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Pressure drop and residence time distribution in carbon-nanofiber/gaphite-felt composite for single liquid-phase flow / Yaojie Cao in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9431-9436 Titre : Pressure drop and residence time distribution in carbon-nanofiber/gaphite-felt composite for single liquid-phase flow Type de document : texte imprimé Auteurs : Yaojie Cao, Auteur ; Ping Li, Auteur ; Jinghong Zhou, Auteur Année de publication : 2011 Article en page(s) : pp. 9431-9436 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Liquid  phase  Composite  material  Residence  time  distribution  Hydrodynamics  Pressure  drop Résumé : Fibrous carbon nanofiber composite is prepared by growing carbon nanofibers on graphite felt Pressure drop experiments are carried out with ethanol solution to study the influence of the liquid surface tension on the permeability of the composite, and residence time distribution experiments with cyclohexane and water respectively are performed to study the effect of the fluid wettability on the flow behavior in the composite. Piston dispersion exchange (PDE) model is employed to determine the dynamic liquid holdup, the axial dispersion, and the mass transfer between the dynamic and static liquids. When the fluid is less oleophilic, less space in the CNF layer will be open for the flow, and the fluid will be more likely to slip over the carbon surface. Compared with the flow in spherical particle packing and in monolith, the mass transfer in the composite is high owing to its fibrous structure that splits the fluid into streamlets. The rate of mass transfer in water is lower than that in cyclohexane because water is only trapped in some of the large pores in the CNF layer while cyclohexane suffuses the whole layer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395888 [article] Pressure drop and residence time distribution in carbon-nanofiber/gaphite-felt composite for single liquid-phase flow [texte imprimé] / Yaojie Cao, Auteur ; Ping Li, Auteur ; Jinghong Zhou, Auteur . - 2011 . - pp. 9431-9436. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9431-9436 Mots-clés : Liquid  phase  Composite  material  Residence  time  distribution  Hydrodynamics  Pressure  drop Résumé : Fibrous carbon nanofiber composite is prepared by growing carbon nanofibers on graphite felt Pressure drop experiments are carried out with ethanol solution to study the influence of the liquid surface tension on the permeability of the composite, and residence time distribution experiments with cyclohexane and water respectively are performed to study the effect of the fluid wettability on the flow behavior in the composite. Piston dispersion exchange (PDE) model is employed to determine the dynamic liquid holdup, the axial dispersion, and the mass transfer between the dynamic and static liquids. When the fluid is less oleophilic, less space in the CNF layer will be open for the flow, and the fluid will be more likely to slip over the carbon surface. Compared with the flow in spherical particle packing and in monolith, the mass transfer in the composite is high owing to its fibrous structure that splits the fluid into streamlets. The rate of mass transfer in water is lower than that in cyclohexane because water is only trapped in some of the large pores in the CNF layer while cyclohexane suffuses the whole layer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395888

Pressure drop of structured packing of carbon nanofiber composite / Yaojie Cao in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3944–3951 Titre : Pressure drop of structured packing of carbon nanofiber composite Type de document : texte imprimé Auteurs : Yaojie Cao, Auteur ; Ping Li, Auteur ; Jinghong Zhou, Auteur Année de publication : 2010 Article en page(s) : pp. 3944–3951 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Carbon  Nanofiber  Composite  Pressure  Structured  Packing Résumé : Carbon nanofibers (CNFs) are grown on graphite fiber felt with a desired shape and dimension to form a structured carbon nanofiber composite. This CNF composite has a bimodal porous structure, containing macropores due to the intertexture of graphite fibers and mesopores due to the intertwist of CNFs. The pressure drop of the composite is derived from the convective flow of fluid through the macropores and is independent of the mesopores. Both viscous and turbulent resistance increases with the CNF’s loading. After being wetted with cyclohexane and dried in the air, the CNF’s layer shrinks and becomes smoother, and the composite has a much smaller viscous and turbulent resistance for the fluid. An extended Ergun equation is developed and is shown to be able to predict very well the pressure drop from the structural parameters that are related to the CNF’s loading, i.e., macropore porosity and expanded diameter of the graphite fibers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9020446 [article] Pressure drop of structured packing of carbon nanofiber composite [texte imprimé] / Yaojie Cao, Auteur ; Ping Li, Auteur ; Jinghong Zhou, Auteur . - 2010 . - pp. 3944–3951. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3944–3951 Mots-clés : Carbon  Nanofiber  Composite  Pressure  Structured  Packing Résumé : Carbon nanofibers (CNFs) are grown on graphite fiber felt with a desired shape and dimension to form a structured carbon nanofiber composite. This CNF composite has a bimodal porous structure, containing macropores due to the intertexture of graphite fibers and mesopores due to the intertwist of CNFs. The pressure drop of the composite is derived from the convective flow of fluid through the macropores and is independent of the mesopores. Both viscous and turbulent resistance increases with the CNF’s loading. After being wetted with cyclohexane and dried in the air, the CNF’s layer shrinks and becomes smoother, and the composite has a much smaller viscous and turbulent resistance for the fluid. An extended Ergun equation is developed and is shown to be able to predict very well the pressure drop from the structural parameters that are related to the CNF’s loading, i.e., macropore porosity and expanded diameter of the graphite fibers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9020446