Documents disponibles écrits par cet auteur

Modeling the influence of particulate protein size on hydrolysis in anaerobic digestion / Saad Aldin in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10843–10849 Titre : Modeling the influence of particulate protein size on hydrolysis in anaerobic digestion Type de document : texte imprimé Auteurs : Saad Aldin, Auteur ; George Nakhla, Auteur ; Madhumita B. Ray, Auteur Année de publication : 2011 Article en page(s) : pp. 10843–10849 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Anaerobic  digestion  Hydrolysis  Modeling Résumé : Batch experiments were performed to investigate the effect of particulate protein size on the hydrolysis of casein in anaerobic degradation. Whereas particle size did not affect the ultimate protein degradation efficiency, the hydrolysis rate coefficient increased from 0.034 to 0.298 day―1 with a change in specific surface area from 0.01 to 0.192 m2/g. The maximum rate of methane production increased from 6 to 14 mL of CH4 per gram of COD added per day with the same change in specific surface area, although the ultimate volume of methane produced was approximately the same despite the change in specific surface area. A mathematical relationship between the hydrolysis rate coefficient and the specific surface area was developed, and a new hydrolysis equation was proposed and verified. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523901 [article] Modeling the influence of particulate protein size on hydrolysis in anaerobic digestion [texte imprimé] / Saad Aldin, Auteur ; George Nakhla, Auteur ; Madhumita B. Ray, Auteur . - 2011 . - pp. 10843–10849. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10843–10849 Mots-clés : Anaerobic  digestion  Hydrolysis  Modeling Résumé : Batch experiments were performed to investigate the effect of particulate protein size on the hydrolysis of casein in anaerobic degradation. Whereas particle size did not affect the ultimate protein degradation efficiency, the hydrolysis rate coefficient increased from 0.034 to 0.298 day―1 with a change in specific surface area from 0.01 to 0.192 m2/g. The maximum rate of methane production increased from 6 to 14 mL of CH4 per gram of COD added per day with the same change in specific surface area, although the ultimate volume of methane produced was approximately the same despite the change in specific surface area. A mathematical relationship between the hydrolysis rate coefficient and the specific surface area was developed, and a new hydrolysis equation was proposed and verified. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523901

Numerical simulation of pneumatic dryers using computational fluid dynamics / Tarek J. Jamaleddine in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5900–5910 Titre : Numerical simulation of pneumatic dryers using computational fluid dynamics Type de document : texte imprimé Auteurs : Tarek J. Jamaleddine, Auteur ; Madhumita B. Ray, Auteur Année de publication : 2010 Article en page(s) : pp. 5900–5910 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hydrodynamic  mechanism  Drying  mechanisms  Gas-solid  flow  Fluid  dynamics Résumé : The hydrodynamic and drying mechanisms of a dilute-phase, gas-solid flow have been predicted in a laboratory and a large-scale pneumatic dryer. A computational fluid dynamics (CFD) method based on the two-fluid multiphase flow model has been adopted. A control-volume based technique implemented in the FLUENT CFD package was applied along with the kinetic theory of granular flow (KTGF) to simulate the flow pattern and heat and mass transfer processes for wet PVC and sand particles by hot air. The mass-weighted averages of theoretical predictions for temperature and moisture content agree well with the experimental data for similar models. User-defined subroutines were added to extend FLUENT capability to account for mixture properties and to simulate the drying rate for surface moisture evaporation and moisture diffusion inside the particulate phase. The present model can be extended to simulate the drying of various temperature sensitive materials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901816s [article] Numerical simulation of pneumatic dryers using computational fluid dynamics [texte imprimé] / Tarek J. Jamaleddine, Auteur ; Madhumita B. Ray, Auteur . - 2010 . - pp. 5900–5910. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5900–5910 Mots-clés : Hydrodynamic  mechanism  Drying  mechanisms  Gas-solid  flow  Fluid  dynamics Résumé : The hydrodynamic and drying mechanisms of a dilute-phase, gas-solid flow have been predicted in a laboratory and a large-scale pneumatic dryer. A computational fluid dynamics (CFD) method based on the two-fluid multiphase flow model has been adopted. A control-volume based technique implemented in the FLUENT CFD package was applied along with the kinetic theory of granular flow (KTGF) to simulate the flow pattern and heat and mass transfer processes for wet PVC and sand particles by hot air. The mass-weighted averages of theoretical predictions for temperature and moisture content agree well with the experimental data for similar models. User-defined subroutines were added to extend FLUENT capability to account for mixture properties and to simulate the drying rate for surface moisture evaporation and moisture diffusion inside the particulate phase. The present model can be extended to simulate the drying of various temperature sensitive materials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901816s

Photodegradation of estrone in solar irradiation / Rajib Roy Chowdhury in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6923–6930 Titre : Photodegradation of estrone in solar irradiation Type de document : texte imprimé Auteurs : Rajib Roy Chowdhury, Auteur ; Paul Charpentier, Auteur ; Madhumita B. Ray, Auteur Année de publication : 2010 Article en page(s) : pp 6923–6930 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Photodegradation  Solar  Irradiation. Résumé : The photodegradation of the steroid estrone (E1), an endocrine disrupting hormone which is commonly released into aquatic environments, was investigated in aqueous solution using natural sunlight (290−700 nm) produced using a solar simulator. The degradation of E1 was found to follow pseudo-first-order kinetics, with the rate constant decreasing slightly with increasing initial concentration and varying linearly with solar intensity in the region of 25−100 mW cm−2. The half-life of E1 using 1 Sun (100 mW cm−2) was measured to be 52.50 min in natural conditions. The rate of mineralization based on total organic carbon (TOC) reduction was lower than E1 degradation, while the TOC of the solution decreased steadily with increased irradiation time. In the presence of humic acid, the photodegradation rate increased significantly, attributed to photosensitization by the reactive species. The solution pH also had a considerable effect on the rate with maximum degradation occurring around neutral pH of 7. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901796x [article] Photodegradation of estrone in solar irradiation [texte imprimé] / Rajib Roy Chowdhury, Auteur ; Paul Charpentier, Auteur ; Madhumita B. Ray, Auteur . - 2010 . - pp 6923–6930. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6923–6930 Mots-clés : Photodegradation  Solar  Irradiation. Résumé : The photodegradation of the steroid estrone (E1), an endocrine disrupting hormone which is commonly released into aquatic environments, was investigated in aqueous solution using natural sunlight (290−700 nm) produced using a solar simulator. The degradation of E1 was found to follow pseudo-first-order kinetics, with the rate constant decreasing slightly with increasing initial concentration and varying linearly with solar intensity in the region of 25−100 mW cm−2. The half-life of E1 using 1 Sun (100 mW cm−2) was measured to be 52.50 min in natural conditions. The rate of mineralization based on total organic carbon (TOC) reduction was lower than E1 degradation, while the TOC of the solution decreased steadily with increased irradiation time. In the presence of humic acid, the photodegradation rate increased significantly, attributed to photosensitization by the reactive species. The solution pH also had a considerable effect on the rate with maximum degradation occurring around neutral pH of 7. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901796x