The design of a dual-plane ERT system for cross correlation measurement of bubbly gas/liquid pipe flow

Deng, Xianmo; Dong, Feng; Xu, Ling-An; Liu, X P; Xu, Lili

doi:10.1088/0957-0233/12/8/306

Cited by 56 publications

(26 citation statements)

References 11 publications

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“…EIT may, therefore, be suitable for numerous aqueous-based processes (York 2001). Using sequences of images obtained from a dual-plane EIT flow sensor, the local flow velocity of the dispersed phase(s) can be deduced based on pixel-pixel cross-correlation methods (Lucas et al 1999, Deng et al 2001, Mosorov et al 2002. This demands an EIT system to have a rapid response time (Wang et al 2005) in order to measure multiphase flows with phase distributions changing in space and time.…”

Section: Introductionmentioning

confidence: 99%

A new visualisation and measurement technology for water continuous multiphase flows

Wang

Jia

Faraj

et al. 2015

Flow Measurement and Instrumentation

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This paper reports the performance of a research prototype of a new multiphase flow instrument to non-invasively measure the phase flow rates, with the capability to rapidly image the flow distributions of two-(solids, gas or oil in water) and three-phase (gas and oil in water) flows. The research prototype is based on the novel concepts of combining vector Electrical Impedance Tomography (EIT) sensor (for measuring dispersed-phase velocity and fraction) with an electromagnetic flow meter (EMF, for measuring continuous-phase velocity with the EIT input) and a gradiomanometer flowmixture density meter (FDM), in addition to on-line water conductivity, temperature and absolute pressure measurements. EIT-EMF-FDM data fusion embedded in the research prototype, including online calibration of reference conductivity and online compensation of conductivity change due to the change of fluids' temperature or ionic concentration, enables the determination of mean concentration, mean velocity and hence the mean flow rate of each individual phase based on the measurement of dispersed-phase distributions and velocity profiles. Results from recent flow-loop experiments at Schlumberger Gould Research (SGR) will be described. The performance of the research prototype in flow-rate measurements are evaluated by comparison with the flow-loop references. The results indicate that optimum performance of the research prototype for three-phase flows is confined within the measuring envelope 45%-100% WLR and 0%-45% GVF, which is the sweet point of the measurement system. Within the scope of this joint research project funded by the UK Engineering & Physical Sciences Research Council (EPSRC), only vertical flows with a conductive continuous liquid phase will be addressed.

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Section: Introductionmentioning

confidence: 99%

A new visualisation and measurement technology for water continuous multiphase flows

Wang

Jia

Faraj

et al. 2015

Flow Measurement and Instrumentation

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“…The flow regime describes the pattern of the inner structure of the flow and important hydrodynamic features such as volume fraction, phase and velocity distributions. Two phase flow regimes are often determined subjectively using direct methods such as the eyeballing method, high speed photography method and the radial attenuation method [12]. Empirical flow regime maps such as the Baker chart [2,34] are commonly used for approximate and rapid identification of the flow regime under specific operating conditions.…”

Section: Classification and Applicationsmentioning

confidence: 99%

Proper Orthogonal Decomposition as a technique for identifying two-phase flow pattern based on electrical impedance tomography

Polanský

Wang

2017

Flow Measurement and Instrumentation

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Collecting very large amount of data from experimental measurement is a common practice in almost every scientific domain. There is a great need to have specific techniques capable of extracting synthetic information, which is essential to understand and model the specific phenomena. The Proper Orthogonal Decomposition (POD) is one of the most powerful data-analysis methods for multivariate and nonlinear phenomena. Generally, POD is a procedure that takes a given collection of input experimental or numerical data and creates an orthogonal basis constituted by functions estimated as the solutions of an integral eigenvalue problem known as a Fredholm equation. By utilising POD to identify flow structure in horizontal pipeline, specially, for slag, plug and wavy stratified air-water flow regimes, this paper proposes a novel approach, in which POD technique extends the current evaluation procedure of electrical impedance tomography applied on air-water flow measurement [32] . This extension is provided by implementation of the POD as an identifier of typical horizontal multiphase flow regimes. The POD snapshot matrices are reconstructed for electrical thomography measurement domain and specific flow conditions. Direct POD method introduced by Lumley and Snapshot POD method introduced by Sirovich are applied. It is expected that this study may provide new knowledge on two phase flow dynamics in a horizontal pipeline and supportive information for further prediction of multiphase flow regime.

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“…At home, in 2001, Tianjin university's research team, led by professor huaxiang wang, developed the TERT -1, 2, 3, 4 type system prototype, under the system of gas liquid two phase flow and oil/water two phase flow in a lot of kinds of experimental research, concluded that ERT acquisition system can realize two phase flow detection and the specific flow pattern identification of two phase flow [9]. In 2007, tianjin university zi qiang cui and others designed a kind of excitation signal source based on the FPGA implementation without touching the hardware circuit, can realize the signal frequency, amplitude, phase Angle, change type, can meet the demand of different data acquisition mode of ERT system.…”

Section: Condition Monitoring and Its Parameters Of Multiphase Flow Mmentioning

confidence: 99%

Application of Electrical Resistance Tomography

Su¹,

Zhao²,

Ren³

et al. 2015

Proceedings of the 4th International Conference on Information Technology and Management Innovation

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Abstract. Electrical tomography technology is a kind of process tomography technology. It is accompanied by the development of computer technology and sensor technology. Electrical resistance tomography is a kind of mode of electrical tomography. It has some excellent characteristics that are non-invasive, portable, low cost and fast response etc. In this paper, the system of ERT unit are introduced. Mainly summarized the application of ERT system in the measurement of multiphase flow, medicine, the concrete structure detection and other aspects.

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The design of a dual-plane ERT system for cross correlation measurement of bubbly gas/liquid pipe flow

Cited by 56 publications

References 11 publications

A new visualisation and measurement technology for water continuous multiphase flows

A new visualisation and measurement technology for water continuous multiphase flows

Proper Orthogonal Decomposition as a technique for identifying two-phase flow pattern based on electrical impedance tomography

Application of Electrical Resistance Tomography

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