Hydraulic Transient
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Hydrostatic Equilibrium between Soil Samples and Pressure Plates Used in Soil Water Retention Determination: Consequences of a Questionable Assumption
ABSTRACT Soil water retention is among the soil hydraulic properties most routinely measured in studies of soil physics and related areas. This property is used in dynamic simulations of vadose zone processes such as soil water availability, surface boundary processes of evaporation and infiltration, and the fate of soil pollutants. The most common measureme
Rev. Bras. Ciênc. Solo. Publicado em: 29/07/2019
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2. Vibration control device for steel tubular towers of Horizontal Axis Wind Turbines
Abstract This paper presents and discusses the design of a vibration control device for a 120 m high steel tubular tower of onshore Horizontal Axis Wind Turbine (HAWT). The tower is modeled using beam (own code), and shell and solid finite elements (via ANSYS). The Dynamic Vibration Absorber (DVA) is designed to be attached to the tower top, aiming to analyz
Lat. Am. j. solids struct.. Publicado em: 10/07/2019
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3. Modeling and hydraulic performance evaluation of a dripper device coupled to a branched water distribution network
Resumo A irrigação é responsável por aproximadamente 70% do consumo de água doce do mundo e é um dos principais fatores por trás da crescente escassez de água global. As técnicas e sistemas de irrigação são extremamente diferenciadas e complexas. Neste contexto, as ferramentas de dinâmica de fluidos computacional (CFD) ganham relevância, permit
Rev. Ambient. Água. Publicado em: 03/06/2019
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4. Performance evaluation of different soil water retention functions for modeling of water flow under transient condition
ABSTRACT ABSTRACT: Description and prediction of water flow through unsaturated soils is necessary to understand their hydraulic properties, including soil water retention curve (SWRC). Many models have been developed for estimation of SWRC and many researchers compared water retention curve derived from these models with the measured values. In this paper,
Bragantia. Publicado em: 17/01/2019
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5. Modelagem Computacional de Efeitos DinÃmicos de DissipaÃÃo de Energia em Transientes HidrÃulicos / Computational Modeling of Dynamic Effects of Energy Dissipation in Hydraulic Transients
Elevados nÃveis de pressÃo provocados pelo desligamento de bombas sÃo responsÃveis pelo elevado Ãndice de danos estruturais em adutoras. Um controle efetivo destas perdas requer um melhor dimensionamento do sistema ou dos dispositivos de atenuaÃÃo do golpe de arÃete. Esse ajuste depende das formulaÃÃes propostas para as equaÃÃes de continuidade e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/01/2011
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6. MODELAGEM COMPUTACIONAL DA VÃLVULA ANTECIPADORA DE ONDA COMO MECANISMO DE ALÃVIO PARA O GOLPE DE ARÃETE / COMPUTATIONAL MODELING OF ANTICIPATION VALVE OF WAVE AS A MECHANISM OF RELIEF FOR WATER HAMMER
Neste trabalho foram realizadas simulaÃÃes do transiente hidrÃulico com vÃlvula antecipadora de onda com abertura e fechamento completo e nÃo instantÃneo, como mecanismo de alÃvio para o golpe de arÃete. A vÃlvula deve situar-se prÃximo ao conjunto motor-bomba. Assim, a vÃlvula antecipadora serà aplicada ao segundo nà das adutoras consideradas,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/05/2010
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7. MODELO HIDRÁULICO BASEADO NO MÉTODO DAS CARACTERÍSTICAS E ALGORITMOS GENÉTICOS PARA OTIMIZAÇÃO DA OPERAÇÃO DE REDES DE ABASTECIMENTO DE ÁGUA E DE ESTAÇÕES DE BOMBEAMENTO
A hydraulic model was developed for simulation of water supply networks using the Method of Characteristics (MOC), introducing new features to the CALHIDREDMT model, proposed by Righetto (1994). The model uses the concept of pseudo-transient, using a fictitious value for the wave celerity. Simulations were performed in networks equipped with reservoirs, tank
Publicado em: 2010
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8. CalibraÃÃo de Rugosidade de TubulaÃÃes de Redes de DistribuiÃÃo de Ãgua, Via MÃtodo Transiente Inverso com AplicaÃÃo de Algoritmo GenÃtico / Roughness pipe calibration in a water distribution network with Genetic Algorithm and Inverse Transient Analysis
An important step in the modelling of hydraulic networks, calibration makes it possible to predict the behavior of physical parameters essential to decision-making. The present study used inverse transient analysis with a genetic algorithm to calibrate pipe roughness in a water distribution network with simulations based on variable parameters such as mutati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/09/2009
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9. MODELING OF THE USE OF NANOFLUIDS IN INTERNAL COMBUSTION ENGINES COOLING SYSTEMS / MODELAGEM DO USO DE NANOFLUIDOS NO SISTEMA DE ARREFECIMENTO DE MOTORES A COMBUSTÃO INTERNA
The application of nanofluids in cooling systems of internal combustion engines was studied. Nanofluids consist of nanoparticles (with dimension below 100 (u)m) suspended in traditional heat transfer fluids, such as water or ethylene glycol. Given their favourable heat transfer characteristics, because of the suspension of high thermal conductivity particles
Publicado em: 2009
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10. NUMERICAL MODELLING OF INFILTRATION OF HYDROCARBONS IN UNSATURATED SOILS USING THE FINITE VOLUME METHOD / MODELAGEM NUMÉRICA DA INFILTRAÇÃO DE HIDROCARBONETOS EM SOLOS NÃO SATURADOS UTILIZANDO O MÉTODO DE VOLUMES FINITOS
A large proportion of the population depends on groundwater for consumption. Thus, leakage of gasoline tanks represents a significant risk to public health besides the risk of fire and explosion in the sewer lines, due to the flammable gases. These tanks are generally located in the unsaturad soil above the groundwater level. It is therefore important to eva
Publicado em: 2009
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11. New solution for the problem of air dissolution in hydropneumatic reservoir. / Nova solução para o problema da dissolução de ar em reservatório hidropneumático.
This work proposes to present a new solution for the problem of the air dissolution in hydropneumatic reservoir. In the introductory chapter are presented information and characteristics about hydropneumatic reservoir, mainly the ones related to his operation. In this chapter it is commented about the main solutions used to overcome the problem of the air di
Publicado em: 2009
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12. Sistema de identificação e classificação de transientes em reatores nucleares / NUCLEAR REACTORS TRANSIENTS IDENTIFICATION AND CLASSIFICATION SYSTEM
This work describes the study and test of a system capable to identify and classify transients in thermo-hydraulic systems, using a neural network technique of the self-organizing maps (SOM) type, with the objective of implanting it on the new generations of nuclear reactors. The technique developed in this work consists on the use of multiple networks to do
Publicado em: 2008