Application of dual-plane ERT system and cross-correlation technique to measure gas–liquid flows in vertical upward pipe

Dong, Feng; Xu, Yujia; Xu, Ling-An; Liang, Hua; Qiao, Xiaoyu

doi:10.1016/j.flowmeasinst.2005.02.010

Cited by 54 publications

(19 citation statements)

References 10 publications

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“…For all the tests reported in this section, two 16 electrode titanium rings A and B were used, 30 cm apart, with ring A closer to the injector inlet, as shown in Figure 10. The procedure here reported for estimating velocity was different from those reported in the literature, but, nevertheless, with some similarities with the one described by Dong et al [133]. Instead of using the complete set of EIT projections, the authors only made use of the first projection; first, the potential differences of each pair of the first projection with no marker injection in the flow were acquired, afterwards, they were subtracted to the measured voltage differences obtained during the runs with NaCl injection.…”

Section: Fibre Flow Velocity Estimationcontrasting

confidence: 48%

Electrical Tomography: A Review of Configurations, and Application to Fibre Flow Suspensions Characterisation

et al. 2020

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Understanding the behaviour of suspension flows continues to be a subject of great interest considering its industrial relevance, regardless of the long time and effort dedicated to it by the scientific and industrial communities. Information about several flow characteristics, such as flow regimen, relative velocity between phases, and spatial distribution of the phases, are essential for the development of exact models for description of processes involving pulp suspension. Among the diverse non-invasive techniques for flow characterisation that have been reported in the literature for obtaining experimental data about suspension flow in different processes, Electrical Tomography is one of the most interesting, since it presents perhaps the best compromise among cost, portability, and, above all, safety of handling (indeed there is no need to use radiation, which requires special care when using it). In this paper, a brief review and comparison between existing technologies for pulp suspension flow monitoring will be presented, together with their strengths and weaknesses. Emphasis is given to Electrical Tomography, because it offers the above-mentioned compromise and thus was the strategy adopted by the authors to characterise different flow processes (solid–liquid, liquid–liquid, fibres, etc.). The produced portable EIT system is described, and examples of results of its use for pulp suspension flow characterisation are reported and discussed.

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Section: Fibre Flow Velocity Estimationcontrasting

confidence: 48%

Electrical Tomography: A Review of Configurations, and Application to Fibre Flow Suspensions Characterisation

et al. 2020

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“…Electrical resistance tomography (ERT) is an advanced and non-invasive flow visualization technique which is applicable to opaque fluids and has the capability of performing on-line measurements in different axial and radial locations within the reactor. ERT has been used successfully for gas holdup characterization in several two phase and three phase reactors including bubble column reactors [23][24][25], internal and external loop airlift reactors [26,27], gas-inducing mechanically stirred vessel [28], gas-liquid pipe flows [29,30], and circulating fluidized beds [31,32].…”

Section: Introductionmentioning

confidence: 99%

The use of electrical resistance tomography for the characterization of gas holdup inside a bubble column bioreactor containing activated sludge

Babaei

Bonakdarpour

Ein‐Mozaffari

2015

Chemical Engineering Journal

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“…In the data processing of conventional cross-correlation based on crosssection information measured by ERT system, a feature is usually extracted out of each frame to represent its crosssectional information. Then the two features of both electrode planes are used in cross-correlation calculation [10]. This data pretreatment reduces data dimension efficiently, however, loses the detail information measured by the series of electrodes.…”

Section: Introductionmentioning

confidence: 99%

A measurement method of slug flow velocity of gas-liquid two-phase flow in horizontal pipe

Zhang

Dong

2010

2010 IEEE Instrumentation &Amp; Measurement Technology Conference Proceedings

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Slug flow is an important flow regime of gas/liquid two-phase flow. The parameters measurements of slug flow are of great importance in scientific and engineering field. Local crosscorrelation method is put forward in this paper to make the mixed velocity measurement of slug flow. Different from normal cross-correlation method, this local cross-correlation make direct use of electrode voltage data and gives detail velocity information of the cross-section. According to the electrode distribution in the pipe cross-section, the excitation manners have been sorted into 3 kinds and measured electrodes have been cut into 9 sorts. A static experiment is carried out to testify and concretely analyze the sensitivity difference of different excitation manners and different located measuring electrodes. Results of static experiment verify the above sorting manner and show that different excitation manner and different measured area has its own apparent data feature and. In this local cross correlation method, only selected electrode pairs instead of all electrodes as normal data process participate in excitation process. So the system efficiency has improved, and as a consequence the velocity resolution of cross correlation is improved. The dynamic experiment result shows the efficiency of this local crosscorrelation method and the experiment error is within 10%.

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Application of dual-plane ERT system and cross-correlation technique to measure gas–liquid flows in vertical upward pipe

Cited by 54 publications

References 10 publications

Electrical Tomography: A Review of Configurations, and Application to Fibre Flow Suspensions Characterisation

Electrical Tomography: A Review of Configurations, and Application to Fibre Flow Suspensions Characterisation

The use of electrical resistance tomography for the characterization of gas holdup inside a bubble column bioreactor containing activated sludge

A measurement method of slug flow velocity of gas-liquid two-phase flow in horizontal pipe

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