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Fast liquid jet mixing in millimeter channels with various multislits designs / Zhe Liu in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9744–9753 Titre : Fast liquid jet mixing in millimeter channels with various multislits designs Type de document : texte imprimé Auteurs : Zhe Liu, Auteur ; Yi Cheng, Auteur ; Yong Jin, Auteur Année de publication : 2009 Article en page(s) : p. 9744–9753 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Liquid  jet  Millimeter  channels Résumé : The jet flow mixers in which fluids are mixed in the confined millimeter-sized channels were further studied to better understand the fast liquid mixing process and the means to intensify the mixing performance. Four mixer designs with different modifications on the local configuration for adjusted contact mode between liquids were investigated by visualizing the mixing processes using planar laser-induced fluorescence (PLIF) technique. A large amount of experiments with various operating conditions were carried out for all the four designs. The common feature in all the cases was that the two liquids can be mixed well in milliseconds, where the momentum ratio between the bulk and the jet flows played a significant role in the mixing performance. The results also demonstrated that the contact mode between the two liquids had a great effect on the mixing performance. By dividing the side-jet liquid stream into several smaller aperture-jets, the mixing process can be clearly improved, which can be attributed to the increased contact area and the higher velocity difference between the two liquids. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800344p [article] Fast liquid jet mixing in millimeter channels with various multislits designs [texte imprimé] / Zhe Liu, Auteur ; Yi Cheng, Auteur ; Yong Jin, Auteur . - 2009 . - p. 9744–9753. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9744–9753 Mots-clés : Liquid  jet  Millimeter  channels Résumé : The jet flow mixers in which fluids are mixed in the confined millimeter-sized channels were further studied to better understand the fast liquid mixing process and the means to intensify the mixing performance. Four mixer designs with different modifications on the local configuration for adjusted contact mode between liquids were investigated by visualizing the mixing processes using planar laser-induced fluorescence (PLIF) technique. A large amount of experiments with various operating conditions were carried out for all the four designs. The common feature in all the cases was that the two liquids can be mixed well in milliseconds, where the momentum ratio between the bulk and the jet flows played a significant role in the mixing performance. The results also demonstrated that the contact mode between the two liquids had a great effect on the mixing performance. By dividing the side-jet liquid stream into several smaller aperture-jets, the mixing process can be clearly improved, which can be attributed to the increased contact area and the higher velocity difference between the two liquids. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800344p

Understanding riser and downer based fluid catalytic cracking processes by a comprehensive two-dimensional reactor model / Changning Wu in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 12-26 Titre : Understanding riser and downer based fluid catalytic cracking processes by a comprehensive two-dimensional reactor model Type de document : texte imprimé Auteurs : Changning Wu, Editeur scientifique ; Yi Cheng, Editeur scientifique ; Yong Jin, Editeur scientifique Année de publication : 2009 Article en page(s) : p. 12-26 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Two-dimensional  reactor  Fluid  catalytic  cracking Résumé : A two-dimensional reactor model incorporating hydrodynamics, mass balance, energy balance, and a 4-lump/14-lump kinetic model was established to simulate the riser and downer based fluid catalytic cracking (FCC) processes. The kinetic parameters of the 4-lump kinetic model were re-evaluated from the originally published experimental data for a more reliable description of the FCC process. The 14-lump kinetic model based on a molecular description of cracking and hydrogen transfer reactions was to include more details about the feedstock composition, reaction mechanisms, and the products distribution for a better understanding on the reactor performance for FCC process. This comprehensive model captured the key characteristics of the gas−solid reacting flows in the riser and downer, i.e., the uniformity of flow structures, the distinct backmixing behavior in the riser and downer, and the momentum and energy balances during the complex FCC reactions. The model predictions were first validated against industrial data from several literature sources and found to agree with each other reasonably well. Then, the simulations were carried out to fully understand the different reactor performances of riser and downer in the application of FCC refining processes. It can be concluded that the downer benefits from its advantages of the plug-flow nature and uniform flow structures, tending to have more products in the middle distillates, e.g., gasoline and light olefins, especially under high-severity operations. Better control of the reaction extent for increased selectivity to desired intermediate products would allow the use of downer reactors for the larger-scale practical applications in the FCC process, together with the valuable byproduction of light olefins. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800168x [article] Understanding riser and downer based fluid catalytic cracking processes by a comprehensive two-dimensional reactor model [texte imprimé] / Changning Wu, Editeur scientifique ; Yi Cheng, Editeur scientifique ; Yong Jin, Editeur scientifique . - 2009 . - p. 12-26. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 12-26 Mots-clés : Two-dimensional  reactor  Fluid  catalytic  cracking Résumé : A two-dimensional reactor model incorporating hydrodynamics, mass balance, energy balance, and a 4-lump/14-lump kinetic model was established to simulate the riser and downer based fluid catalytic cracking (FCC) processes. The kinetic parameters of the 4-lump kinetic model were re-evaluated from the originally published experimental data for a more reliable description of the FCC process. The 14-lump kinetic model based on a molecular description of cracking and hydrogen transfer reactions was to include more details about the feedstock composition, reaction mechanisms, and the products distribution for a better understanding on the reactor performance for FCC process. This comprehensive model captured the key characteristics of the gas−solid reacting flows in the riser and downer, i.e., the uniformity of flow structures, the distinct backmixing behavior in the riser and downer, and the momentum and energy balances during the complex FCC reactions. The model predictions were first validated against industrial data from several literature sources and found to agree with each other reasonably well. Then, the simulations were carried out to fully understand the different reactor performances of riser and downer in the application of FCC refining processes. It can be concluded that the downer benefits from its advantages of the plug-flow nature and uniform flow structures, tending to have more products in the middle distillates, e.g., gasoline and light olefins, especially under high-severity operations. Better control of the reaction extent for increased selectivity to desired intermediate products would allow the use of downer reactors for the larger-scale practical applications in the FCC process, together with the valuable byproduction of light olefins. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800168x