Fluid Flow
Mostrando 13-24 de 1025 artigos, teses e dissertações.
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13. Numerical study of upstream disturbances on the performance of electromagnetic and ultrasonic flowmeters
ABSTRACT Electromagnetic and ultrasonic flowmeters are high precision devices that can measure the water flow in pressurized irrigation networks. In these networks, the inadequate installation distance of flow control valves generates upstream disturbances which will increase measurement errors and reduce the accuracy of the equipment. Therefore, estimating
Sci. agric. (Piracicaba, Braz.). Publicado em: 04/11/2019
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14. Model of single-sized endotracheal tube for adults
RESUMO Objetivo Simular diferentes diâmetros de tubos endotraqueais e verificar os aspectos fluidinâmicos, considerando medições de fluxo e resistência. Métodos Foi utilizado um software de fluidinâmica para calcular o fluxo médio e a resistência das vias aéreas nos tubos endotraqueais com diâmetro de 6,0, 7,0, 7,5, 8,0, 9,0 e 10,0mm, em tempera
Einstein (São Paulo). Publicado em: 17/10/2019
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15. THERMAL PERFORMANCE OF ONE-PASS SHELL-AND-TUBE HEAT EXCHANGERS IN COUNTER-FLOW
Abstract A computational methodology is proposed and applied to calculate the temperature effectiveness, P, and the logarithmic mean temperature difference (LMTD) correction factor, F, of TEMA E shell-and-tube heat exchangers with one-pass and fluids flowing in counter-flow. An arbitrary number of baffles is considered along with three different mixture cond
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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16. ENERGETIC ANALYSIS OF AN ABSORPTION CHILLER USING NH3/LiNO3 AS AN ALTERNATIVE WORKING FLUID
Abstract This paper presents a thermodynamic model developed for a prototype absorption chiller using NH3/LiNO3 with 10 kW of nominal capacity. The study was undertaken using thermodynamic modeling based on the mass and energy balance, takes the overall heat transfer coefficients into consideration and uses the characteristic equation method. First, the resu
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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17. Simulação computacional de dispositivos de mistura em câmara de combustão para gases de carbonização
Resumo O carvão vegetal proveniente de florestas plantadas é uma fonte de energia renovável utilizada na siderurgia do Brasil, todavia, em sua produção há liberação do gás de pirólise, que pode ser considerado um gás com baixo poder calorífico inferior. A sustentabilidade da produção de carvão vegetal tem demandado a queima destes gases, poden
Ciênc. Florest.. Publicado em: 30/09/2019
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18. Atomization Characteristics of Droplet and Morphologies of Arc Sprayed Ni-Al Particles and Composition Coatings
Droplet atomization characteristics and its morphology in twin-wire arc sprayed (TWAS) Ni-Al were explored in depth. Both numerical model and theoretical method were built for calculating the process of the droplet deformation and breakup in air flow, which based on the standard k-ε model and the volume of fluid (VOF) dual-phase flow model. The atomization
Mat. Res.. Publicado em: 23/09/2019
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19. Aperfeiçoamento de modelo de estimativa da eficiência de remoção de turbidez da água em floculadores tubulares helicoidais
RESUMO Estudos científicos têm demonstrado que os floculadores tubulares helicoidais (FTHs) têm alta eficiência na formação de flocos e baixo tempo de retenção hidráulica, quando comparados aos floculadores comumente usados em tratamento de água e esgoto. No entanto, sua aplicação prática é limitada, pois ainda existe demanda significativa por
Eng. Sanit. Ambient.. Publicado em: 12/08/2019
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20. SEQUENTIAL PROCESSING OF Psidium guajava L. LEAVES: STEAM DISTILLATION AND SUPERCRITICAL FLUID EXTRACTION
ABSTRACT Extracts from the leaves of Psidium guajava L have been studied due to their importance as a source of natural antioxidant components with possible applications in the pharmaceutical and food industries. In this work, the sequential use of steam distillation and supercritical fluid extraction was studied to obtain the essential oil from the leaves a
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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21. EFFECT OF STEEL PLATE THICKNESSES AND FLUID FLOW CHARACTERISTICS OF AN IMPINGING AIR JET ON HEAT TRANSFER AT THE STAGNATION POINT
ABSTRACT The design and process of heat transfer elements, from its source to heat sink through various media vary according to the product and system concerned. The effect of thickness of a steel plate on heat transfer characteristics with an impinging air jet at the stagnation point was studied. Experiments were carried out with different nozzles, heights,
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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22. SIMULATION OF THERMAL DECOMPOSITION IN AN OPEN CAVITY: ENTROPY ANALYSIS
ABSTRACT This paper presents a numerical analysis of entropy generation in a two-dimensional rectangular channel where the inlet flow undergoes thermal decomposition resulting from a chemical reaction. The model considered viscosity and thermal conductivity to be dependent of temperature. Irreversibility due to mass transport was included in the entropy gene
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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23. Characterization of venturi injector using dimensional analysis
RESUMO Injetores Venturi são comumente empregados para fins de fertirrigação na agricultura, extraindo fertilizante de um tanque para a linha de irrigação. O conhecimento da quantidade de líquido a ser injetado por este dispositivo é útil para assegurar operação e manejo adequados da fertirrigação. Os objetivos desta pesquisa foram: (1) conduzir
Rev. bras. eng. agríc. ambient.. Publicado em: 10/07/2019
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24. 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