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Mechanisms of in-line coalescence of two-unequal bubbles in a non-Newtonian fluid / Tsao-Jen Lin in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 750-756 Titre : Mechanisms of in-line coalescence of two-unequal bubbles in a non-Newtonian fluid Type de document : texte imprimé Auteurs : Tsao-Jen Lin, Auteur ; Gen-Ming Lin, Auteur Année de publication : 2010 Article en page(s) : pp. 750-756 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Bubble  coalescence  Non-Newtonian  fluid  Particle  image  analyzer  Visualization Index. décimale : 660 Résumé : The coalescing mechanism of in-line two-unequal bubbles rising in a bubble column with a non-Newtonian fluid has been experimentally studied. The non-Newtonian fluid is the 1.5 wt% polyacryamide in demineralized water and the bubble gas is air. Both qualitative flow visualization and quantitative full-field measurements using particle image analyzer have been conducted for two examples of two-unequal bubble coalescences. The instantaneous flow structure and the shear stress contour varying in different time lags are presented. As two-unequal bubbles are getting closer, the drained liquid is circulated to the back of the trailing bubble. Due to the drainage flow and the mutual interactions, the flow structure and the shear stress contour show a dramatic change from a two independent bubbles to a single bubble. Due to encounter these dynamic flow structures, the shape of the trailing bubble also has serial changes. However, the case of large trailing bubble with large momentum can affect the deformation of the small leading bubble earlier. Due to the dragging force caused by the negative pressure and the shear-thinning effect and the pushing force caused by the viscoelastic effect, the acceleration of the trailing bubble to the leading bubble is evident. It was found that the coalescence of two-unequal bubbles has higher acceleration than the coalescence of two-equal bubbles. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X8CD4K-1&_user=6 [...] [article] Mechanisms of in-line coalescence of two-unequal bubbles in a non-Newtonian fluid [texte imprimé] / Tsao-Jen Lin, Auteur ; Gen-Ming Lin, Auteur . - 2010 . - pp. 750-756. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 750-756 Mots-clés : Bubble  coalescence  Non-Newtonian  fluid  Particle  image  analyzer  Visualization Index. décimale : 660 Résumé : The coalescing mechanism of in-line two-unequal bubbles rising in a bubble column with a non-Newtonian fluid has been experimentally studied. The non-Newtonian fluid is the 1.5 wt% polyacryamide in demineralized water and the bubble gas is air. Both qualitative flow visualization and quantitative full-field measurements using particle image analyzer have been conducted for two examples of two-unequal bubble coalescences. The instantaneous flow structure and the shear stress contour varying in different time lags are presented. As two-unequal bubbles are getting closer, the drained liquid is circulated to the back of the trailing bubble. Due to the drainage flow and the mutual interactions, the flow structure and the shear stress contour show a dramatic change from a two independent bubbles to a single bubble. Due to encounter these dynamic flow structures, the shape of the trailing bubble also has serial changes. However, the case of large trailing bubble with large momentum can affect the deformation of the small leading bubble earlier. Due to the dragging force caused by the negative pressure and the shear-thinning effect and the pushing force caused by the viscoelastic effect, the acceleration of the trailing bubble to the leading bubble is evident. It was found that the coalescence of two-unequal bubbles has higher acceleration than the coalescence of two-equal bubbles. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X8CD4K-1&_user=6 [...]