Two Phase Flow Mathematical Models
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Mathematical modeling of supercritical fluid extraction of oil from canola and sesame seeds
Mathematical modeling of supercritical fluid extraction of oil from canola and sesame seeds with a two-phase model was performed in this work. A model based on differential mass balance was used to correlate the experimental data. Different adsorption isotherm models (Henry, Freundlich and Brunauer, Emmet and Teller (BET)) were used to describe the equilibri
Braz. J. Chem. Eng.. Publicado em: 2013-03
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2. Investigação do escoamento bifásico gás-líquido em uma coluna de bolhas retangular por meio da técnica CFD / Investigation of two-phase gas-liquid flow in a rectangular bubble column using CFD technique
This study aims to evaluate the main forces which act in gas-liquid flow in a rectangular bubble column of dimensions 150cm x 26;4cm x 3;1cm (height (H) x width (W) x depth (D)), with centralized aeration, using CFD technique. The proposed case is based in a experimental study of an air-water system operating in homogeneous bubbly flow, with initial liquid h
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/12/2011
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3. 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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4. Modelagem dinâmica de separador bifásico com alimentação por escoamento em regime de golfadas / Dynamic modeling of two-phase separator with feeding for draining in regimen of slug
O presente trabalho aborda o comportamento da planta de processamento primário com alimentação por fluxo em padrão de golfadas. O fluxo no sistema de tubulações é descrito por um modelo de parâmetros concentrados, fornecendo as características principais necessárias para o controle da planta, e a resposta dinâmica desta pode então ser analisada.
Publicado em: 2008
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5. Computational modeling of two and three-phase flow in heterogeneous petroleum reservoirs / Modelagem computacional de escoamentos com duas e três fases em reservatórios petrolíferos heterogêneos
Considera-se neste trabalho um modelo matemático para escoamentos com duas e três fases em reservatórios petrolíferos e a modelagem computacional do sistema de equações governantes para a sua solução numérica. Os fluidos são imiscíveis e incompressíveis e as heterogeneidades da rocha reservatório são modeladas estocasticamente. Além disso, é
Publicado em: 2008
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6. Um sistema para estimação da vazão de gás de poços produzindo por Plunger Lift para vaso separador de teste em plataformas de petróleo
This work intends to analyze the behavior of the gas flow of plunger lift wells producing to well testing separators in offshore production platforms to aim a technical procedure to estimate the gas flow during the slug production period. The motivation for this work appeared from the expectation of some wells equipped with plunger lift method by PETROBRAS i
Publicado em: 2007
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7. Methods for transport equations with random data / Metodos para equações do transporte com dados aleatorios
Mathematical models for real-world processes often take the form of systems of artial differential equations. Such models usually involve certain parameters, for example, the coefficients in the differential operator, and the initial and boundary conditions. Usually, all the model parameters are assumed to be known exactly. However, in realistic situations m
Publicado em: 2007
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8. Multidimensional modelling and calculation of combustion in porous media
In contrast with household heating systems based on open combustion flames, burners based on premixed combustion in inert porous media are characterized by higher thermal efficiency and high turndown ratio allied with compacity of the units. Moreover, porous burners, where a flame is anchored inside a porous matrix, are associated with low pollutants formati
Publicado em: 2005
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9. 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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10. Obtenção de extrato de alecrim (Rosmarinus officinalis) por extração supercritica : determinação do rendimento global, de parametros cineticos e de equilibrio e outras variaveis do processo. / Recovery of the extract from rosemary (Rosmarinus officinalis) by supercritical extraction : determination of the global yield, kinetic and equilibrium parameters and other process variables.
In this work the supercritical extraction from rosemary (Rosmarinus officinalis) using CO2 as solvent was studied, for the determination of the global yield isotherms, overall extraction curves and antioxidant activity. The phase equilibrium for the system rosemary + CO2 was studied. For the global yield isotherms the parameters studied were: pressure and te
Publicado em: 2004
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11. 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