Capacitance wire mesh imaging of bubbly flows for offshore treatment applications

Assima, Gnouyaro P.; Larachi, Faı̈çal; Schleicher, Eckhard; Schubert, Markus

doi:10.1016/j.flowmeasinst.2015.07.012

Cited by 13 publications

(19 citation statements)

References 26 publications

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“…Bubble columns have wide applications either in the simplest forms, to purely mix the liquid phases, or in further complicated forms, to transfer chemical species from one phase to another phase. They are widely exploited especially in chemical processes such as petroleum residues conversion, hydrotreating, Fischer–Tropsch synthesis, coal liquefaction, hydrogenation, wastewater treatment, etc. , Hence, bubble column reactors are also envisaged in offshore fuel processing and gas treatment applications . Since good gas–liquid contacting is essential for implementation of efficient bubble columns, Assima et al conducted an experimental study to investigate the influence of ship motions on bubbly flow using a hexapod swell simulator and a dual capacitance wire-mesh sensor.…”

Section: Gas–liquid Bubble Columnmentioning

confidence: 99%

“…They are widely exploited especially in chemical processes such as petroleum residues conversion, hydrotreating, Fischer–Tropsch synthesis, coal liquefaction, hydrogenation, wastewater treatment, etc. , Hence, bubble column reactors are also envisaged in offshore fuel processing and gas treatment applications . Since good gas–liquid contacting is essential for implementation of efficient bubble columns, Assima et al conducted an experimental study to investigate the influence of ship motions on bubbly flow using a hexapod swell simulator and a dual capacitance wire-mesh sensor. From gas–liquid visualizations (Figure ), roll, roll + pitch, and high-frequency sway motions were found as the most influential in terms of bubble zigzag and swirl, and bubble-clustering as well as segregation during column dynamic tilts.…”

Section: Gas–liquid Bubble Columnmentioning

confidence: 99%

“…3-D and 2-D Euler representations of gas-rich and liquid-rich presence and gas holdup (α) space-time distribution, respectively, as a function of bubble column (a) roll frequency, (b) roll + pitch frequency, and (c) sway frequency. Adapted with permission from ref . Copyright 2015 Elsevier.…”

Section: Gas–liquid Bubble Columnmentioning

confidence: 99%

See 2 more Smart Citations

110th Anniversary: Marinization of Multiphase Reactors through the Prism of Chemical Engineers

Dashliborun

Zhang

Taghavi

et al. 2019

Ind. Eng. Chem. Res.

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Offshore oil/gas industries have been employing multiphase scrubbers and reactors to treat hydrocarbons extracted from undersea reservoirs. Operation of floating scrubbers and reactors on nonstationary platforms undergoes remarkable technical and operational challenges stemming from the complex sea states. Indeed, ship tilts and motions affect the reactor hydrodynamics and consequently its chemical performance. Therefore, imperatives for predicting and controlling the performance of offshore reactors by accounting for the contribution of marine swells have opened up considerable opportunities for research. This contribution presents an extensive chemical engineering overview on experimental and theoretical studies related to the effect of floating vessel motions on the performance of multiphase reactors and scrubbers. Cocurrent downflow, cocurrent upflow, and countercurrent gas–liquid packed beds, spinning gas–liquid packed beds, gas–solid fluidized bed, and bubble columns are reviewed with an emphasis on their hydrodynamic, mass and heat transfer, mixing behaviors, and their impact on catalytic and noncatalytic reactions for the marine applications.

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Section: Gas–liquid Bubble Columnmentioning

confidence: 99%

Section: Gas–liquid Bubble Columnmentioning

confidence: 99%

See 1 more Smart Citation

110th Anniversary: Marinization of Multiphase Reactors through the Prism of Chemical Engineers

Dashliborun

Zhang

Taghavi

et al. 2019

Ind. Eng. Chem. Res.

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“…Furthermore, the measurement principle of the WMS has also been applied to temperature field measurement by a temperature mesh sensors (Ritterath et al, 2011). In recent years, the research focused on two-phase flow with the WMS technique has been growing (Assima et al, 2015; Kanai et al, 2012; Puchtler et al, 2015; Vieira et al, 2014b; Zhang et al, 2013). As a multi-points measurement technique, WMS not only measures and visualizes local and cross-sectional flow parameters (Abdulahi and Azzopardi, 2014; Barnea et al, 2013; Petritsch et al, 1997), but can also be used for flow process characterization and flow pattern recognition (Monni et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Local characteristic of horizontal air–water two-phase flow by wire-mesh sensor

Liu

Tan

2016

Transactions of the Institute of Measurement and Control

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Two-phase flow widely exists in many industries. Understanding local characteristics of two-phase flow under different flow conditions in piping systems is important to design and optimize the industrial process for higher productivity and lower cost. Air–water two-phase flow experiments were conducted with a 16×16 conductivity wire-mesh sensor (WMS) in a horizontal pipe of a multiphase flow facility. The cross-sectional void fraction time series was analysed by the probability density function (PDF), which described the void fraction fluctuation at different flow conditions. The changes and causes of PDFs during a flow regime transition were analysed. The local structure and flow behaviour were characterized by the local flow spectrum energy analysis and the local void fraction distribution (horizontal, vertical and radial direction) analysis. Finally, three-dimensional transient flow fluctuation energy evolution and characteristic scale distribution based on wavelet analysis of air–water two-phase flow were presented, which revealed the structural features of each phase in two-phase flow.

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“…WMS were also used specifically in gas-liquid two-phase flow investigations. For instance, gas-liquid bubbly flows have been studied in [12,13]; they found that the bubble break-up rate increased with bubble velocity, but the bubble deceleration did not depend on the bubble velocity. For flow pattern studies, the feature-based flow pattern analysis was conducted by using either average phase fraction or local phase fraction [12,14].…”

Section: Introductionmentioning

confidence: 99%

Characterizing the correlations between local phase fractions of gas–liquid two-phase flow with wire-mesh sensor

Tan

Liu

2016

Phil. Trans. R. Soc. A.

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Understanding of flow patterns and their transitions is significant to uncover the flow mechanics of two-phase flow. The local phase distribution and its fluctuations contain rich information regarding the flow structures. A wire-mesh sensor (WMS) was used to study the local phase fluctuations of horizontal gas-liquid two-phase flow, which was verified through comparing the reconstructed three-dimensional flow structure with photographs taken during the experiments. Each crossing point of the WMS is treated as a node, so the measurement on each node is the phase fraction in this local area. An undirected and unweighted flow pattern network was established based on connections that are formed by cross-correlating the time series of each node under different flow patterns. The structure of the flow pattern network reveals the relationship of the phase fluctuations at each node during flow pattern transition, which is then quantified by introducing the topological index of the complex network. The proposed analysis method using the WMS not only provides three-dimensional visualizations of the gas-liquid two-phase flow, but is also a thorough analysis for the structure of flow patterns and the characteristics of flow pattern transition. This article is part of the themed issue 'Supersensing through industrial process tomography'.

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Capacitance wire mesh imaging of bubbly flows for offshore treatment applications

Cited by 13 publications

References 26 publications

110th Anniversary: Marinization of Multiphase Reactors through the Prism of Chemical Engineers

110th Anniversary: Marinization of Multiphase Reactors through the Prism of Chemical Engineers

Local characteristic of horizontal air–water two-phase flow by wire-mesh sensor

Characterizing the correlations between local phase fractions of gas–liquid two-phase flow with wire-mesh sensor

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