Documents disponibles écrits par cet auteur

Hydrodynamic characteristics of a sparged gas−liquid contactor for fine bubble generation / Chakraborty, D. in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11225–11229 Titre : Hydrodynamic characteristics of a sparged gas−liquid contactor for fine bubble generation Type de document : texte imprimé Auteurs : Chakraborty, D., Auteur ; G. Siva Rama Krishna, Auteur ; S. Chakraborty, Auteur Année de publication : 2010 Article en page(s) : pp. 11225–11229 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrodynamic--Characteristics--Sparged--Gas−Liquid--Contactor--Bubble--Generation Résumé : In this study, hydrodynamics of a gas−liquid bubble column with a following sparger made of ceramic, a perforated metal plate, brick material, and polypor porous material has been presented. Experiments were conducted for water levels of 100, 125, and 150 cm with and without the addition of frother. An attempt has been made to investigate the hydrodynamics of the downward flow of a high-pressure water jet at different jet heights and different water velocities. The column was operated with air at superficial gas velocities in the range of 0.122−3.7 cm/s. Effects of superficial gas velocity, frother doses, and jet height on gas holdup have been presented. Depending on experimental operating conditions for gas holdup, flow regimes were identified for different spargers. Experimental results shows that a ceramic type sparger has better gas holdup compared to other spargers. It was also found that gas holdup is greater with the addition of frother (70%) compared to that without addition of frother (20%). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901322e [article] Hydrodynamic characteristics of a sparged gas−liquid contactor for fine bubble generation [texte imprimé] / Chakraborty, D., Auteur ; G. Siva Rama Krishna, Auteur ; S. Chakraborty, Auteur . - 2010 . - pp. 11225–11229. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11225–11229 Mots-clés : Hydrodynamic--Characteristics--Sparged--Gas−Liquid--Contactor--Bubble--Generation Résumé : In this study, hydrodynamics of a gas−liquid bubble column with a following sparger made of ceramic, a perforated metal plate, brick material, and polypor porous material has been presented. Experiments were conducted for water levels of 100, 125, and 150 cm with and without the addition of frother. An attempt has been made to investigate the hydrodynamics of the downward flow of a high-pressure water jet at different jet heights and different water velocities. The column was operated with air at superficial gas velocities in the range of 0.122−3.7 cm/s. Effects of superficial gas velocity, frother doses, and jet height on gas holdup have been presented. Depending on experimental operating conditions for gas holdup, flow regimes were identified for different spargers. Experimental results shows that a ceramic type sparger has better gas holdup compared to other spargers. It was also found that gas holdup is greater with the addition of frother (70%) compared to that without addition of frother (20%). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901322e

Hydrodynamic characteristics of a sparged gas−liquid contactor for fine bubble generation / Chakraborty, D. in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11225–11229 Titre : Hydrodynamic characteristics of a sparged gas−liquid contactor for fine bubble generation Type de document : texte imprimé Auteurs : Chakraborty, D., Auteur ; G. Siva Rama Krishna, Auteur ; S. Chakraborty, Auteur Année de publication : 2010 Article en page(s) : pp. 11225–11229 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas−liquid  bubble  column  Hydrodynamics  Bubble  generation Résumé : In this study, hydrodynamics of a gas−liquid bubble column with a following sparger made of ceramic, a perforated metal plate, brick material, and polypor porous material has been presented. Experiments were conducted for water levels of 100, 125, and 150 cm with and without the addition of frother. An attempt has been made to investigate the hydrodynamics of the downward flow of a high-pressure water jet at different jet heights and different water velocities. The column was operated with air at superficial gas velocities in the range of 0.122−3.7 cm/s. Effects of superficial gas velocity, frother doses, and jet height on gas holdup have been presented. Depending on experimental operating conditions for gas holdup, flow regimes were identified for different spargers. Experimental results shows that a ceramic type sparger has better gas holdup compared to other spargers. It was also found that gas holdup is greater with the addition of frother (70%) compared to that without addition of frother (20%). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901322e [article] Hydrodynamic characteristics of a sparged gas−liquid contactor for fine bubble generation [texte imprimé] / Chakraborty, D., Auteur ; G. Siva Rama Krishna, Auteur ; S. Chakraborty, Auteur . - 2010 . - pp. 11225–11229. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11225–11229 Mots-clés : Gas−liquid  bubble  column  Hydrodynamics  Bubble  generation Résumé : In this study, hydrodynamics of a gas−liquid bubble column with a following sparger made of ceramic, a perforated metal plate, brick material, and polypor porous material has been presented. Experiments were conducted for water levels of 100, 125, and 150 cm with and without the addition of frother. An attempt has been made to investigate the hydrodynamics of the downward flow of a high-pressure water jet at different jet heights and different water velocities. The column was operated with air at superficial gas velocities in the range of 0.122−3.7 cm/s. Effects of superficial gas velocity, frother doses, and jet height on gas holdup have been presented. Depending on experimental operating conditions for gas holdup, flow regimes were identified for different spargers. Experimental results shows that a ceramic type sparger has better gas holdup compared to other spargers. It was also found that gas holdup is greater with the addition of frother (70%) compared to that without addition of frother (20%). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901322e

Optimal Pumping from Skimming Wells / Rao, S. V. in Journal of hydrologic engineering, Vol. 11 N°5 (Septembre/Octobre 2006) 

Public ISBD [article]  in Journal of hydrologic engineering > Vol. 11 N°5 (Septembre/Octobre 2006) . - 464-471 p. Titre : Optimal Pumping from Skimming Wells Titre original : Pompage Optimal par des Puits d'Ecrémage Type de document : texte imprimé Auteurs : Rao, S. V., Auteur ; Chakraborty, D. ; Shekhar, Shashank, Auteur Article en page(s) : 464-471 p. Note générale : Hydrologie Langues : Anglais (eng) Mots-clés : Neural  networks  Simulation  Wells  Ground  water  Reseaux  neurologiques  Puits  Eaux  souterraines Index. décimale : 621.3 Ingénierie électrique Résumé : A field problem involving pumping of groundwater from a series of existing skimming wells to meet drinking water needs from a river flood plain is examined within a conceptual framework. A simplified hypothetical aquifer system that is representative of a study area, skimming wells, input variables, and aquifer parameters is solved using a simulation-optimization (S/O) approach. The S/O model proposed in this study is solved as a nonlinear, nonconvex problem using a simulated annealing algorithm and a variable density flow simulator. An artificial neural network is used to replace the simulator to reduce the computational burden. An optimal pumping schedule in terms of location and pumpages is presented that controls up coning from underlying saline water. The study suggests that an increased number of skimming wells do not necessarily yield more water, and that the pumping schedule must be staggered in space and time. Un problème de champ comportant le pompage des eaux souterraines d'une série de puits d'écrémage existants pour satisfaire les besoins d'eau potable d'un fleuve inonde tout simplement est examiné dans un cadre conceptuel. Un système hypothétique simplifié de couche aquifère qui est représentant d'un secteur d'étude, écrémant des puits, des variables d'entrée, et des paramètres de couche aquifère est résolu en utilisant une approche de la'simulation-optimisation (S/O). Les S/O modèle proposé dans cette étude sont résolus comme problème non-linéaire et non convexe à l'aide d'un algorithme de recuit simulé et d'un simulateur variable d'écoulement de densité. Un réseau neurologique artificiel est employé pour remplacer le simulateur pour réduire le fardeau informatique. Un programme de pompage optimal en termes d'endroit et pumpages est présenté que des commandes vers le haut du conage de l'eau saline fondamentale. L'étude suggère qu'un plus grand nombre d'écrémer des puits ne rapportent pas nécessairement plus d'eau, et que le programme de pompage doit être décalé dans l'espace et le temps. En ligne : shedimbi@yahoo.com [article] Optimal Pumping from Skimming Wells = Pompage Optimal par des Puits d'Ecrémage [texte imprimé] / Rao, S. V., Auteur ; Chakraborty, D. ; Shekhar, Shashank, Auteur . - 464-471 p. Hydrologie Langues : Anglais (eng) in Journal of hydrologic engineering > Vol. 11 N°5 (Septembre/Octobre 2006) . - 464-471 p. Mots-clés : Neural  networks  Simulation  Wells  Ground  water  Reseaux  neurologiques  Puits  Eaux  souterraines Index. décimale : 621.3 Ingénierie électrique Résumé : A field problem involving pumping of groundwater from a series of existing skimming wells to meet drinking water needs from a river flood plain is examined within a conceptual framework. A simplified hypothetical aquifer system that is representative of a study area, skimming wells, input variables, and aquifer parameters is solved using a simulation-optimization (S/O) approach. The S/O model proposed in this study is solved as a nonlinear, nonconvex problem using a simulated annealing algorithm and a variable density flow simulator. An artificial neural network is used to replace the simulator to reduce the computational burden. An optimal pumping schedule in terms of location and pumpages is presented that controls up coning from underlying saline water. The study suggests that an increased number of skimming wells do not necessarily yield more water, and that the pumping schedule must be staggered in space and time. Un problème de champ comportant le pompage des eaux souterraines d'une série de puits d'écrémage existants pour satisfaire les besoins d'eau potable d'un fleuve inonde tout simplement est examiné dans un cadre conceptuel. Un système hypothétique simplifié de couche aquifère qui est représentant d'un secteur d'étude, écrémant des puits, des variables d'entrée, et des paramètres de couche aquifère est résolu en utilisant une approche de la'simulation-optimisation (S/O). Les S/O modèle proposé dans cette étude sont résolus comme problème non-linéaire et non convexe à l'aide d'un algorithme de recuit simulé et d'un simulateur variable d'écoulement de densité. Un réseau neurologique artificiel est employé pour remplacer le simulateur pour réduire le fardeau informatique. Un programme de pompage optimal en termes d'endroit et pumpages est présenté que des commandes vers le haut du conage de l'eau saline fondamentale. L'étude suggère qu'un plus grand nombre d'écrémer des puits ne rapportent pas nécessairement plus d'eau, et que le programme de pompage doit être décalé dans l'espace et le temps. En ligne : shedimbi@yahoo.com