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A dynamic two phase flow model for a pilot scale sodium borohydride hydrogen ge...
Sousa, T.; Rangel, C. M.A two-dimensional, non-isothermal and dynamic model was developed to describe a sodium borohydride/hydrogen reactor for stationary use. All relevant transport phenomena were treated in detail and the kinetic model developed previously by the authors was introduced into the algorithm. In this paper the reactive solution was modelled as a two phase flow; with this approach the impact of the hydrogen production on...
Simulation of a stand-alone residential PEMFC power system with sodium borohydr...
Pinto, P. J. R.; Sousa, T.; Fernandes, Vitor R.; Pinto, A. M. F. R.; Rangel, C. M.Catalytic hydrolysis of sodium borohydride (NaBH4) has been investigated as a method to generate hydrogen for fuel cell applications. The high purity of the generated hydrogen makes this process a potential source of hydrogen for polymer electrolyte membrane fuel cells (PEMFCs). In this paper, a PEMFC power system employing a NaBH4 hydrogen generator is designed to supply continuous power to residential power ...
A dynamic two phase flow model for a pilot scale sodium borohydride hydrogen ge...
Sousa, T.; Rangel, C. M.A two-dimensional, non-isothermal, and dynamic model was developed to describe a sodium borohydride/hydrogen re-actor for stationary use. All relevant transport phenomena were treated in detail and the kinetic model developed previ-ously by the authors was introduced into the algorithm. In this paper the reactive solution was modeled as a two phase flow; with this approach the impact of the hydrogen production ...
Three dimensional model of a high temperature PEMFC. Study of the flow field ef...
Sousa, T.; Mamlouk, M.; Scott, K.; Rangel, C. M.A three-dimensional isothermal model of a high temperature polymer membrane fuel cell equipped with polybenzimidazole membrane is described. All major transport phenomena were taken into account except the species crossover through the membrane. The cathode catalyst layer was treated as spherical catalyst agglomerates with porous inter-agglomerate spaces. The inter-agglomerate spaces were filled with a mixture ...
A sodium borohydride hydrogen generation reactor for stationary applications: E...
Sousa, T.; Fernandes, Vitor R.; Pinto, P. J. R.; Slavkov, Y.; Bosukov, L.; Rangel, C. M.Ruthenium on nickel-foam catalyst was prepared for hydrogen production from the hydrolysis reaction of an alkaline NaBH4 solution. Experiments were carried out at five temperatures (30, 40, 45, 50 and 60 °C) in a 0.1 dm3 small batch reactor. To understand the kinetic behaviour of the hydrolysis reaction in the presence of this catalyst, the experimental data were fitted to three kinetic models (zero-order, firs...
Current density distribution mapping in polymer electrolyte membrane fuel cell
Sousa, T.; Falcão, D. S.; Pinto, A. M. F. R.; Rangel, C. M.A non-uniform utilization of the active area due to inhomogeneous current density distribution is one of the main factors for poor fuel cell performance. Furthermore, it leads to hot points which can be responsible for thermal stress in the membrane electrode assemble (MEA). Therefore, it became extremely important to have a consistent technic to visualize in real time the current density and temperature distri...
Three dimensional model of a high temperature PEMFC using PBI doped phosphoric ...
Sousa, T.; Mamlouk, M.; Rangel, C. M.; Scott, K.A three-dimensional isothermal model of a high temperature polymer membrane fuel cell equipped with polybenzimidazole (PBI) membrane is described. All major transport phenomena were taken into account except the species cross-over thought the membrane. The cathode catalyst layer was treated as spherical catalyst agglomerates with porous inter-agglomerate spaces. The inter-agglomerate spaces were filled with a m...
Cirurgia “Fast-Track no Colon: Resultados de um Estudo Piloto
Silva, J. P.; Serviço de Oncologia Cirúrgica, Instituto Português de Oncologia, EPE, Porto, PortugalObjectivos: Estudar a viabilidade da aplicação do modelo da cirurgia “fast track” em doentes portadores com neoplasia do cólon e submetidos a cirurgia radical. Material e métodos: Estudo piloto, prospectivo, que decorreu entre Novembro de 2007 e Junho de 2008, período no qual foram operados, por laparotomia, 30 doentes portadores de neoplasia do cólon. As variáveis estudadas incluíram: características demográfi...
Transmissão de Lasiodiplodia theobromae, agente da resinose, em propágulos de c...
CARDOSO, J. E.; VIANA, F. M. P.; BEZERRA, M. A.; SOUSA, T. R. M. de; CYSNE, A. Q.; FARIAS, F. C.2009
Características sociais dos produtores rurais de mandioca do assentamento Casa ...
BELCHIOR, E. B.; LÔBO, C. F.; SOUZA, M. A. de; ARAUJO, A. K. S.; SOUSA, T. C. R. de2009
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