Experimental Analysis of Two-Phase Slug Flow Evolution With a Slight Upward Direction Change

Barros, Hedilberto; Andrade, Camilla Verbiski; Czelusniak, Fernando; Alves, Rafael Fabricio; Cozin, Cristiane; Neto, Moisés Marcelino; Morales, Rigoberto E. M.

doi:10.26678/abcm.cobem2019.cob2019-1166

Cited by 1 publication

(4 citation statements)

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“…The main goal of this work is to analyze data from an experimental study developed by Barros et al (2019) to evaluate the detailed evolution of characteristic hydrodynamic parameters of a two-phase air-water slug flow in horizontal tubes, as well as to provide a novel methodology to retrieve data from a moving reference frame (Lagrangian referential).…”

Section: Objectivesmentioning

confidence: 99%

“…The methodology applied to this research aims to answer to specific objectives: acquiring hydrodynamic parameters -such as bubble and slug length -and to fit statistical distributions to the obtained data. Data was retrieved by Barros et al (2019) using an experimental circuit of 35m long and 0,026m diameter at NUEM experimental facilities. The circuit is divided in two main sections: the test section -made of acrylic in order to visualize the flow -and the return pipeline, which aims to recirculate the liquid used in the study.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…7. Source: adapted from Barros et al (2019) The experimental loop has five measuring stations -positioned at 390D, 538D, 615D, 807D and 1154D -equipped with two-wire sensors and pressure transducers. Twowire sensors measure the liquid height in order to acquire the void fraction time series and the pressure is recorded in order to fix gas superficial velocity due to gas expansion.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Both fluids are mixed using a parallel plate device in order to promote stratified flow at the tube entrance, as stratified flow tends to quickly develop to slug flow. Details of the experimental procedure and uncertainties are found in Barros et al (2019).…”

Section: Experimental Apparatusmentioning

confidence: 99%

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Horizontal Air-Water Two Phase Slug Flow: Eulerian and Lagrangian Data Analysis

Chiarello¹,

Barros²,

Neto³

et al. 2020

Procceedings of the 18th Brazilian Congress of Thermal Sciences and Engineering

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Multiphase flows are recurrent phenomena both in natural environments-such as volcanic eruptions and blood flow through veins-and industrial environments-such as the nuclear and petroleum industries. Knowledge about the hydrodynamics of the flow as well as its evolution across the pipeline is essential to correctly design pipelines, equipments (such as pumps and slug catchers) and to formulate strategies to optimize the crude oil exploitation from reservoirs. A frequently reported flow pattern in oil pipelines is slug flow, reason why the present study focuses in its investigation. In order to analyze the flow, a novel methodology is proposed and applied to data retrieved in Multiphase Flow Center (NUEM) experimental facilities. The experimental loop has a length of 35.6 m and 26 mm internal diameter and was operated under 18 different slug flow conditionsvarying gas superficial velocity from 0.3 to 2.5 m/s and liquid superficial velocity from 0.3 to 3.0 m/s-across 5 different measuring stations composed by a pair of two-wire resistive sensors distributed along the pipe. Data was analyzed using Eulerian reference frame (ERF), which provides distributions for each hydrodynamic parameter in each measuring station for every experimental point, and Lagrangian reference frame (LaRF), which follows unit cells across the pipeline in order to evaluate the change in hydrodynamic parameters of single structures. Correlations were proposed based on retrieved results for hydrodynamic parameters average values and standard deviation. Moreover, a comparison against previous works was made in order to test the presented correlations as well as to propose corrections to the existing ones. Furthermore, details of the flow were investigated using the developed methodology, which was able to provide additional and insightful information about the flow behavior-such as the intrinsically unsteady nature of slug flow, as slug lengths were found to oscillate at all times, even though average values did not report significant changes, which would indicate developed flow conditions. Moreover, it was shown that gas expansion is a driver phenomenon in heavily aerated points, but becomes lees pronounced in low aeration flows-such as plug flows.

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Section: Objectivesmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

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