173 resultados para Materiais porosos Escoamento Métodos de simulação
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comum nas reas rurais a utilizao de métodos de irrigao que consistem em bombear a gua de audes, lagoas e rios para irrigar a terra onde est sendo cultivada determinada cultura. Em geral esse bombeamento feito por motores movidos energia eltrica ou leo diesel. Este trabalho visa avaliar os motores eltricos de baixa potncia que so usados para irrigar pequenas reas plantadas atravs de bombeamento de gua de audes, lagoas etc. Os métodos a serem usados competem aplicao da Fsica e do Calculo Diferencial e Integral, atravs do uso de conceitos,integrais definidas e do uso de slidos de revoluo para simulação. Podero ser feitas associaes entre vazo de gua, potncia necessria para o servio, a quantidade de tempo que a reserva de gua sustenta o bombeamento. Depois de feito os clculos pode se concluir sobre o tipo de motor e potencia mais adequada para tal servio. Este projeto visa avaliar o desempenho de motores eltrico de baixa potencia no bombeamento de gua atravs de métodos pertinentes ao calculo diferencial e integral e ao mesmo tempo poder mostrar uma das vrias aplicaes desta disciplina. Aps os clculos realizados espera-se obter concluses sobre os motores eltricos e fazer a associao do servio que recomendado para o seu uso. Sero utilizados métodos do clculo diferencial e Integral para a avaliao do desempenho do motor e conceitos da Fsica para determinao e associao entre potncia dissipada e vazo de gua.
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The morphometric characterization of watersheds is of great importance in assisting the planning of these areas to preserve the environment and maintain the quantity and quality of water production. The aim of this study was to characterize the morphology and simulate the areas of permanent preservation according to the Brazilian Forest Code of watershed of the gua-Fria stream. The studied area is located in the municipality of Bofete-SP, between the geographic coordinates: 48 09' 30" to 48 18' 30" longitude (WGr) and 22 58' 30" to 23 04' 30" latitude S. The results showed a 5th order micro watershed with an area of 152.43 km2 and low drainage density of 1.04 km/km2. Circularity was 0.51 and form factor was 0.41, which is considered low, and therefore with an oblong/oval shape. The sinuosity index of 1.29 revealed a tendency of rectilinear channels with compactness coefficient value of 1.38 and distance of runoff flow of 520m. Simulation of areas of permanent preservation shows an ideal model as the way springs and watercourses should be protected according to the Brazilian Forest Code, amounting to an area of 10.02 km2.
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)
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The civil construction sector in Brazil is, simultaneously, a necessity that drives the economy and an evil that degrades the environment. Simple choices adopted in an enterprise can make big difference in harm caused by constructive practices, minimizing its harmful to the environment and making it sustainable. These choices, however, involve the use of materials and techniques often unknown by the builders, since the construction industry is very traditional. Even worse, the eco-friendly materials and sustainable techniques also face another obstacle to its use: the prejudice. Builders and customers prefer traditional methods to sustain belief that they present lower quality and higher price. This work raises awareness of the urgency with traditional methods must be overridden, showing practical and simple ways for this replacement, as well as confirm the quality equal to or even higher in the use of alternative materials and techniques, without addition in cost. Thus, the benefits are generated for all parties involved, from builders to residents
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The optimization of energy generation systems has become a key issue for technological and social development, mainly in developing countries, where the electricity consumption rises sharply. Gas turbine cycle is an electricity generating system, which studies have demonstrated that inlet air cooling increases net power and thermal efficiency. Thus, this study intends to quantify these parameters for environments with different ambient temperature and relative humidity. Two types of air cooling were used: evaporative and absorption systems. The configuration parameters only with the gas turbine cycle were compared to those whose configuration allowed cooling. First, it was analyzed only evaporative cooling. Next, the absorption system was used for analysis. The last configuration mixed these two methods, dividing equally its flow. The results showed that thermal efficiency and net power increase in any case of cooling, with absorption system more advantageous in terms of generated energy, where an increase between 1 and 2 MW was observed, depending on the ambient conditions . When the two methods were working together at low relative humidity, it showed a thermal efficiency increase compared to absorption system, up to 2.4%. Evaporative cooling was less effective, but it is a good and cheap possibility to increase the cycle parameters at high temperature and low relative humidity
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The search for mechanical components validation methods, employed in product development sector, becomes more avid for less expensive solutions. As a result, programs that can simulate forces acting on a given part through finite element method are gaining more space in the market, once this process consumes less capital when compared to currently-employed empirical validation. This article shows the simulation of an off-road prototype suspension through such technique, using ground excitation history coming from field measurements and also by making use of a specific tool for obtaining dynamic loads from the model in question. The results shown at the end is key for future enhancements aiming mass reduction, for example, that may be executed on the prototype suspension system discussed here
