Prediction Of Flows
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Regional Frequency Analysis for the Prediction of Maximum Flows in Ungauged Basins of the Peruvian Amazon
Resumo A estimativa da vazão máxima de projeto e importante para o gerenciamento de inundações. No entanto, a existência limitada de sítios calibrados e a escassez de medições hidrológicas impossibilitam sua estimativa em bacias não calibradas. Neste estudo, a análise de frequência regional (RFA) foi realizada para a previsão de vazões máximas
Revista Brasileira de Meteorologia. Publicado em: 2022
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2. Wall function treatment for bubbly boundary layers at low void fractions
Abstract The present work investigates the role of different treatments of the lower boundary condition on the numerical prediction of bubbly flows. Two different wall function formulations are tested against experimental data obtained for bubbly boundary layers: (i) a new analytical solution derived through asymptotic techniques and (ii) the previous formul
An. Acad. Bras. Ciênc.. Publicado em: 2018-03
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3. The effect of the inner cylinder rotation on the fluid dynamics of non-Newtonian fluids in concentric and eccentric annuli
Helical flow in an annular space occurs during oil drilling operations. The correct prediction of flow of drilling fluid in an annular space between the wellbore wall and the drill pipe is essential to determine the variation in fluid pressure within the wellbore. This paper presents experimental and CFD simulation results of the pressure drop in the flow of
Braz. J. Chem. Eng.. Publicado em: 2014-12
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4. SIMULATION OF INTERMITTENT FLOW IN VERTICAL PIPES USING THE TWO-FLUID MODEL WITH DIFFERENT CLOSURE PARAMETERS / SIMULAÇÃO DO REGIME INTERMITENTE EM TUBULAÇÕES VERTICAIS UTILIZANDO O MODELO DE DOIS FLUIDOS COM DIFERENTES RELAÇÕES DE FECHAMENTO
Intermittent two phase flows are characterized by a succession of liquid slugs separated by bubbles of different sizes, with varying frequency. The prediction of this type of flow is very important, since it can be found in several industrial applications. In the present work, studies of intermittent flows in vertical pipes are performed, employing the Two F
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/09/2012
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5. Modelo de simulação em base horária da vazão na estação fluviométrica da régua-11 = : Simulation model in hourly basis of the flow at the fluviometric station R-11 / Simulation model in hourly basis of the flow at the fluviometric station R-11
The fluviometric station of rule 11, or simply R-11, is situated downstream from the confluence of the Paraná, Iguaçu, Acaray and Monday rivers, about 20 km away from Itaipu Hydroelectric Power Plant on the border between Brazil, Paraguay and Argentina. This region is subject to restrictions imposed by international agreements such as the implementation of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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6. AplicaÃÃo do MÃtodo das Isozonas na ObtenÃÃo das EquaÃÃes IDF de Chuvas Intensas dos MunicÃpios de Juazeiro do Norte, Barbalha e Crato - CE / Isozones Method applied in the obtention of the heavy rainfall IDF equations of the Juazeiro do Norte, Barbalha and Crato (CE) municipalities.
The increase in use of urban and rural land demands knowledge on statistically treated data on intensity, duration and frequency of heavy rainfall, allowing better forecasting of peak flow rates - used in the design of drainage networks. The damage caused by flooding of urban and rural areas are only avoided by well dimensioned drainage works, resulting in c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/11/2011
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7. Análise do modelo de mistura aplicado em escoamentos isotérmicos gás-líquido / Analysis of mixture model applied in gas-liquid isothermals flows
Gas-liquid flows are often found in nature as well as in various industrial applications. In the oil production, for example, in natural or artificial lift systems (continuous or intermittent gas-lift), gas and oil flow simultaneously in pipes. The prediction of gas-liquid behavior becomes necessary for technical and economic viability of many industrial pro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/07/2011
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8. Risk and Return in Brazilian Citrus Investment / Risco e retorno de investimento em citros no Brasil
The brazilian citrus industry has seen as a reasonably profitable business in the long term, but characterized by worrying level of risk. This study below aimed to evaluate the profitability and risk of this business, suggesting that the best to manage them is the provision of resources. Net Present Value - NPV was the method used to confront risk and return
Publicado em: 2010
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9. Aeroacoustics of dual-stream jets with application to turbofan engines.
A Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley s Equations, following the traditional MGBK method from NASA Lang
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/06/2009
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10. Análise e Comparação de Modelos de Previsão de Vazões para o Planejamento Energético, Utilizando Séries Temporais / Analysis and Comparison of Prediction Models for Energy Planning Flows, Using Time Series
No planejamento da operação energética, a análise e previsão de vazões são muito importantes. Uma grande dificuldade na previsão de vazões é a presença da sazonalidade, devido aos períodos de seca e cheia no ano. Muitos estudiosos, com metodologias diversas, têm se preocupado em encontrar um modelo de melhor ajuste, em comparação ao utilizado
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/01/2009
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11. Aeroacoustics of dual-stream jets with application to turbofan engines.
A Computational Aeroacoustics (CAA) and a novel semi-empirical model is developed for predicting the noise generated by the jet flow through dual stream (coaxial) nozzles, as found in modern turbofan engines. The acoustic source model was developed in a 2D and 3D framework, based on the Lilley s Equations, following the traditional MGBK method from NASA Lang
Publicado em: 2009
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12. Análise e Comparação de Modelos de Previsão de Vazões para o Planejamento Energético, Utilizando Séries Temporais / Analysis and Comparison of Prediction Models for Energy Planning Flows, Using Time Series
No planejamento da operação energética, a análise e previsão de vazões são muito importantes. Uma grande dificuldade na previsão de vazões é a presença da sazonalidade, devido aos períodos de seca e cheia no ano. Muitos estudiosos, com metodologias diversas, têm se preocupado em encontrar um modelo de melhor ajuste, em comparação ao utilizado
Publicado em: 2009