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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