Three Dimensional Circulation
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Three-dimensional simulation of liquid flow on a sieve tray under different inclinations
The fluid state on a sieve tray will change when the towers tilt under wind loads. A computational fluid dynamics (CFD) model was used to predict the flow patters and hydraulics on the tray under different inclinations. The gas and liquid phases are modelled with the volume-of-fluid (VOF) framework as two inmiscible phases. Several three-dimensional transien
Braz. J. Chem. Eng.. Publicado em: 2014-12
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2. Hidrodinâmica e transferência de oxigênio em três biorreatores Airlift de circulação interna geometricamente semelhantes
Internal-loop airlift reactors (ALR) are a special class of pneumatic reactors. The use of this type of reactor has been attractive for chemical and biological reactions because of their simple construction without moving parts and low energy costs when compared with stirred tank reactors. In the present work, a study related to hydrodynamic and oxygen trans
Publicado em: 2009
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3. Measurements of placental volume and vascular indices by three-dimensional ultrasound power Doppler in normal pregnancies / Mensuração do volume e quantificação dos índices vasculares placentários pela ultra-sonografia tridimensional com power Doppler em gestações normais
Objectives: The purpose of this study was to construct normograms of placental volume and placental vascular indices in normal gestations according to gestational age and fetal weight by three dimensional ultrasound power Doppler. Methods: A study was performed with 280 normal pregnant women presenting 12 to 38 weeks of pregnancy, during the period between M
Publicado em: 2008
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4. Avaliação da Limpidez do Aço Líquido Através da Modelagem Matemática do Desgaseificador RH da Companhia Siderúrgica de Tubarão - CST
In order to comply with an increasing market for high quality steels, specially steels for automobile applications, CST Companhia Siderúrgica de Tubarão has acquired in 1998 its RH degasification unit. As a production expansion up to 7.5 million tons of crude steel per year is scheduled, a 2nd RH unit has been commissioned. The RH process is based upon the
Publicado em: 2006
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5. "Experimentos e modelagem numérica com aplicação ao Estuário Tropical do Rio Curimataú, RN" / Experiments and numerical model with application to the tropical estuary of the Catimataú river, RN
The distribution and variability of the termohaline properties and the three-dimensional circulation of the Curimataú river estuary had been studied with the application of the numerical model of simulations Delft3D-Flow, validated with experimental data measured during two consecutive cycles of neap and spring tide. Two numerical grids were applied with th
Publicado em: 2006
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6. Use of a 3D Mathematical Model in Water Quality Management Billings Reservoir´s case / Utilização de modelagem matemática 3D na gestão da qualidade da água em mananciais - aplicação no Reservatório Billings
Mathematical modeling has proved to be an extremely useful technique in forecasting water quality. Because of different hydrometeorological conditions and the different ways in which land is used and existing infrastructure is managed, there is considerable variation in the volume and type of pollutant flowing into the receptor bodies. This has implications
Publicado em: 2006
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7. Evolutionary behavior of dispersal process of produced water resultant from offshore : numerical treatment and computational / Comportamento evolutivo de descarga de agua de produção decorrente de atividade offshore : tratamento numerico e simulação computacional
In this work we study the evolutionary behavior of dispersal process of produced water resultant from off-shore activities, using a system of the classic partial differen-tial equations to mo deI both a circulation map as well as diffusion and advection in a three-dimensional domain. An existence and uniqueness result is obtained in the studied case, where f
Publicado em: 2005
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8. Modelagem fenomenologica e simulação bidimensional de ciclones por tecnicas da fluidodinamica computacional
This work presents a mathematical modeling based on the principIes of mass and momentum conservation with the volumetric average point of view, and generalized to represent the multiphase flow in cyclones. It also discusses the hypotheses necessary for flutuating properties treatment, due to Reynolds decomposition applied as statistical treatment of the turb
Publicado em: 1998
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9. Chip-based Three-dimensional Cell Culture in Perfused Micro-bioreactors
We have developed a chip-based cell culture system for the three-dimensional cultivation of cells. The chip is typically manufactured from non-biodegradable polymers, e.g., polycarbonate or polymethyl methacrylate by micro injection molding, micro hot embossing or micro thermoforming. But, it can also be manufactured from bio-degradable polymers. Its overall
MyJove Corporation.
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10. Sustained vortex-like waves in normal isolated ventricular muscle.
Sustained reentrant excitation may be initiated in small (20 x 20 x less than 0.6 mm) preparations of normal ventricular muscle. A single appropriately timed premature electrical stimulus applied perpendicularly to the wake of a propagating quasiplanar wavefront gives rise to circulation of self-sustaining excitation waves, which pivot at high frequency (5-7
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11. Mantle dynamics and seismic tomography
Three-dimensional imaging of the Earth's interior, called seismic tomography, has achieved breakthrough advances in the last two decades, revealing fundamental geodynamical processes throughout the Earth's mantle and core. Convective circulation of the entire mantle is taking place, with subducted oceanic lithosphere sinking into the lower mantle, overc
The National Academy of Sciences.
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12. Mechanism of late stroke after myocardial infarct: the Lausanne Stroke Registry.
To assess the potential mechanisms and patterns of late stroke after myocardial infarct, 94 consecutive patients with first ever stroke at least three months after myocardial infarction (anterior 67%; inferior 12%; widespread 12%) were studied. Systematic investigations were those of the Lausanne Stroke Registry and included brain CT, extra/transcranial Dopp