fluids Résumé : Misting of liquids in forward roll coating is a problem under certain conditions. The relaxation time is known to influence misting but the fundamental mechanisms are not clear. A new mechanism for misting of dilute non-Newtonian liquids was proposed based on visualizations with a high-speed camera. With these liquids, filaments were created which sometimes transformed into beads-on-string structures and the beads were ejected as mist droplets when the structures broke. Misting was quantified by measuring sizes of the generated droplets, their count and mass concentration. The measurements were related to elasticity of the solutions through their relaxation times. Small levels of elasticity reduce the amount of misting, but higher levels lead to an increase. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24497366 [article] Misting of non - newtonian liquids in forward roll coating [texte imprimé] / Michael S. Owens, Auteur ; Madhu Vinjamur, Auteur ; L. E. Scriven, Auteur . - 2011 . - pp. 1123-1128. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 1123-1128 Mots-clés : Nebulization  Dilute  solution  Polymer  solutions  Flow  visualization  Experimental  study  Roller  coating  Hydrodynamics  Viscoelastic  fluid  Non-Newtonian  fluids Résumé : Misting of liquids in forward roll coating is a problem under certain conditions. The relaxation time is known to influence misting but the fundamental mechanisms are not clear. A new mechanism for misting of dilute non-Newtonian liquids was proposed based on visualizations with a high-speed camera. With these liquids, filaments were created which sometimes transformed into beads-on-string structures and the beads were ejected as mist droplets when the structures broke. Misting was quantified by measuring sizes of the generated droplets, their count and mass concentration. The measurements were related to elasticity of the solutions through their relaxation times. Small levels of elasticity reduce the amount of misting, but higher levels lead to an increase. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24497366

Near-optimization of operating conditions and residence times in multizone dryers for polymer coatings / Raj K. Arya in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10504–10514 Titre : Near-optimization of operating conditions and residence times in multizone dryers for polymer coatings Type de document : texte imprimé Auteurs : Raj K. Arya, Auteur ; Madhu Vinjamur, Auteur Année de publication : 2010 Article en page(s) : pp. 10504–10514 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Near-Optimization--Operating  Conditions--Residence--Multizone--Dryers--Polymer  Coatings Résumé : Several polymeric coatings are dried by blowing jets of hot air on them from the top and bottom sides in multizone dryers. The goal of quickly removing solvent from a coating by manipulating air flow and temperature, together called operating conditions in this work, conflicts with the goal of producing blister-free coatings. Optimum operating conditions ensure both minimum residual solvent and no defects. Determining optimum conditions for multizone dryers is a difficult task with severe convergence problems. In this work, an easy method is developed to determine near-optimum operating conditions and residence times. The results indicate that the air flow on the top side should always be lower than or equal to that on the bottom side; the minimum residence time in first zone should be such that, toward the end, the solvent concentration starts to fall at the bottom. As long as the residence times are reasonably long, several different combinations of residence times in the second and subsequent zones nearly minimize residual solvent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900604f [article] Near-optimization of operating conditions and residence times in multizone dryers for polymer coatings [texte imprimé] / Raj K. Arya, Auteur ; Madhu Vinjamur, Auteur . - 2010 . - pp. 10504–10514. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10504–10514 Mots-clés : Near-Optimization--Operating  Conditions--Residence--Multizone--Dryers--Polymer  Coatings Résumé : Several polymeric coatings are dried by blowing jets of hot air on them from the top and bottom sides in multizone dryers. The goal of quickly removing solvent from a coating by manipulating air flow and temperature, together called operating conditions in this work, conflicts with the goal of producing blister-free coatings. Optimum operating conditions ensure both minimum residual solvent and no defects. Determining optimum conditions for multizone dryers is a difficult task with severe convergence problems. In this work, an easy method is developed to determine near-optimum operating conditions and residence times. The results indicate that the air flow on the top side should always be lower than or equal to that on the bottom side; the minimum residence time in first zone should be such that, toward the end, the solvent concentration starts to fall at the bottom. As long as the residence times are reasonably long, several different combinations of residence times in the second and subsequent zones nearly minimize residual solvent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900604f