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Publications (43)
Chemical enhanced oil recovery (EOR) methods return produced water containing polymers and surfactants which poses a water treatment challenge at offshore facilities. The present work shows that numerical simulations of gas‐water systems containing these chemicals remain challenging. Computational fluid dynamics (CFD) was used to predict gas holdup...
The usage of flow-diverting stents in the treatment of intracranial aneurysms is widespread due to their high success and low complication rates. However, their use is still not officially recommended for bifurcation aneurysms, as there is a risk of generating ischemic complications due to the reduced blood flow to the jailed branch. Many works uti...
The increase in natural gas production in the area known as the presalt of the Santos Basin, associated with high concentrations of CO2 (up to 80% molar) in the east margin offshore Brazil, has motivated the use of compact technologies, such as supersonic separators, for the treatment of natural gas, with the aim of reducing production costs. Super...
The usage of flow-diverting stents in the treatment of intracranial aneurysms is widespread due to their high success and low complication rates. However, their use is still not officially recommended for bifurcation aneurysms, as there is a risk of generating ischemic complications due to the reduced blood flow to the jailed branch. Many works uti...
Liquid film flows are characterized by a well-defined interface between gas and liquid film flows. A two-dimensional liquid film approach which assumes a very thin film and consists of computing its thickness instead of solving the film flow region is used. The liquidFilmFoam solver of the CFD code FOAM-extend 4.0 has been used to compute film thic...
Chemical enhanced oil recovery (EOR) methods are alternatives to increase oil production in mature reservoirs. However, the presence of EOR chemicals in the produced water may impact the separation of gas-water systems in oil platforms. The present work aims to evaluate the impact of polymers, surfactants, inorganic salts, and their interactions on...
Hydrocyclones are widely used in industry and CFD has been used to compute them. Reynolds stress turbulence models (RSM), which are computationally costly and oftentimes hard to converge, are often recommended in these computations. The present work has selected a liquid-liquid separation hydrocyclone for which single-phase experimental tangential...
Numerous studies have reported the so-called fish-hook effect on granulometric efficiency curves of hydrocyclones. This effect has been reported since laser diffraction particle size analysers started to be used. In this work a 15-mm-diameter Bradley hydrocyclone has been used to separate a suspension of calcium carbonate 1,2% in volume to analyse...
Production separators for gas-oil-water separation are huge, require long residence times, and present several internals to improve oil-water separation. As an alternative to production separators, specially for subsea facilities, this work presents a hydrocyclone which separates a 40% oil-in-water mixture with 93% ± 2% total efficiency and flow ra...
Chemical Enhanced Oil Recovery (EOR) can boost oil extraction in offshore operations, however one of the main concerns regarding its application is how the efficiency of flotation units for treating produced water is affected. The present work thus focuses on investigating the impact of EOR chemicals on the physical properties of EOR effluents and...
Neste trabalho, desenvolveu-se um hidrociclone para a separação de gotas de água dispersas em óleo. Para tanto, realizaram-se simulações de CFD em conjunto com a técnica de DCCR. No estudo realizado, simulações CFD de nove modelos relativos a combinações de diâmetros de overflow e underflow foram conduzidas, fixando-se a concentração de água em 10%...
Multiple-time-scale models have been recently studied by the authors with focus on predicting non-equilibrium flows. Two two-time-scale linear-eddy-viscosity models have been further developed, improved and tested over a wide range of test cases, including simple flows, such as channel flows and zero pressure gradient boundary layers, and more comp...
This work presents an analysis of the shell side flow in a shell and tube heat exchanger using Computational Fluid Dynamics (CFD). The heat exchanger has been designed with the software HTRI Xchanger Suite®, while CFD simulations have been performed with the computational package ANSYS Fluent 15.0. Both k-ε and SST turbulence models have been asses...
Poster exposed at the XXI Brazilian Congress of Chemical Engineering (September/2016).
RESUMO – O escoamento ar/água em um dispositivo de contato tipo bandeja perfurada foi modelado com o auxílio do software de fluidodinâmica computacional ANSYS CFX 15 ®. A abordagem Euleriana foi empregada, sendo o ar e a água assumidos como fases interpenetrantes. A expressão utilizada para a determinação do coeficiente de arraste em torres de borb...
A previsão da hidráulica de bandejas valvuladas encontradas em torres da Refinaria Duque de Caxias, da Petrobras, no Rio de Janeiro, foi realizada com o auxílio do software de fluidodinâmica computacional ANSYS CFX 15® e utilizando um modelo com geometria simplificada e metodologia de simulação já consolidada para o escoamento ar/água. Os resultado...
The performance of thirteen benchmark turbulence models within the RANS framework has been assessed in classical non-equilibrium flows. Linear and non-linear eddy-viscosity schemes, Reynolds stress transport models and single- and two-time-scale approaches have been considered in the investigation. Among the test cases studied are homogeneous shear...
