Documents disponibles écrits par cet auteur

Effects of orifice angle and surface roughness on the bubbling - to - jetting regime transition in a bubble column / Carlos Irrgang in Industrial & engineering chemistry research, Vol. 51 N° 11 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4445-4451 Titre : Effects of orifice angle and surface roughness on the bubbling - to - jetting regime transition in a bubble column Type de document : texte imprimé Auteurs : Carlos Irrgang, Auteur ; Olaf Hinrichsen, Auteur ; Raymond Lau, Auteur Année de publication : 2012 Article en page(s) : pp. 4445-4451 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Bubble  column  Bubbling  Roughness Résumé : Submerged gas injection into liquids is a widely applied processing technique. The main objective of the current study was to determine the effects of orifice angle and orifice surface roughness on the bubbling-to-jetting regime transition in a bubble column. The bubbling behaviors at single-orifice distributors were investigated over a wide range of orifice gas velocities. The pressure fluctuations in the plenum and high-speed image sequence of the bubble emerging process at the orifice were recorded in experiments. Both orifice angle and orifice surface roughness were found to have significant effects on the regime-transition velocity between the bubbling and jetting regimes. Models were also developed by incorporating those available in the literature with the experimental results obtained in the current study. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655653 [article] Effects of orifice angle and surface roughness on the bubbling - to - jetting regime transition in a bubble column [texte imprimé] / Carlos Irrgang, Auteur ; Olaf Hinrichsen, Auteur ; Raymond Lau, Auteur . - 2012 . - pp. 4445-4451. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4445-4451 Mots-clés : Bubble  column  Bubbling  Roughness Résumé : Submerged gas injection into liquids is a widely applied processing technique. The main objective of the current study was to determine the effects of orifice angle and orifice surface roughness on the bubbling-to-jetting regime transition in a bubble column. The bubbling behaviors at single-orifice distributors were investigated over a wide range of orifice gas velocities. The pressure fluctuations in the plenum and high-speed image sequence of the bubble emerging process at the orifice were recorded in experiments. Both orifice angle and orifice surface roughness were found to have significant effects on the regime-transition velocity between the bubbling and jetting regimes. Models were also developed by incorporating those available in the literature with the experimental results obtained in the current study. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655653

Revisit of the wall effect on the settling of cylindrical particles in the inertial regime / Raymond Lau in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8870–8876 Titre : Revisit of the wall effect on the settling of cylindrical particles in the inertial regime Type de document : texte imprimé Auteurs : Raymond Lau, Auteur ; Meer Saiful Hassan, Auteur ; Wenyin Wong, Auteur Année de publication : 2010 Article en page(s) : pp. 8870–8876 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Cylindrical  Particles Résumé : The wall effect on the settling of cylindrical particles in the inertial regime is revisited. This study covers particle Reynolds number from 600 to 16 100 and particle-length-to-diameter ratios (l/d) from 4 to 21. The wall factor (Ut/Ut,∞) is found to decrease initially as the particle-to-column diameter ratio (d/D) increases. When the wall effect becomes significant, Ut/Ut,∞ starts to increase with an increase in d/D due to a change of the particle orientation during settling. After Ut/Ut,∞ reaches a maximum, it decreases to 0 when d/D increases to 1. A semiempirical model is developed to predict the wall effect of settling of cylindrical particles over the whole range of d/D. The model shows good prediction to the experimental results and matches the wall factor models developed for spherical particles when l/d approaches 1. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012807 [article] Revisit of the wall effect on the settling of cylindrical particles in the inertial regime [texte imprimé] / Raymond Lau, Auteur ; Meer Saiful Hassan, Auteur ; Wenyin Wong, Auteur . - 2010 . - pp. 8870–8876. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8870–8876 Mots-clés : Cylindrical  Particles Résumé : The wall effect on the settling of cylindrical particles in the inertial regime is revisited. This study covers particle Reynolds number from 600 to 16 100 and particle-length-to-diameter ratios (l/d) from 4 to 21. The wall factor (Ut/Ut,∞) is found to decrease initially as the particle-to-column diameter ratio (d/D) increases. When the wall effect becomes significant, Ut/Ut,∞ starts to increase with an increase in d/D due to a change of the particle orientation during settling. After Ut/Ut,∞ reaches a maximum, it decreases to 0 when d/D increases to 1. A semiempirical model is developed to predict the wall effect of settling of cylindrical particles over the whole range of d/D. The model shows good prediction to the experimental results and matches the wall factor models developed for spherical particles when l/d approaches 1. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012807