Annular Flow
Mostrando 1-12 de 63 artigos, teses e dissertações.
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1. MODELING AND ANALYSIS OF UNSTEADY FLOW BEHAVIOR IN DEEPWATER CONTROLLED MUD-CAP DRILLING
Abstract A new mathematical model was developed in this study to simulate the unsteady flow in controlled mud-cap drilling systems. The model can predict the time-dependent flow inside the drill string and annulus after a circulation break. This model consists of the continuity and momentum equations solved using the explicit Euler method. The model consider
Braz. J. Chem. Eng.. Publicado em: 2016-03
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2. Influence of flow pattern development at die entrance and inside annular die on extrudate swell behavior of NR compound
Abstract This research studies influence of the flow pattern at annular die entrance through the inside of annular die flow channel of capillary rheometer on the swell behavior of NR compound. The annular die used in this research was specifically designed to create the specific pattern of Vortex Flow at Die Entrance (VFE) of NR compound. Results of the stud
Polímeros. Publicado em: 2015-10
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3. Modeling the nanofiber fabrication with the melt blowing annular die
Melt blowing is commonly used to convert polymer resin directly into nonwoven fabrics of superfine fibers. Further decrease of the fiber diameter will improve the filtration and adsorption properties remarkably and thus has been appealing to the researchers. Besides the dual slot die, the annular die is utilized to manufacture superfine fibers in the melt bl
Matéria (Rio J.). Publicado em: 2014-12
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4. The effect of the inner cylinder rotation on the fluid dynamics of non-Newtonian fluids in concentric and eccentric annuli
Helical flow in an annular space occurs during oil drilling operations. The correct prediction of flow of drilling fluid in an annular space between the wellbore wall and the drill pipe is essential to determine the variation in fluid pressure within the wellbore. This paper presents experimental and CFD simulation results of the pressure drop in the flow of
Braz. J. Chem. Eng.. Publicado em: 2014-12
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5. Flow visualization & extrudate swell behavior of natural rubber compound in annular die capillary rheometer
This research aims to study the flow pattern and extrudate swell properties of a Natural Rubber (NR) compound in a constant shear rate capillary rheometer, using two types of annular die: convergent annular and divergent annular. Results revealed that flow patterns that occurred in the barrels of both types of annular dies were significantly different, espec
Polímeros. Publicado em: 2014-08
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6. Influência da geometria da nanocarga na estruturação, orientação e propriedades de filmes tubulares de nanocompósitos de PA6 / Influence of the nanoparticles shape on the structure, orientation and properties of pa6 nanocomposites blown films
The structure and morphology of polymers and consequently their properties are dependent on the processing conditions. During the blown film process, high shear and elongational flows can induce a preferred orientation of the polymer chains; controlling the process conditions, it is possible to obtain films with anisotropic properties. Polymeric nanocomposit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/06/2012
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7. Prediction of the temperature distribution of partially submersed umbilical cables
The objective of this work is to predict the temperature distribution of partially submersed umbilical cables under different operating and environmental conditions. The commercial code Fluent® was used to simulate the heat transfer and the air fluid flow of part of a vertical umbilical cable near the air-water interface. A free-convective three-dimensional
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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8. Modelagem matemática e simulação de escoamentos em canais anulares com interação fluido-estrutura / Mathematical modeling and simulation of flow in annular channels with fluid-structure interaction
O objetivo deste trabalho é de dar continuidade ao desenvolvimento de uma plataforma numérica em canais anulares, problemas presentes em engenharia de perfuração e da indústria de gás e petróleo. A plataforma numérica, desenvolvida utilizando o método de discretização dos volumes finitos, emprega métodos e esquemas de segunda ordem. A utilizaçã
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011
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9. Project, development and testing In vitro of new model pump for cardiopulmonary bypass : spiral pump / Projeto, desenvolvimento e ensaios "In Vitro" de novo modelo de bomba de sangue para circulação extracorpórea : bomba espiral
A model of blood pump has been developed, the Spiral Pump. This pump has an internal rotor, a conically shaped fuse, containing threads with double entrance on its surface. This rotor is supported by two bearings assembled at a stainless steel shaft, fixed to the housing´s base. The rotation of the conical fuse is generated by magnetic coupling to a motor,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2010
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10. Desenvolvimento de uma técnica de medida de vazão de óleo em escoamento bifásico do tipo core-flow / Development of a technique for measuring the oil flow rate in core-annular flow pattern
Diferentes métodos para exploração dos óleos pesados surgiram nestes últimos anos. Um método que chamou a atenção da indústria foi o método que adiciona água ao escoamento, formando uma película lubrificante que facilita o escoamento deste óleo que pode escoar em diferentes padrões. O padrão considerado mais eficiente em relação à potencia
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2010
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11. Experimental investigation of the liquid volumetric mass transfer coefficient for upward gas-liquid two-phase flow in rectangular microchannels
The gas-liquid two-phase mass transfer process in microchannels is complicated due to the special dynamical characteristics. In this work, a novel method was explored to measure the liquid side volumetric mass transfer coefficient kLa. Pressure transducers were utilized to measure the pressure variation of upward gas-liquid two-phase flow in three vertical r
Brazilian Journal of Chemical Engineering. Publicado em: 2010-12
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12. Contribution to the study of a non-invasive probe for measuring the water thickness in a core-annular flow / Contribuição ao estudo de um medidor não-invasivo da espessura da camada de agua em um escoamento anular oleo-agua
This work is a contribution to the study of a non-intrusive probe for measurement of the thickness of the water layer of a core-annular flow. A capacitive probe was built and its static performance was evaluated from tests executed in a specially designed bench-scale apparatus. In addition, evaluation of the dynamic performance was made possible from fluid-f
Publicado em: 2010