Algebraic Model Of Turbulence
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Heat and mass transfer in two-phase flow around airfoils with aeronautical anti-ice systems. / Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos.
It is required to prevent ice accretion on wings and horizontal stabilizers because it may cause aerodynamic performance degradation, weight increase, flight control difficulties and, in critical cases, may lead to operational safety margins reduction. When aircraft flies through clouds containnig supercooled water droplets, which are in metastable equilibri
Publicado em: 2009
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2. Numerical simulation of the transport of the properties during the wadding of compartments of reservoirs / Simulação numérica do transporte das propriedades durante o enchimento de compartimentos de reservatórios
The wadding of hidroelectric reservoirs provokes ambient impacts, intervening with the ecosystems and the ways of life of the involved populations, because during this process the terrestrial biomass is decomposed launching substances that stay concentrated in the volumes of the different compartments of the reservoir. In these conditions, some regions of th
Publicado em: 2007
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3. The phase distribution of upward co-current bubbly flows in a vertical square channel
In this work one shows experimental data and numerical results of the void fraction distribution in vertical upward air-water bubbly flows in a square cross-section channel. To measure the void fraction distribution one used a single wire conductive probe. The averaged void fraction ranged from 3.3% to 15%; the liquid and the gas superficial velocities varie
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-09
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4. Distribuição de fases de escoamento a bolhas em duto de secção quadrada atraves de curva de 180º no plano vertical / Phase segregation in bubbly flow in square section duct inside a 180 degree vertical plan curve
The phase segregation in gas-liquid bubbly flow taking place inside a 180 degree plane curve, i.e., with null torsion, is the subject of this work. Both experimental and numerical approaches have been performed. Thus, aspects as the influence of intensity of centrifugal field on phase segregation, the role played by turbulence on phase segregation and detail
Publicado em: 2004
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5. Application of a non isotropic turbulence model to stable atmospheric flows and dispersion over 3D topography
A non isotropic turbulence model is extended and applied to three dimensional stably stratified flows and dispersion calculations. The model is derived from the algebraic stress model (including wall proximity effects), but it retains the simplicity of the "eddy viscosity" concept of first order models. The "modified k-epsilon" is implemented in a three dime
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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6. Modelagem do aquecimento de fluidos com escoamento em tubos
This study considers the modeling of laminar and turbulent flows with conjugated transference of heat in tubes of cylindrical section. Instead of using the convetional finite element or finite volume methods, this formulation applies a different technique discretizing the flow in the radial direction using a 4th order finite differences method. Using this te
Publicado em: 2000
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7. 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