CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects

Transesterification of triglycerides is a process by which biodiesel is produced. Biodiesel is a sustainable alternative to petroleum diesel; hence, its efficient production is of significant importance. The transesterification of triolein with methanol under supercritical conditions in the presence...

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Autores: Mekala, Samuel Jedidiah, Fontanals García, Alfred|||0000-0001-7188-1253, Guardo Zabaleta, Alfredo de Jesús|||0000-0002-8937-3887
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/126120
Acceso en línea:https://hdl.handle.net/2117/126120
https://dx.doi.org/10.1016/j.supflu.2018.07.024
Access Level:acceso abierto
Palabra clave:Mass transfer
Computational fluid dynamics
Supercritical fluids
Packed bed Heat transfer Mass transfer Particle-to-fluid transport Computational fluid dynamics Wall-to-fluid transport Supercritical fluids Transesterification of vegetable oils
Transferència de massa
Dinàmica de fluids computacional
Fluids supercrítics
Àrees temàtiques de la UPC::Enginyeria química
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spelling CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effectsMekala, Samuel JedidiahFontanals García, Alfred|||0000-0001-7188-1253Guardo Zabaleta, Alfredo de Jesús|||0000-0002-8937-3887Mass transferComputational fluid dynamicsSupercritical fluidsPacked bed Heat transfer Mass transfer Particle-to-fluid transport Computational fluid dynamics Wall-to-fluid transport Supercritical fluids Transesterification of vegetable oilsTransferència de massaDinàmica de fluids computacionalFluids supercríticsÀrees temàtiques de la UPC::Enginyeria químicaTransesterification of triglycerides is a process by which biodiesel is produced. Biodiesel is a sustainable alternative to petroleum diesel; hence, its efficient production is of significant importance. The transesterification of triolein with methanol under supercritical conditions in the presence of a solid catalyst structured as packed beds is of particular interest due to high yields at moderate temperatures and continuous operability. Fundamental understanding of the heat and mass transfer phenomena in a supercritical transesterification reaction is paramount for a better modelling of the reaction. Computational Fluid Dynamics (CFD) were used to study, by means of a simplified numerical model, heat and mass transport phenomena in a supercritical transesterification reactor. The CFD model was built replicating an experimental pilot plant reactor. Simulations were performed for a 3D geometrical model of a packed bed of cylindrical catalysts. Wall-to-fluid and particle-to-fluid heat and mass transfer were studied for a fluid mixture of methanol (CH3OH) and triolein (C57H104O6) along with co-solvent carbon dioxide (CO2), flown into the packed bed under supercritical conditions (25¿MPa, 473.15¿K). Detailed flow, temperature and concentration profiles in packed bed were obtained. Free and forced convection effects for different flow rates were analyzed. Large density gradients were observed near the packed bed inlet, generating hydrodynamic instabilities due to natural convection as observed in Metais-Eckert maps. Heat and mass transfer coefficients were estimated from CFD data, and the obtained values of Nuw, Nup, Shp were compared against empirical models for different flow rates for validation of the CFD data. The simulation data agreed well with empirical correlationsfor predicting transport coefficients.Peer Reviewed20192019-01-0120182018-12-21journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/126120https://dx.doi.org/10.1016/j.supflu.2018.07.024reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1261202026-05-27T15:37:01Z
dc.title.none.fl_str_mv CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
title CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
spellingShingle CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
Mekala, Samuel Jedidiah
Mass transfer
Computational fluid dynamics
Supercritical fluids
Packed bed Heat transfer Mass transfer Particle-to-fluid transport Computational fluid dynamics Wall-to-fluid transport Supercritical fluids Transesterification of vegetable oils
Transferència de massa
Dinàmica de fluids computacional
Fluids supercrítics
Àrees temàtiques de la UPC::Enginyeria química
title_short CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
title_full CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
title_fullStr CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
title_full_unstemmed CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
title_sort CFD study of the supercritical transesterification of triolein: Wall-to-fluid/particle-to fluid transport effects
dc.creator.none.fl_str_mv Mekala, Samuel Jedidiah
Fontanals García, Alfred|||0000-0001-7188-1253
Guardo Zabaleta, Alfredo de Jesús|||0000-0002-8937-3887
author Mekala, Samuel Jedidiah
author_facet Mekala, Samuel Jedidiah
Fontanals García, Alfred|||0000-0001-7188-1253
Guardo Zabaleta, Alfredo de Jesús|||0000-0002-8937-3887
author_role author
author2 Fontanals García, Alfred|||0000-0001-7188-1253
Guardo Zabaleta, Alfredo de Jesús|||0000-0002-8937-3887
author2_role author
author
dc.subject.none.fl_str_mv Mass transfer
Computational fluid dynamics
Supercritical fluids
Packed bed Heat transfer Mass transfer Particle-to-fluid transport Computational fluid dynamics Wall-to-fluid transport Supercritical fluids Transesterification of vegetable oils
Transferència de massa
Dinàmica de fluids computacional
Fluids supercrítics
Àrees temàtiques de la UPC::Enginyeria química
topic Mass transfer
Computational fluid dynamics
Supercritical fluids
Packed bed Heat transfer Mass transfer Particle-to-fluid transport Computational fluid dynamics Wall-to-fluid transport Supercritical fluids Transesterification of vegetable oils
Transferència de massa
Dinàmica de fluids computacional
Fluids supercrítics
Àrees temàtiques de la UPC::Enginyeria química
description Transesterification of triglycerides is a process by which biodiesel is produced. Biodiesel is a sustainable alternative to petroleum diesel; hence, its efficient production is of significant importance. The transesterification of triolein with methanol under supercritical conditions in the presence of a solid catalyst structured as packed beds is of particular interest due to high yields at moderate temperatures and continuous operability. Fundamental understanding of the heat and mass transfer phenomena in a supercritical transesterification reaction is paramount for a better modelling of the reaction. Computational Fluid Dynamics (CFD) were used to study, by means of a simplified numerical model, heat and mass transport phenomena in a supercritical transesterification reactor. The CFD model was built replicating an experimental pilot plant reactor. Simulations were performed for a 3D geometrical model of a packed bed of cylindrical catalysts. Wall-to-fluid and particle-to-fluid heat and mass transfer were studied for a fluid mixture of methanol (CH3OH) and triolein (C57H104O6) along with co-solvent carbon dioxide (CO2), flown into the packed bed under supercritical conditions (25¿MPa, 473.15¿K). Detailed flow, temperature and concentration profiles in packed bed were obtained. Free and forced convection effects for different flow rates were analyzed. Large density gradients were observed near the packed bed inlet, generating hydrodynamic instabilities due to natural convection as observed in Metais-Eckert maps. Heat and mass transfer coefficients were estimated from CFD data, and the obtained values of Nuw, Nup, Shp were compared against empirical models for different flow rates for validation of the CFD data. The simulation data agreed well with empirical correlationsfor predicting transport coefficients.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-12-21
2019
2019-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/126120
https://dx.doi.org/10.1016/j.supflu.2018.07.024
url https://hdl.handle.net/2117/126120
https://dx.doi.org/10.1016/j.supflu.2018.07.024
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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