Two Phase Vertical Flow
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. 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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14. Forma da interface e gradiente de pressão no padrão liquido-liquido anular vertical ascendente
This investigation describes the upward vertical annular two-phase flow for application on heavy oil production. One of the main problems concerning the exploitation of this kind of crude is the huge friction pressure gradient involved. The technology that has been studied for the very viscous fluid transportation consists in the continuous injection of litt
Publicado em: 2002
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15. Emprego de diferentes estrategias para analises em larga escala : screening, extração ultra-sonica e pre-concentração por ponto nuvem
This thesis proposes three different procedures to simplify chemical analyses, mostly minimizing time and costs. In the first part, it was developed a screening system to detection of phenothiazines in human urine. A spectrophotometric method based on the reaction of the drugs with K3Fe(CN)6 in acid medium was proposed. The flow system was optimized and the
Publicado em: 2002
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16. Estudo experimental e caracterização estatistica da hidrodinamica do escoamento bifasico vertical ascendente em padrão pistonado / Study and statistical characterisation of the fluid dynamics of vertical upward two-phase slug flow
Foi desenvolvido projeto experimental com objetivo de estudar a fluidodinâmica do fluxo vertical bifásico em padrão pistonado, utilizando a técnica da sonda de fios paralelos. Parâmetros importantes para a caracterização do fluxo, como a frequência, velocidade e comprimento de golfadas de líquido, a espessura de filme descendente e a fração de vaz
Publicado em: 1997
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17. Modelo computacional dinamico lagrangeano - euleriano para escoamento bifasico em poços de petroleo
A new computational model is introduced for describing long-term transient aspects of two-phase vertical flow, focusing the convection phenomenon only. The model uses the concepts ofthe drift-flux model along with specific constitutive relations for bubble, slug and annular flow. The motion of gas is treated with Lagrangean cells, whereas mass and momentum c
Publicado em: 1996
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18. Simulação numerica de escoamento bifasicos a bolhas e pistonado usando um metodo Euleriano-Lagrangeano
A model to predict the behaviour of vertical two-phase flow regimes, such as bubbles and slug flow has been proposed, using a Lagrangian representation of the discrete phase and a Eulerian representation of the continuous phase. Each bubble is modeled individually through three equations: the mass and the momentum balance equations and the bubble position eq
Publicado em: 1993
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19. Simulação numerica da separação de um escoamento bifasico gas-liquido em um te
The main objective of this work is to study the phase separation phenomena in a vertical tee. A two-dimensional computer code was used to solve the two-fluid model equations, using the finite volume method. A fundamental part is the development of simple model to viscous diffusion term, assuming laminar flow. Special attention is directed to the modelling of
Publicado em: 1991
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20. Medida de fração de vazio superficial num escoamento bifoisico gas-liquido pelatecnica de atenuação de raios gama
The evaluation of void fraction in gas liquid two-phase flow is essential for a through understanding of the fluid hydrodynamics associated tothe multiphase flow. Many void fraction measurement techniques have been developed, and those already known have been improved, so that the goal of measuring them faster and more acurately may be attained. The present
Publicado em: 1989