Encontrados 28 documentos, a visualizar página 1 de 3
Porous medium burners for the combustion of gases from landfills. The direct si...
Malico, IsabelLandfill methane recovery associated to its conversion to carbon dioxide through combustion is a common greenhouse gas mitigation strategy in developed countries. The typically low and fluctuating energy content of landfill gas makes combustion challenging. Among the several possible energy conversion technologies, innovative porous burners are a potential option. These burners offer a set of advantages when co...
Pore scale simulation of fluid flow and heat transfer in porous media
Ferreira de Sousa, Paulo; Malico, IsabelThis paper presents an immersed boundary method for the calculation of fluid flow and heat transfer in porous media. A two-dimensional compact finite differences immersed boundary method was used to solve the unsteady, incompressible mass, momentum and energy conservation equations. The temporal and spatial discretizations are preformed, respectively, with a fourth-order Runge-Kutta method and a fourth-order co...
A survey system to present the status of anaerobic digestion in Europe in diff...
Körner, Ina; Amon, Barbara; Amon, Thomas; Balsari, Paolo; Bioteau, Thierry; Dach, jacek; De Buisomje, Fridtjof; Deipser, Anna; Fabbri, ClaudioThe RAMIRAN Anaerobic Digestion (AD) Task Group has completed a second survey of the status of European biogas for the years 2010/12. The survey has been split into agricultural, industrial, urban waste and wastewater sectors and data has been collected from eleven countries for at least one of these sectors. The questions included driving forces, the number, type and size of plants, substrates, utilisation of ...
Fome de energia? Do desperdício à poupança
Malico, IsabelA intensificação das atividades económicas a nível mundial e o aumento da população amplificam alguns dos problemas ambientais que a humanidade enfrenta hoje em dia. Alguns deles prendem-se com a conversão e utilização de energia. No seu relatório anual de 2012, a Agência Internacional de Energia refere que em 2035 as necessidades energéticas mundiais serão mais de 1/3 superiores às atuais [1]. Nos países da OC...
Algumas considerações sobre os dados de fluxo de calor obtidos no sul de Portugal
Duque, Maria Rosa Alves; Malico, IsabelSUMMARY The heat flow density data published in the geothermal Atlas of Europe(1992) show relatively high values for temperature gradients and for thermal conductivity obtained in the SW area of the Iberian Peninsula . In the first part of this study we explain how an anomalous value of thermal conductivity or heat production value can influence heat flow density values. In the second part we try to explain the...
Modeling the pore level fluid flow in porous media using the immersed boundary ...
Malico, Isabel; Ferreira de Sousa, PauloThis chapter demonstrates the potential of the immersed boundary method for the direct numerical simulation of the flow through porous media. A 2D compact finite differences method was employed to solve the unsteady incompressible Navier-Stokes equations with fourth-order Runge-Kutta temporal discretization and fourth-order compact schemes for spatial discretization. The solutions were obtained in a Cartesian g...
Study of high Reynolds number pipe flows with porous inserts
Pereira, José Carlos F.; Malico, Isabel; Hayashi, Thamy C.; Raposo, Jorge M. F.This paper reports experiments and calculations for the flow at the inlet and exit of a ceramic foam located in a straight pipe and in a pipe with a 1:4 sudden expansion. For the latter, the foam, with thickness to diameter ratio between 0.15 and 0.60, was located at different distances from the sudden expansion wall. Three different pore sizes (10, 20 and 60 ppi) were investigated for pore Reynolds numbers in ...
Numerical Simulation of 2D Flow through a Packed Bed of Square Cylinders
Ferreira de Sousa, Paulo J. S. A.; Malico, Isabel; Fernandes, GérsonThis paper is centred on a compact finite differences method for the calculation of two-dimensional viscous flows through complex geometries. The immersed boundaries are set through body forces that allow for the imposition of boundary conditions that coincide with the computational grid. Two different flow configurations are simulated. First, the flow past a cylinder with square cross-section inside a plane ch...
Biogas in Portugal: status and public policies in a European context
Ferreira, Miguel; Marques, Isabel Paula; Malico, IsabelThe current status and legal framework of biogas production in Portugal are analyzed and compared to that of five other European countries, characterized by wide-ranging diversity of substrates and biogas applications. With this comparison, and with the calculation of the biogas energy potential in Portugal, the authors want to assess the significance of developing the Portuguese biogas sector. This study illus...
Simulation of a downdraft gasifier
Branquinho, Mónica; Itai, Yuu; Malico, Isabel; Brasil, Augusto C. M.The Brazilian electric grid is managed by ELETROBRAS, a company controlled by the Brazilian Government. According to ELETROBRAS there are 1.2 million consumers in the Amazon region that are not connected to the grid. This is a low population density region, with 205 MW of off grid energy production systems installed and highly dependent of petrodiesel. Some authors showed that gasification systems with power be...
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